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 exynos[4/5]_map_io() function ioremaps a single 512KB memory size for all the four uart ports which envelopes the mapping created by debug_ll_io_init(), called earlier in exynos_init_io(). This issue seems to be occured after : commit ee4de5d99aeac44f4507b7538b2b3faedc5205b9 ARM: 7781/1: mmu: Add debug_ll_io_init() mappings to early mappings This series removes static iodesc entries for UART controller for all Samsung SoC's and modifies pm debug code to save/restore only the selected debug uart registers. changes since v1: - removed uart iodesc entires instead of just moving inside CONFIG_DEBUG_LL check, as suggested by Thomas Abraham. - Fixed the possible issue after removing uart entries pointed by Tomasz Figa. Tested doing suspend/resume on smdk5250. Yadwinder Singh Brar (2): ARM: SAMSUNG: pm: Save/restore only selected uart's registers ARM: EXYNOS: Fix low level debug support arch/arm/mach-exynos/common.c | 26 -------------------------- arch/arm/plat-samsung/pm.c | 14 +++----------- 2 files changed, 3 insertions(+), 37 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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