From: Vadim Bendebury vbendeb@chromium.org
This command is useful to allow to observe messages generated by coreboot and u-boot until present. In particular it is handy when u-boot is instrumented to fall through into console mode on startup errors.
Signed-off-by: Vadim Bendebury vbendeb@chromium.org Signed-off-by: Simon Glass sjg@chromium.org --- drivers/misc/cbmem_console.c | 26 ++++++++++++++++++++++++++ 1 files changed, 26 insertions(+), 0 deletions(-)
diff --git a/drivers/misc/cbmem_console.c b/drivers/misc/cbmem_console.c index 80a84fd..35c3cb1 100644 --- a/drivers/misc/cbmem_console.c +++ b/drivers/misc/cbmem_console.c @@ -31,10 +31,19 @@ struct cbmem_console {
static struct cbmem_console *cbmem_console_p;
+/* + * Need to be able to avoid adding charactes to cbmem console buffer while its + * contents are being dumped. + */ +static int suppress_cbmem_console; + void cbmemc_putc(char data) { int cursor;
+ if (suppress_cbmem_console) + return; + cursor = cbmem_console_p->buffer_cursor++; if (cursor < cbmem_console_p->buffer_size) cbmem_console_p->buffer_body[cursor] = data; @@ -65,3 +74,20 @@ int cbmemc_init(void)
return (rc == 0) ? 1 : rc; } + +static int +do_cbc_dump(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) +{ + int cursor = 0; + + suppress_cbmem_console = 1; + + while (cursor < cbmem_console_p->buffer_cursor) + putc(cbmem_console_p->buffer_body[cursor++]); + + suppress_cbmem_console = 0; + return 0; +} + +U_BOOT_CMD(cbc_dump, 1, 1, do_cbc_dump, + "dump CBMEM console buffer to serial port", NULL);