blob: 38523385b4f81cd52aee076183526dced779441b (
plain) (
tree)
|
|
#
# $Id$
#
BSP NAME: helas403
BOARD: IMD, helas-ppc
BUS: N/A
CPU FAMILY: ppc
CPU: PowerPC 403GA
COPROCESSORS: N/A
MODE: 32 bit mode
DEBUG MONITOR: Modified Motorola FBUG
PERIPHERALS
===========
TIMERS: 403GA internal
RESOLUTION: .04 microseconds
SERIAL PORTS: 403GA internal
REAL-TIME CLOCK: 403GA internal
DMA: 403GA internal
VIDEO: none
SCSI: none
NETWORKING: none
DRIVER INFORMATION
==================
CLOCK DRIVER: 403GA internal
IOSUPP DRIVER: N/A
SHMSUPP: N/A
TIMER DRIVER: 403GA internal
TTY DRIVER: 403GA internal
STDIO
=====
PORT: Console port 0
ELECTRICAL: RS-232
BAUD: 9600
BITS PER CHARACTER: 8
PARITY: None
STOP BITS: 1
Notes
=====
Board description
-----------------
clock rate: 25 MHz
bus width: 8-bit PROM, 32-bit DRAM
ROM: Up to 512KByte (Am29F040), 90 nsec chip select 0
RAM: 4 to 32 MByte DRAM SIMM (autodetect), 70 nsec,
no parity, at CS7 or CS6+CS7 (for two-bank-SIMMs)
helas403 only supports single processor operations.
Porting
-------
This board support package is written for a typical PPC403GA
system. The rough features of this board are described above.
This BSP contains files for two startup methods:
- Direct start from Flash after powerup (with code run out of flash):
This is the default configuration, it uses the files
flashentry/flashentry.s
startup/linkcmds
Please note, that this configuration is good to startup the system,
but it will not gain maximum performance due to slow Flash access (8
bit wide only)
- Start after software download into DRAM:
This configuration will use:
dlentry/dlentry.s
startup/linkcmds.dl
If you want to use the download configuration, it is sufficient to
rename the file "startup/linkcmds.dl" to "startup/linkcmds", it will
automatically reference the dlentry.s as entry code. (Renaming is not
quite elegant, a more sophisticated solution will follow in future,
any hints welcome ;-)
For adapting this BSP to other boards, the following files should be
modified:
- c/src/lib/libbsp/powerpc/helas403/flashentry/flashentry.s
for the memory controller configuration and other basic stuff
- c/src/lib/libbsp/powerpc/helas403/startup/linkcmds[.dl]
for the memory layout required
- c/src/lib/libbsp/powerpc/helas403/startup/bspstart.c
for adaption of BSP_Configuration. here you can select
the clock source for the timers and the serial interface
(system clock or external clock pin), the clock rates, initial
baud rate and other stuff
- c/src/lib/libbsp/powerpc/helas403/include/bsp.h
some BSP-related constants
The actual drivers are placed in
- c/src/lib/libcpu/powerpc/ppc403/*
well, they should be generic, so there _should_ be no reason
to mess around there (but who knows...)
|
