This is just a draft to discuss ideas related to "Make U-Boot log great again" thread.

With this patch we will have something like this:

Attempting to load environment from FAT: -> MMC: no card present -> ** Bad device mmc 0 ** -> Failed (-5) Attempting to load environment from MMC: OK

instead of this:

Loading Environment from FAT... MMC: no card present ** Bad device mmc 0 ** Failed (-5) Loading Environment from MMC... OK

Two things were done in this patch: - print messages from drivers in nested style (with "->" prefix); to do so, add GD_FLG_PR_PREFIX flag and check it in puts() - make "OK" to be printed on the same line as main message; to do so, issue ASCII escape codes [1] to move cursor back to main message line

[1] https://en.wikipedia.org/wiki/ANSI_escape_code#CSI_sequences

Signed-off-by: Sam Protsenko semen.protsenko@linaro.org --- common/console.c | 6 ++++++ env/env.c | 17 +++++++++++++---- include/asm-generic/global_data.h | 1 + 3 files changed, 20 insertions(+), 4 deletions(-)

diff --git a/common/console.c b/common/console.c index 2ba33dc574..a0db0ffea6 100644 --- a/common/console.c +++ b/common/console.c @@ -533,6 +533,12 @@ void putc(const char c)

void puts(const char *s) { + if (gd->flags & GD_FLG_PR_PREFIX) { + gd->flags &= ~GD_FLG_PR_PREFIX; + puts(" -> "); + gd->flags |= GD_FLG_PR_PREFIX; + } + #ifdef CONFIG_DEBUG_UART if (!gd || !(gd->flags & GD_FLG_SERIAL_READY)) { while (*s) { diff --git a/env/env.c b/env/env.c index 5c0842ac07..ff044ccee1 100644 --- a/env/env.c +++ b/env/env.c @@ -187,6 +187,7 @@ int env_load(void)

for (prio = 0; (drv = env_driver_lookup(ENVOP_LOAD, prio)); prio++) { int ret; + char msg[75];

if (!drv->load) continue; @@ -194,12 +195,20 @@ int env_load(void) if (!env_has_inited(drv->location)) continue;

- printf("Loading Environment from %s... ", drv->name); + snprintf(msg, 75, "Attempting to load environment from %s:\n", + drv->name); + puts(msg); + gd->flags |= GD_FLG_PR_PREFIX; ret = drv->load(); - if (ret) + if (ret) { printf("Failed (%d)\n", ret); - else - printf("OK\n"); + gd->flags &= ~GD_FLG_PR_PREFIX; + } else { + size_t len = strlen(msg); + + gd->flags &= ~GD_FLG_PR_PREFIX; + printf("\033[1A\033[%zuC OK\n", len - 1); + }

if (!ret) return 0; diff --git a/include/asm-generic/global_data.h b/include/asm-generic/global_data.h index 0fd4900392..7e83617664 100644 --- a/include/asm-generic/global_data.h +++ b/include/asm-generic/global_data.h @@ -150,5 +150,6 @@ typedef struct global_data { #define GD_FLG_ENV_DEFAULT 0x02000 /* Default variable flag */ #define GD_FLG_SPL_EARLY_INIT 0x04000 /* Early SPL init is done */ #define GD_FLG_LOG_READY 0x08000 /* Log system is ready for use */ +#define GD_FLG_PR_PREFIX 0x10000 /* Print prefix before message */

#endif /* __ASM_GENERIC_GBL_DATA_H */