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LEON3: debugputs added printk mem buffer when no UART present

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Signed-off-by: Daniel Hellstrom <daniel@gaisler.com>
This commit is contained in:
Daniel Hellstrom
2012-04-19 15:21:23 +02:00
committed by Gedare Bloom
parent 62694fd68f
commit 5903484a29
1 changed files with 13 additions and 1 deletions
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14
c/src/lib/libbsp/sparc/leon3/console/debugputs.c
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@@ -33,6 +33,14 @@ static int isinit = 0;
int debug_uart_index __attribute__((weak)) = 0; int debug_uart_index __attribute__((weak)) = 0;
ambapp_apb_uart *dbg_uart = NULL; 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 /* Initialize the BSP system debug console layer. It will scan AMBA Plu&Play
* for a debug APBUART and enable RX/TX for that UART. * 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 */ /* putchar/getchar for printk */
static void bsp_out_char(char c) 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; return;
}
apbuart_outbyte_polled(dbg_uart, c); apbuart_outbyte_polled(dbg_uart, c);
} }