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authorSimon Glass <sjg@chromium.org>2013-06-19 21:15:10 -0700
committerTom Rini <trini@ti.com>2013-06-26 10:18:56 -0400
commitbce1b92aa11fc7dadae19452e9ff84c33a4b0c9a (patch)
tree7789526824d4bbb23e8b3181d5af81b49d115f22 /arch
parentd0ae31eb0714a8b44dcdb644f8b68dafdbc1c197 (diff)
arm: Implement the 'fake' go command
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>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/lib/bootm.c27
1 files changed, 18 insertions, 9 deletions
diff --git a/arch/arm/lib/bootm.c b/arch/arm/lib/bootm.c
index 1b6e0ace45..b22fbc9982 100644
--- a/arch/arm/lib/bootm.c
+++ b/arch/arm/lib/bootm.c
@@ -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;
}