diff options
Diffstat (limited to 'c/src/lib/libbsp')
| -rw-r--r-- | c/src/lib/libbsp/sparc/leon3/console/debugputs.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/c/src/lib/libbsp/sparc/leon3/console/debugputs.c b/c/src/lib/libbsp/sparc/leon3/console/debugputs.c index 951218a22c..a189f5b161 100644 --- a/c/src/lib/libbsp/sparc/leon3/console/debugputs.c +++ b/c/src/lib/libbsp/sparc/leon3/console/debugputs.c @@ -33,6 +33,14 @@ static int isinit = 0; int debug_uart_index __attribute__((weak)) = 0; ambapp_apb_uart *dbg_uart = NULL; +/* Before UART driver has registered (or when no UART is available), calls to + * printk that gets to bsp_out_char() will be filling data into the + * pre_printk_dbgbuf[] buffer, hopefully the buffer can help debugging the + * early BSP boot.. At least the last printk() will be caught. + */ +char pre_printk_dbgbuf[32] = {0}; +int pre_printk_pos = 0; + /* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play * for a debug APBUART and enable RX/TX for that UART. */ @@ -122,8 +130,12 @@ int apbuart_inbyte_nonblocking(ambapp_apb_uart *regs) /* putchar/getchar for printk */ static void bsp_out_char(char c) { - if (dbg_uart == NULL) + if (dbg_uart == NULL) { + /* Local debug buffer when UART driver has not registered */ + pre_printk_dbgbuf[pre_printk_pos++] = c; + pre_printk_pos = pre_printk_pos & (sizeof(pre_printk_dbgbuf)-1); return; + } apbuart_outbyte_polled(dbg_uart, c); } |