Messages in this thread Patch in this message | | | From | Doug Anderson <> | Subject | [PATCH v2] ARM: exynos: add debug_ll_io_init() call in exynos_init_io() | Date | Wed, 5 Jun 2013 13:56:33 -0700 |
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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> --- Changes in v2: - Use debug_ll_io_init() instead of reordering printks and adding warnings. Thanks Olof!
arch/arm/mach-exynos/common.c | 2 ++ 1 file changed, 2 insertions(+)
diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c index 027c9e7..f7e504b 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); -- 1.8.3
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