path: root/main/common/xmodem.c

/**************************************************************************
 *
 * Copyright (c) 2013 Alcatel-Lucent
 *
 * Alcatel Lucent licenses this file to You under the Apache License,
 * Version 2.0 (the "License"); you may not use this file except in
 * compliance with the License.  A copy of the License is contained the
 * file LICENSE at the top level of this repository.
 * You may also obtain a copy of the License at:
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 *
 **************************************************************************
 *
 * xmodem.c:
 *
 * Command to upload or download via XMODEM protocol.  Xmodem is quite
 * limited, but adequate for simple file up/down load.
 * This also supports XMODEM-1K and YMODEM.  YMODEM is an extension to XMODEM
 * that uses a 1K packet size, CRC and the first packet (seqno=0) contains
 * information about the file being downloaded (in partiuclar, the name).
 * YMODEM also supports BATCH downloads (multiple files downloaded in one
 * transaction).  This code supports incoming BATCH downloads (not tested
 * because I can't find any terminal emulators that do it), but not for
 * uploads.

 * Minicom notes:
 * Minicom is the terminal emulation program that comes with Linux.
 * For some reason I had to make some adjustments to the xmodem.c
 * to accommodate Minicom...
 * - Minicom sends an initial 0x1a (EOF). Not sure why, so I just absorb
 *   that now.
 * - Minicom doesn't like a fast nak-resend rate, so each additional
 *   'd' option on the xmodem command line now causes the delay
 *   between outgoing NAKs (used to start up the protocol in Xdown())
 *   to double.  As a result, when running with minicom, a file download
 *   may need "xmodem -ddd".  Not exactly sure why this is necessary but
 *   here's my hunch...
 *   To do an xmodem transfer to the target running uMon, the "xmodem -d"
 *   command is issued on the uMon command line.  This causes uMon to start
 *   generating periodic NAKs (part of the xmodem startup handshake).
 *   Then via CTRL-A Z, the minicom side of the transaction starts up.
 *   Apparently, minicom doesn't flush the input buffer when the xmodem
 *   transfer is started on its side.  As a result there may be several
 *   NAKs buffered up on the TTY.  The end result is that if too many
 *   NAKs have been queued up in the TTY's buffer, Minicom chokes on
 *   them at startup.
 *   Adding the ability to slow down the NAK send rate keeps uMon from
 *   sending too many NAKs prior to Minicom actually starting up its
 *   side of the protocol; hence, Minicom doesn't choke and the transfer
 *   works ok.
 *
 *   By default, this code will disable the ethernet interface
 *   during the xmodem transaction.  This is done because in most
 *   cases the monitor runs with no flow control; and getchar polls
 *   the ethernet interface.  If the poll results in an incoming
 *   packet, then it may cause the serial port to lose characters.
 *   If this is not desireable (or if the uart has a large input fifo),
 *   then this can be changed with the DONT_DISABLE_ENET_IN_XMODEM
 *   #define set up in config.h
 *
 * Original author:     Ed Sutter (ed.sutter@alcatel-lucent.com)
 *
 */
#include "config.h"
#include "genlib.h"
#include "stddefs.h"
#include "flash.h"
#include "tfs.h"
#include "tfsprivate.h"
#include "cli.h"
#include "ether.h"
#include "timer.h"

#if INCLUDE_XMODEM

#define PUTCHAR putchar


/* struct xinfo:
 * Used to contain information pertaining to the current transaction.
 * The structure is built by the command Xmodem, then passed to the other
 * support functions (Xup, Xdown, etc..) for reference and update.
 */
struct xinfo {
    uchar   sno;            /* Sequence number. */
    uchar   pad;            /* Unused, padding. */
    int     xfertot;        /* Running total of transfer. */
    int     pktlen;         /* Length of packet (128 or 1024). */
    int     pktcnt;         /* Running tally of number of packets processed. */
    int     filcnt;         /* Number of files transferred by ymodem. */
    long    size;           /* Size of upload. */
    ulong   flags;          /* Storage for various runtime flags. */
    ulong   base;           /* Starting address for data transfer. */
    ulong   dataddr;        /* Running address for data transfer. */
    int     errcnt;         /* Keep track of errors (used in verify mode). */
    int     nakresend;      /* Time between each NAK sent at Xdown startup. */
    char    *firsterrat;    /* Pointer to location of error detected when */
    /* transfer is in verify mode. */
    char    fname[TFSNAMESIZE];
};

/* Runtime flags: */
#define USECRC  (1<<0)
#define VERIFY  (1<<1)
#define YMODEM  (1<<2)

/* Current xmodem operation: */
#define XNULL   0
#define XUP     1
#define XDOWN   2

/* X/Ymodem protocol: */
#define SOH     0x01
#define STX     0x02
#define EOT     0x04
#define ACK     0x06
#define NAK     0x15
#define CAN     0x18
#define EOF     0x1a
#define ESC     0x1b

#define PKTLEN_128  128
#define PKTLEN_1K   1024

#define BYTE_TIMEOUT    1000

static int Xup(struct xinfo *);
static int Xdown(struct xinfo *);
static int getPacket(uchar *,struct xinfo *);
static int putPacket(uchar *,struct xinfo *);

char *XmodemHelp[] = {
    "Xmodem file transfer",
    "-[a:BcdF:f:i:ks:uvy]",
#if INCLUDE_VERBOSEHELP
    "Options:",
    " -a{##}     address (overrides default of APPRAMBASE)",
#if INCLUDE_FLASH
    " -B         boot sector reload",
#endif
    " -c         use crc (default = checksum)",
    " -d         download",
#if INCLUDE_TFS
    " -F{name}   filename",
    " -f{flags}  file flags (see tfs)",
    " -i{info}   file info (see tfs)",
#endif
    " -k         force packet length to 1K",
    " -s{##}     size (overrides computed size)",
    " -u         upload",
    " -v         verify only",
#if INCLUDE_TFS
    " -y         use Ymodem extensions",
#endif
    "Notes:",
    " * Either -d or -u must be specified (-B implies -d).",
    " * Each additional 'd' option cuts the nak-resend rate in half.",
    " * XMODEM forces a 128-byte modulo on file size.  The -s option",
    "   can be used to override this when transferring a file to TFS.",
    " * File upload requires no address or size (size will be mod 128).",
    " * When using -B, it should be the ONLY command line option,",
    "   it's purpose is to reprogram the boot sector, so be careful!",
#endif
    (char *)0,
};

int
Xmodem(int argc,char *argv[])
{
    int opt, xop;
    struct  xinfo xi;
#if INCLUDE_TFS
    char    *info = (char *)0;
    char    *flags = (char *)0;
    TFILE   *tfp;
#endif
#if INCLUDE_FLASH
    int newboot = 0;
#endif
#if INCLUDE_ETHERNET
    int eon;
#endif

    xop = XNULL;
    xi.fname[0] = 0;
    xi.size = 0;
    xi.flags = 0;
    xi.filcnt = 0;
    xi.nakresend = 2;
    xi.pktlen = PKTLEN_128;
    xi.base = xi.dataddr = getAppRamStart();
    while((opt=getopt(argc,argv,"a:BcdF:f:i:ks:uvy")) != -1) {
        switch(opt) {
        case 'a':
            xi.dataddr = xi.base = strtoul(optarg,(char **)0,0);
            break;
        case 'B':
            xop = XDOWN;
#if INCLUDE_FLASH
            newboot = 1;
#endif
            break;
        case 'c':
            xi.flags |= USECRC;
            break;
        case 'd':
            xi.nakresend *= 2;      /* -ddd increases Xdown() resend delay */
            xop = XDOWN;
            break;
#if INCLUDE_TFS
        case 'F':
            strncpy(xi.fname,optarg,TFSNAMESIZE);
            break;
        case 'f':
            flags = optarg;
            break;
        case 'i':
            info = optarg;
            break;
#endif
        case 'k':
            xi.pktlen = PKTLEN_1K;
            break;
        case 's':
            xi.size = strtol(optarg,(char **)0,0);
            break;
        case 'u':
            xop = XUP;
            break;
        case 'v':
            xi.flags |= VERIFY;
            break;
#if INCLUDE_TFS
        case 'y':
            xi.flags |= (YMODEM | USECRC);
            xi.pktlen = PKTLEN_1K;
            break;
#endif
        default:
            return(CMD_PARAM_ERROR);
        }
    }

    /* There should be no arguments after the option list. */
    if(argc != optind) {
        return(CMD_PARAM_ERROR);
    }

    if(xop == XUP) {
        if((xi.flags & YMODEM) && !(xi.fname[0])) {
            printf("Ymodem upload needs filename\n");
        } else {
            if(xi.fname[0]) {   /* Causes -a and -s options to be ignored. */
#if INCLUDE_TFS
                tfp = tfsstat(xi.fname);
                if(!tfp) {
                    printf("%s: file not found\n",xi.fname);
                    return(CMD_FAILURE);
                }
                xi.base = xi.dataddr = (ulong)TFS_BASE(tfp);
                xi.size = TFS_SIZE(tfp);
#endif
            }
#ifdef DONT_DISABLE_ENET_IN_XMODEM      /* See note at top of file */
            Xup(&xi);
#else
#if INCLUDE_ETHERNET
            eon = DisableEthernet();
#endif
            Xup(&xi);
#if INCLUDE_ETHERNET
            if(eon) {
                EthernetStartup(0,0);
            }
#endif
#endif
        }
    } else if(xop == XDOWN) {
        long    tmpsize;

        if((xi.flags & YMODEM) && (xi.fname[0]))
            printf("Ymodem download gets name from protocol, '%s' ignored\n",
                   xi.fname);

#ifdef DONT_DISABLE_ENET_IN_XMODEM      /* See note at top of file */
        tmpsize = (long)Xdown(&xi);
#else
#if INCLUDE_ETHERNET
        eon = DisableEthernet();
#endif
        tmpsize = (long)Xdown(&xi);
#if INCLUDE_ETHERNET
        if(eon) {
            EthernetStartup(0,0);
        }
#endif
#endif
        if(tmpsize == -1) {
            return(CMD_FAILURE);
        }
        if((!xi.size) || (tmpsize < 0)) {
            xi.size = tmpsize;
        }

#if INCLUDE_TFS
        if((xi.fname[0]) && (xi.size > 0)) {
            int err;

            printf("Writing to file '%s'...\n",xi.fname);
            err = tfsadd(xi.fname,info,flags,(uchar *)xi.base,xi.size);
            if(err != TFS_OKAY) {
                printf("%s: %s\n",xi.fname,(char *)tfsctrl(TFS_ERRMSG,err,0));
                return(CMD_FAILURE);
            }
        }
#if INCLUDE_FLASH
        else
#endif
#endif
#if INCLUDE_FLASH
            if((newboot) && (xi.size > 0)) {
                extern  int FlashProtectWindow;
                int     rc;
                char    *bb;
                ulong   bootbase;

                bb = getenv("BOOTROMBASE");
                if(bb) {
                    bootbase = strtoul(bb,0,0);
                } else {
                    bootbase = BOOTROM_BASE;
                }
#ifdef TO_FLASH_ADDR
                /* The address the program is linked to is not necessarily the
                 * physical address where flash operations can be performed on.
                 * A typical use could be that the program is linked to run in
                 * a cacheable region but writing to the flash can only be done
                 * in an uncached region.
                 * "config.h" is a good place to define the TO_FLASH_ADDR macro.
                 */
                bootbase = (ulong)TO_FLASH_ADDR(bootbase);
#endif
                printf("Reprogramming boot @ 0x%lx from 0x%lx, %ld bytes.\n",
                       bootbase,xi.base,xi.size);
                if(askuser("OK?")) {
                    int first, last;

                    /* If sector(s) need to be unlocked, do that now...
                     */
                    if(addrtosector((uchar *)bootbase,&first,0,0) == -1) {
                        return(CMD_FAILURE);
                    }

                    if(addrtosector((uchar *)bootbase+xi.size-1,&last,0,0) == -1) {
                        return(CMD_FAILURE);
                    }

                    if(flashlock(first,FLASH_LOCKABLE) != -1) {
                        FlashProtectWindow = 1;
                        while(first < last) {
                            flashlock(first++,FLASH_UNLOCK);
                        }
                    }

                    FlashProtectWindow = 1;
                    rc = flashewrite((uchar *)bootbase,(uchar *)xi.base,xi.size);
                    if(rc == -1) {
                        printf("failed\n");
                        return(CMD_FAILURE);
                    }
                }
            }
#endif
    } else {
        return(CMD_PARAM_ERROR);
    }
    shell_sprintf("XMODEMGET","%ld",xi.size);
    return(CMD_SUCCESS);
}

/* xgetchar():
 * Wrap getchar with a timer, so that after 5 seconds of waiting
 * we giveup...
 */
int
xgetchar(char *cp, int lno)
{
    struct  elapsed_tmr tmr;

    startElapsedTimer(&tmr,5000);
    while(!msecElapsed(&tmr) && !gotachar());
    if(!gotachar()) {
        Mtrace("Xgetchar tmt %d",lno);
        return(-1);
    }
    *cp = getchar();
    return(0);
}

/* putPacket():
 * Used by Xup to send packets.
 */
static int
putPacket(uchar *tmppkt, struct xinfo *xip)
{
    char    c;
    int     i;
    ushort  chksm;

    chksm = 0;

    if(xip->pktlen == PKTLEN_128) {
        PUTCHAR(SOH);
    } else {
        PUTCHAR(STX);
    }

    PUTCHAR((char)(xip->sno));
    PUTCHAR((char)~(xip->sno));

    if(xip->flags & USECRC) {
        for(i=0; i<xip->pktlen; i++) {
            PUTCHAR((char)*tmppkt);
            chksm = (chksm<<8)^xcrc16tab[(chksm>>8)^*tmppkt++];
        }
        /* An "endian independent way to extract the CRC bytes. */
        PUTCHAR((char)(chksm >> 8));
        PUTCHAR((char)chksm);
    } else {
        for(i=0; i<xip->pktlen; i++) {
            PUTCHAR((char)*tmppkt);
            chksm = ((chksm+*tmppkt++)&0xff);
        }
        PUTCHAR((char)(chksm&0x00ff));
    }

    if(xgetchar(&c,__LINE__) == -1) {           /* Wait for ack */
        return(-1);
    }

    /* If pktcnt == -1, then this is the first packet sent by
     * YMODEM (filename) and we must wait for one additional
     * character in the response.
     */
    if(xip->pktcnt == -1) {
        if(xgetchar(&c,__LINE__) == -1) {
            return(-1);
        }
    }
    return((int)c);
}

/* getPacket():
 * Used by Xdown to retrieve packets.
 */
static int
getPacket(uchar *tmppkt, struct xinfo *xip)
{
    char    *pkt;
    int     i,rcvd;
    uchar   seq[2];

    if((rcvd = getbytes_t((char *)seq,2,BYTE_TIMEOUT)) != 2) {
        PUTCHAR(NAK);
        Mtrace("RCVD %d != 2",rcvd);
        return(0);
    }

    if(xip->flags & VERIFY) {
        rcvd = getbytes_t((char *)tmppkt,xip->pktlen,BYTE_TIMEOUT);
        if(rcvd != xip->pktlen) {
            PUTCHAR(NAK);
            Mtrace("RCVD %d != %d",rcvd,xip->pktlen);
            return(0);
        }
        for(i=0; i<xip->pktlen; i++) {
            if(tmppkt[i] != ((char *)xip->dataddr)[i]) {
                if(xip->errcnt++ == 0) {
                    xip->firsterrat = (char *)(xip->dataddr+i);
                }
            }
        }
        pkt = (char *)tmppkt;
    } else {
        rcvd = getbytes_t((char *)xip->dataddr,xip->pktlen,BYTE_TIMEOUT);
        if(rcvd != xip->pktlen) {
            PUTCHAR(NAK);
            Mtrace("RCVD %d != %d",rcvd,xip->pktlen);
            return(0);
        }
        pkt = (char *)xip->dataddr;
    }

    if(xip->flags & USECRC) {
        char c;
        ushort  crc, xcrc;

        /* An "endian independent way to combine the CRC bytes. */
        if(xgetchar(&c,__LINE__) == -1) {
            return(0);
        }
        crc = (ushort)c;
        crc <<= 8;
        if(xgetchar(&c,__LINE__) == -1) {
            return(0);
        }
        crc += (ushort)c;
        xcrc = xcrc16((uchar *)pkt,(ulong)(xip->pktlen));
        if(crc != xcrc) {
            PUTCHAR(NAK);
            Mtrace("CRC %04x != %04x",crc,xcrc);
            return(0);
        }
    } else {
        uchar   csum, xcsum;

        if(xgetchar((char *)&xcsum,__LINE__) == -1) {
            return(0);
        }
        csum = 0;
        for(i=0; i<xip->pktlen; i++) {
            csum += *pkt++;
        }
        if(csum != xcsum) {
            PUTCHAR(NAK);
            Mtrace("CSUM %02x != %02x (%d)",csum,xcsum,xip->pktlen);
            return(0);
        }
        Mtrace("CSUM %02x (%d)",csum,xip->pktlen);
    }

    /* Test the sequence number compliment...
     */
    if((uchar)seq[0] != (uchar)~seq[1]) {
        PUTCHAR(NAK);
        Mtrace("SNOCMP %02x != %02x",(uchar)seq[0],(uchar)~(seq[1]));
        return(0);
    }

    /* Verify that the incoming sequence number is the expected value...
     */
    if((uchar)seq[0] !=  xip->sno) {
        /* If the incoming sequence number is one less than the expected
         * sequence number, then we assume that the sender did not recieve
         * our previous ACK, and they are resending the previously received
         * packet.  In that case, we send  ACK and don't process the
         * incoming packet...
         */
        if((uchar)seq[0] == xip->sno-1) {
            Mtrace("R_ACK");
            PUTCHAR(ACK);
            return(0);
        }

        /* Otherwise, something's messed up...
         */
        PUTCHAR(CAN);
        Mtrace("SNO: %02x != %02x",seq[0],xip->sno);
        return(-1);
    }

    /* First packet of YMODEM contains information about the transfer:
     * FILENAME SP FILESIZE SP MOD_DATE SP FILEMODE SP FILE_SNO
     * Only the FILENAME is required and if others are present, then none
     * can be skipped.
     */
    if((xip->flags & YMODEM) && (xip->pktcnt == 0)) {
        char *slash, *space, *fname;

        slash = strrchr((char *)(xip->dataddr),'/');
        space = strchr((char *)(xip->dataddr),' ');
        if(slash) {
            fname = slash+1;
        } else {
            fname = (char *)(xip->dataddr);
        }
        Mtrace("<fname=%s>",fname);
        if(space) {
            *space = 0;
            xip->size = atoi(space+1);
        }
        strcpy(xip->fname,fname);
        if(fname[0]) {
            xip->filcnt++;
        }
    } else {
        xip->dataddr += xip->pktlen;
    }
    xip->sno++;
    xip->pktcnt++;
    xip->xfertot += xip->pktlen;
    Mtrace("ACK");
    PUTCHAR(ACK);
    if(xip->flags & YMODEM) {
        if(xip->fname[0] == 0) {
            printf("\nRcvd %d file%c\n",
                   xip->filcnt,xip->filcnt > 1 ? 's' : ' ');
            return(1);
        }
    }
    return(0);
}

/* Xup():
 * Called when a transfer from target to host is being made (considered
 * an upload).
 */
static int
Xup(struct xinfo *xip)
{
    uchar   c, buf[PKTLEN_128];
    int     tmp, done, pktlen;

    Mtrace("Xup starting");

    if(xip->size & 0x7f) {
        xip->size += 128;
        xip->size &= 0xffffff80L;
    }

    printf("Upload %ld bytes from 0x%lx\n",xip->size,(ulong)xip->base);

    /* Startup synchronization... */
    /* Wait to receive a NAK or 'C' from receiver. */
    done = 0;
    while(!done) {
        if(xgetchar((char *)&c,__LINE__) == -1) {
            return(0);
        }
        switch(c) {
        case NAK:
            done = 1;
            Mtrace("CSM");
            break;
        case 'C':
            xip->flags |= USECRC;
            done = 1;
            Mtrace("CRC");
            break;
        case 'q':   /* ELS addition, not part of XMODEM spec. */
            return(0);
        default:
            break;
        }
    }

    rawon();

    if(xip->flags & YMODEM) {
        Mtrace("SNO_0");
        xip->sno = 0;
        xip->pktcnt = -1;
        memset((char *)buf,0,PKTLEN_128);
        sprintf((char *)buf,"%s",xip->fname);
        pktlen = xip->pktlen;
        xip->pktlen = PKTLEN_128;
        if(putPacket(buf,xip) == -1) {
            return(0);
        }
        xip->pktlen = pktlen;
    }

    done = 0;
    xip->sno = 1;
    xip->pktcnt = 0;
    while(!done) {
        if((tmp = putPacket((uchar *)(xip->dataddr),xip)) == -1) {
            return(0);
        }
        c = (uchar)tmp;
        switch(c) {
        case ACK:
            xip->sno++;
            xip->pktcnt++;
            xip->size -= xip->pktlen;
            xip->dataddr += xip->pktlen;
            Mtrace("A");
            break;
        case NAK:
            Mtrace("N");
            break;
        case CAN:
            done = -1;
            Mtrace("C");
            break;
        case EOT:
            done = -1;
            Mtrace("E");
            break;
        default:
            done = -1;
            Mtrace("<%02x>",c);
            break;
        }
        if(xip->size <= 0) {
            char tmp;

            PUTCHAR(EOT);
            if(xgetchar(&tmp,__LINE__) == -1) { /* Flush the ACK */
                return(0);
            }
            break;
        }
        Mtrace("!");
    }

    Mtrace("Xup_almost");
    if((done != -1) && (xip->flags & YMODEM)) {
        xip->sno = 0;
        memset((char *)buf,0,PKTLEN_128);
        pktlen = xip->pktlen;
        xip->pktlen = PKTLEN_128;
        if(putPacket(buf,xip) == -1) {
            return(0);
        }
        xip->pktlen = pktlen;
    }
    Mtrace("Xup_done.");
    rawoff();
    return(0);
}


/* Xdown():
 * Called when a transfer from host to target is being made (considered
 * an download).
 * Note that if we don't have INCLUDE_MALLOC set (in config.h), then
 * we allocate a 128-byte static buffer and only support the 128-byte
 * packet size here.
 */

static int
Xdown(struct xinfo *xip)
{
    struct  elapsed_tmr tmr;
    char    c, *tmppkt;
    int     i, done;
#if !INCLUDE_MALLOC
    static char pkt[PKTLEN_128];

    tmppkt = pkt;
#else
    tmppkt = malloc(PKTLEN_1K);
    if(!tmppkt) {
        Mtrace("malloc failed");
        return(-1);
    }
#endif

    rawon();

nextfile:
    if(xip->flags & YMODEM) {
        xip->sno = 0x00;
    } else {
        xip->sno = 0x01;
    }
    xip->pktcnt = 0;
    xip->errcnt = 0;
    xip->xfertot = 0;
    xip->firsterrat = 0;

    /* Startup synchronization... */
    /* Continuously send NAK or 'C' until sender responds. */
restart:
    Mtrace("Xdown");
    for(i=0; i<32; i++) {
        if(xip->flags & USECRC) {
            PUTCHAR('C');
        } else {
            PUTCHAR(NAK);
        }

        startElapsedTimer(&tmr,xip->nakresend * 1000);
        while(!msecElapsed(&tmr) && !gotachar());
        if(gotachar()) {
            break;
        }
    }
    if(i == 32) {
        Mtrace("Giveup @ %d",__LINE__);
        return(-1);
    }

    done = 0;
    Mtrace("Got response");
    while(done == 0) {
        if(xgetchar(&c,__LINE__) == -1) {
            return(-1);
        }
        switch(c) {
        case SOH:               /* 128-byte incoming packet */
            Mtrace("O");
            xip->pktlen = 128;
            done = getPacket((uchar *)tmppkt,xip);
            if(done < 0) {
                Mtrace("GP_%d",done);
            }
            if(!done && (xip->pktcnt == 1) && (xip->flags & YMODEM)) {
                goto restart;
            }
            break;
#if INCLUDE_MALLOC
        case STX:               /* 1024-byte incoming packet */
            Mtrace("T");
            xip->pktlen = 1024;
            done = getPacket((uchar *)tmppkt,xip);
            if(done < 0) {
                Mtrace("GP_%d",done);
            }
            if(!done && (xip->pktcnt == 1) && (xip->flags & YMODEM)) {
                goto restart;
            }
            break;
#endif
        case CAN:
            Mtrace("C");
            done = -1;
            break;
        case EOT:
            Mtrace("E");
            PUTCHAR(ACK);
            if(xip->flags & YMODEM) {
#if INCLUDE_TFS
                if(!xip->size) {
                    xip->size = xip->pktcnt * xip->pktlen;
                }
                if(xip->fname[0]) {
                    tfsadd(xip->fname,0,0,(uchar *)xip->base,xip->size);
                }
                xip->dataddr = xip->base;
#endif
                goto nextfile;
            } else {
                done = xip->xfertot;
                rawoff();
                printf("\nRcvd %d pkt%c (%d bytes)\n",xip->pktcnt,
                       xip->pktcnt > 1 ? 's' : ' ',xip->xfertot);

                /* If the transfer is complete and no file add is to
                 * be done, then we flush d-cache and invalidate
                 * i-cache across the memory space that was just
                 * copied to.  This is necessary in case the
                 * binary data that was just transferred is code.
                 */
                flushDcache((char *)xip->base,xip->xfertot);
                invalidateIcache((char *)xip->base,xip->xfertot);
            }
            break;
        case ESC:       /* User-invoked abort */
            Mtrace("X");
            done = -1;
            break;
        case EOF:       /* 0x1a sent by MiniCom, just ignore it. */
            break;
        default:
            Mtrace("<%02x>",c);
            done = -1;
            break;
        }
        Mtrace("!");
    }
    rawoff();
    if(xip->flags & VERIFY) {
        if(xip->errcnt)
            printf("%d errors, first at 0x%lx\n",
                   xip->errcnt,(ulong)(xip->firsterrat));
        else {
            printf("verification passed\n");
        }
    }
    free(tmppkt);
    return(done);
}


#endif