For tracing it is useful to run as much of U-Boot as possible so as to get a complete picture. Quite a bit of work happens in bootm, and we don't want to have to stop tracing before bootm starts.
Add a way of doing a 'fake' boot of the OS - which does everything up to the point where U-Boot is about to jump to the OS image. This allows tracing to record right until the end.
This requires arch support to work.
Signed-off-by: Simon Glass sjg@chromium.org --- common/cmd_bootm.c | 20 ++++++++++++++++++-- include/image.h | 3 ++- 2 files changed, 20 insertions(+), 3 deletions(-)
diff --git a/common/cmd_bootm.c b/common/cmd_bootm.c index f441064..2a08b19 100644 --- a/common/cmd_bootm.c +++ b/common/cmd_bootm.c @@ -499,6 +499,7 @@ static cmd_tbl_t cmd_bootm_sub[] = { U_BOOT_CMD_MKENT(cmdline, 0, 1, (void *)BOOTM_STATE_OS_CMDLINE, "", ""), U_BOOT_CMD_MKENT(bdt, 0, 1, (void *)BOOTM_STATE_OS_BD_T, "", ""), U_BOOT_CMD_MKENT(prep, 0, 1, (void *)BOOTM_STATE_OS_PREP, "", ""), + U_BOOT_CMD_MKENT(fake, 0, 1, (void *)BOOTM_STATE_OS_FAKE_GO, "", ""), U_BOOT_CMD_MKENT(go, 0, 1, (void *)BOOTM_STATE_OS_GO, "", ""), };
@@ -539,6 +540,8 @@ static int boot_selected_os(int argc, char * const argv[], int state, #endif arch_preboot_os(); boot_fn(state, argc, argv, images); + if (state == BOOTM_STATE_OS_FAKE_GO) /* We expect to return */ + return 0; bootstage_error(BOOTSTAGE_ID_BOOT_OS_RETURNED); #ifdef DEBUG puts("\n## Control returned to monitor - resetting...\n"); @@ -646,6 +649,17 @@ static int do_bootm_states(cmd_tbl_t *cmdtp, int flag, int argc, if (!ret && (states & BOOTM_STATE_OS_PREP)) ret = boot_fn(BOOTM_STATE_OS_PREP, argc, argv, images);
+#ifdef CONFIG_TRACE + /* Pretend to run the OS, then run a user command */ + if (!ret && (states & BOOTM_STATE_OS_FAKE_GO)) { + char *cmd_list = getenv("fakegocmd"); + + ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_FAKE_GO, + images, boot_fn, &iflag); + if (!ret && cmd_list) + ret = run_command_list(cmd_list, -1, flag); + } +#endif /* Now run the OS! We hope this doesn't return */ if (!ret && (states & BOOTM_STATE_OS_GO)) ret = boot_selected_os(argc, argv, BOOTM_STATE_OS_GO, @@ -755,7 +769,8 @@ int do_bootm(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[])
return do_bootm_states(cmdtp, flag, argc, argv, BOOTM_STATE_START | BOOTM_STATE_FINDOS | BOOTM_STATE_FINDOTHER | - BOOTM_STATE_LOADOS | BOOTM_STATE_OS_GO, &images, 1); + BOOTM_STATE_LOADOS | BOOTM_STATE_OS_FAKE_GO | + BOOTM_STATE_OS_GO, &images, 1); }
int bootm_maybe_autostart(cmd_tbl_t *cmdtp, const char *cmd) @@ -1716,7 +1731,8 @@ static int do_bootz(cmd_tbl_t *cmdtp, int flag, int argc, char * const argv[]) return 1;
ret = do_bootm_states(cmdtp, flag, argc, argv, - BOOTM_STATE_OS_GO, &images, 1); + BOOTM_STATE_OS_FAKE_GO | BOOTM_STATE_OS_GO, + &images, 1);
return ret; } diff --git a/include/image.h b/include/image.h index 8675a82..4415bcf 100644 --- a/include/image.h +++ b/include/image.h @@ -328,7 +328,8 @@ typedef struct bootm_headers { #define BOOTM_STATE_OS_CMDLINE (0x00000040) #define BOOTM_STATE_OS_BD_T (0x00000080) #define BOOTM_STATE_OS_PREP (0x00000100) -#define BOOTM_STATE_OS_GO (0x00000200) +#define BOOTM_STATE_OS_FAKE_GO (0x00000200) /* 'Almost' run the OS */ +#define BOOTM_STATE_OS_GO (0x00000400) int state;
#ifdef CONFIG_LMB