diff options
| author | Doug Anderson <dianders@chromium.org> | 2013-06-05 13:56:33 -0700 |
|---|---|---|
| committer | Olof Johansson <olof@lixom.net> | 2013-06-07 18:12:00 -0700 |
| commit | 9c1fcdccc7ce5611ec1edf45dbbe51b10e333bd3 (patch) | |
| tree | ecc6760a64b282615c38cdd4f53276e0520e230a | |
| parent | fb565ff7c885893dd33ba48f730d32b50aa350ea (diff) | |
ARM: exynos: add debug_ll_io_init() call in exynos_init_io()
If the early MMU mapping of the UART happens to get booted out of the
TLB between the start of paging_init() and when we finally re-add the
UART at the very end of s3c_init_cpu(), we'll get a hang at bootup if
we've got early_printk enabled. Avoid this hang by calling
debug_ll_io_init() early.
Without this patch, you can reliably reproduce a hang when early
printk is enabled by adding flush_tlb_all() at the start of
exynos_init_io(). After this patch the hang goes away.
Signed-off-by: Doug Anderson <dianders@chromium.org>
Acked-by: Kukjin Kim <kgene.kim@samsung.com>
Signed-off-by: Olof Johansson <olof@lixom.net>
| -rw-r--r-- | arch/arm/mach-exynos/common.c | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c index 027c9e7f0d13..f7e504b7874d 100644 --- a/arch/arm/mach-exynos/common.c +++ b/arch/arm/mach-exynos/common.c @@ -386,6 +386,8 @@ int __init exynos_fdt_map_chipid(unsigned long node, const char *uname, void __init exynos_init_io(struct map_desc *mach_desc, int size) { + debug_ll_io_init(); + #ifdef CONFIG_OF if (initial_boot_params) of_scan_flat_dt(exynos_fdt_map_chipid, NULL); |