[PATCH v2 6/6] boot: Call flush() before booting

Pali Rohár
2022-08-11T12:40:40Z

In lot of cases kernel resets UART HW. To ensure that U-Boot messages
printed before booting kernel are not lost, call new U-Boot console flush()
function.

Signed-off-by: Pali Rohár <pali@kernel.org>
---
boot/bootm_os.c | 1 +
cmd/boot.c | 1 +
cmd/elf.c | 2 ++
3 files changed, 4 insertions(+)

diff --git a/boot/bootm_os.c b/boot/bootm_os.c
index f31820cd07ef..079224ce585b 100644
--- a/boot/bootm_os.c
+++ b/boot/bootm_os.c
@@ -303,6 +303,7 @@ static void do_bootvx_fdt(bootm_headers_t *images)
#else
printf("## Starting vxWorks at 0x%08lx\n", (ulong)images->ep);
#endif
+ flush();

boot_jump_vxworks(images);

diff --git a/cmd/boot.c b/cmd/boot.c
index be67a5980de3..14839c1cedcc 100644
--- a/cmd/boot.c
+++ b/cmd/boot.c
@@ -32,6 +32,7 @@ static int do_go(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
addr = hextoul(argv[1], NULL);

printf ("## Starting application at 0x%08lX ...\n", addr);
+ flush();

/*
* pass address parameter as argv[0] (aka command name),
diff --git a/cmd/elf.c b/cmd/elf.c
index 2b33c50bd026..413d551dc05e 100644
--- a/cmd/elf.c
+++ b/cmd/elf.c
@@ -72,6 +72,7 @@ int do_bootelf(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
return rcode;

printf("## Starting application at 0x%08lx ...\n", addr);
+ flush();

/*
* pass address parameter as argv[0] (aka command name),
@@ -274,6 +275,7 @@ int do_bootvx(struct cmd_tbl *cmdtp, int flag, int argc, char *const argv[])
puts("## Not an ELF image, assuming binary\n");

printf("## Starting vxWorks at 0x%08lx ...\n", addr);
+ flush();

dcache_disable();
#if defined(CONFIG_ARM64) && defined(CONFIG_ARMV8_PSCI)
--
2.20.1