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Add a 'fake' go command to the bootm command

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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>
This commit is contained in:
Simon Glass 2013-06-11 11:14:48 -07:00 committed by Tom Rini
parent 35fc84fa1f
commit d0ae31eb07
2 changed files with 19 additions and 3 deletions
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19
common/cmd_bootm.c
View file

@ -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");
@ -645,6 +648,17 @@ 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,
@ -754,7 +768,7 @@ 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_PREP |
BOOTM_STATE_OS_GO, &images, 1);
BOOTM_STATE_OS_FAKE_GO | BOOTM_STATE_OS_GO, &images, 1);
}
int bootm_maybe_autostart(cmd_tbl_t *cmdtp, const char *cmd)
@ -1731,7 +1745,8 @@ 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;
}

3
include/image.h
View file

@ -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