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arm: Implement the 'fake' go command

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Implement this feature on ARM for tracing.

It would be nice to have generic bootm support so that it is easily
implemented on any arch.

Signed-off-by: Simon Glass <sjg@chromium.org>
Acked-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
This commit is contained in:
Simon Glass 2013-06-19 21:15:10 -07:00 committed by Tom Rini
parent d0ae31eb07
commit bce1b92aa1
1 changed files with 18 additions and 9 deletions
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27
arch/arm/lib/bootm.c
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@ -68,12 +68,19 @@ void arch_lmb_reserve(struct lmb *lmb)
gd->bd->bi_dram[0].start + gd->bd->bi_dram[0].size - sp);
}
static void announce_and_cleanup(void)
/**
* announce_and_cleanup() - Print message and prepare for kernel boot
*
* @fake: non-zero to do everything except actually boot
*/
static void announce_and_cleanup(int fake)
{
printf("\nStarting kernel ...\n\n");
printf("\nStarting kernel ...%s\n\n", fake ?
"(fake run for tracing)" : "");
bootstage_mark_name(BOOTSTAGE_ID_BOOTM_HANDOFF, "start_kernel");
#ifdef CONFIG_BOOTSTAGE_FDT
bootstage_fdt_add_report();
if (flag == BOOTM_STATE_OS_FAKE_GO)
bootstage_fdt_add_report();
#endif
#ifdef CONFIG_BOOTSTAGE_REPORT
bootstage_report();
@ -225,12 +232,13 @@ static void boot_prep_linux(bootm_headers_t *images)
}
/* Subcommand: GO */
static void boot_jump_linux(bootm_headers_t *images)
static void boot_jump_linux(bootm_headers_t *images, int flag)
{
unsigned long machid = gd->bd->bi_arch_number;
char *s;
void (*kernel_entry)(int zero, int arch, uint params);
unsigned long r2;
int fake = (flag & BOOTM_STATE_OS_FAKE_GO);
kernel_entry = (void (*)(int, int, uint))images->ep;
@ -243,14 +251,15 @@ static void boot_jump_linux(bootm_headers_t *images)
debug("## Transferring control to Linux (at address %08lx)" \
"...\n", (ulong) kernel_entry);
bootstage_mark(BOOTSTAGE_ID_RUN_OS);
announce_and_cleanup();
announce_and_cleanup(fake);
if (IMAGE_ENABLE_OF_LIBFDT && images->ft_len)
r2 = (unsigned long)images->ft_addr;
else
r2 = gd->bd->bi_boot_params;
kernel_entry(0, machid, r2);
if (!fake)
kernel_entry(0, machid, r2);
}
/* Main Entry point for arm bootm implementation
@ -270,13 +279,13 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
return 0;
}
if (flag & BOOTM_STATE_OS_GO) {
boot_jump_linux(images);
if (flag & (BOOTM_STATE_OS_GO | BOOTM_STATE_OS_FAKE_GO)) {
boot_jump_linux(images, flag);
return 0;
}
boot_prep_linux(images);
boot_jump_linux(images);
boot_jump_linux(images, flag);
return 0;
}