Presently, using exynos_defconfig with CONFIG_DEBUG_LL and CONFIG_EARLY_PRINTK on, kernel is not booting, we are getting following:
[ 0.000000] ------------[ cut here ]------------ [ 0.000000] kernel BUG at mm/vmalloc.c:1134! [ 0.000000] Internal error: Oops - BUG: 0 [#1] PREEMPT SMP ARM [ 0.000000] Modules linked in: [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.11.0-rc1 #633 [ 0.000000] task: c052ec48 ti: c0524000 task.ti: c0524000 [ 0.000000] PC is at vm_area_add_early+0x54/0x94 [ 0.000000] LR is at add_static_vm_early+0xc/0x60 Its because iotable_init tries to map UART again which is already mapped by debug_ll_io_init() call in exynos_init_io() within same virtal address range as requested later. This issue seems to be occured after : commit ee4de5d99aeac44f4507b7538b2b3faedc5205b9 ARM: 7781/1: mmu: Add debug_ll_io_init() mappings to early mappings This patch moves S3C_UART iodesc(in iodesc_list) inside CONFIG_DEBUG_LL check. Tested on 4412 and 5250 smdks. Signed-off-by: Yadwinder Singh Brar <[email protected]> --- arch/arm/mach-exynos/common.c | 20 ++++++++++++++------ 1 files changed, 14 insertions(+), 6 deletions(-) diff --git a/arch/arm/mach-exynos/common.c b/arch/arm/mach-exynos/common.c index 164685b..7f0591f 100644 --- a/arch/arm/mach-exynos/common.c +++ b/arch/arm/mach-exynos/common.c @@ -150,11 +150,6 @@ static struct map_desc exynos4_iodesc[] __initdata = { .length = SZ_64K, .type = MT_DEVICE, }, { - .virtual = (unsigned long)S3C_VA_UART, - .pfn = __phys_to_pfn(EXYNOS4_PA_UART), - .length = SZ_512K, - .type = MT_DEVICE, - }, { .virtual = (unsigned long)S5P_VA_CMU, .pfn = __phys_to_pfn(EXYNOS4_PA_CMU), .length = SZ_128K, @@ -185,6 +180,14 @@ static struct map_desc exynos4_iodesc[] __initdata = { .length = SZ_4K, .type = MT_DEVICE, }, +#ifndef CONFIG_DEBUG_LL + { + .virtual = (unsigned long)S3C_VA_UART, + .pfn = __phys_to_pfn(EXYNOS4_PA_UART), + .length = SZ_512K, + .type = MT_DEVICE, + }, +#endif }; static struct map_desc exynos4_iodesc0[] __initdata = { @@ -268,21 +271,26 @@ static struct map_desc exynos5_iodesc[] __initdata = { .pfn = __phys_to_pfn(EXYNOS5_PA_PMU), .length = SZ_64K, .type = MT_DEVICE, - }, { + }, +#ifndef CONFIG_DEBUG_LL + { .virtual = (unsigned long)S3C_VA_UART, .pfn = __phys_to_pfn(EXYNOS5_PA_UART), .length = SZ_512K, .type = MT_DEVICE, }, +#endif }; static struct map_desc exynos5440_iodesc0[] __initdata = { +#ifndef CONFIG_DEBUG_LL { .virtual = (unsigned long)S3C_VA_UART, .pfn = __phys_to_pfn(EXYNOS5440_PA_UART0), .length = SZ_512K, .type = MT_DEVICE, }, +#endif }; void exynos4_restart(enum reboot_mode mode, const char *cmd) -- 1.7.0.4 -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
