erebion/coreboot
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console: Add console for GDB

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Connection of UARTs to GDB stub got lost in the console transition
process, bring it back. In theory, GDB stub should work also over
usbdebug, but that solution is not really tested at all yet.

Change-Id: I90e05e8132889e788b92e055ee191f35add43bbc
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5343
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <patrick@georgi-clan.de>
This commit is contained in:
Kyösti Mälkki 2014-04-04 15:05:28 +03:00
commit f2f7f03aff
6 changed files with 64 additions and 4 deletions
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1
src/arch/x86/lib/c_start.S
View file

@ -86,6 +86,7 @@ _start:
post_code(POST_PRE_HARDWAREMAIN) /* post fe */
#if CONFIG_GDB_WAIT
call gdb_hw_init
call gdb_stub_breakpoint
#endif
call main

13
src/arch/x86/lib/exception.c
View file

@ -1,4 +1,5 @@
#include <console/console.h>
#include <console/streams.h>
#include <string.h>
#if CONFIG_GDB_STUB
@ -217,12 +218,17 @@ static char out_buffer[BUFMAX];
static inline void stub_putc(int ch)
{
console_tx_byte(ch);
gdb_tx_byte(ch);
}
static inline void stub_flush(void)
{
gdb_tx_flush();
}
static inline int stub_getc(void)
{
return console_rx_byte();
return gdb_rx_byte();
}
static int hex(char ch)
@ -322,9 +328,11 @@ static int get_packet(char *buffer)
if (checksum != xmitcsum) {
stub_putc('-'); /* failed checksum */
stub_flush();
}
else {
stub_putc('+'); /* successful transfer */
stub_flush();
}
}
} while(checksum != xmitcsum);
@ -353,6 +361,7 @@ static void put_packet(char *buffer)
stub_putc('#');
stub_putc(hexchars[checksum >> 4]);
stub_putc(hexchars[checksum % 16]);
stub_flush();
} while ((stub_getc() & 0x7f) != '+');