diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-3.14/042-ARM-BCM5301X-workaround-suppress-fault.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-3.14/042-ARM-BCM5301X-workaround-suppress-fault.patch | 93 |
1 files changed, 0 insertions, 93 deletions
diff --git a/target/linux/bcm53xx/patches-3.14/042-ARM-BCM5301X-workaround-suppress-fault.patch b/target/linux/bcm53xx/patches-3.14/042-ARM-BCM5301X-workaround-suppress-fault.patch deleted file mode 100644 index 41a9dd1..0000000 --- a/target/linux/bcm53xx/patches-3.14/042-ARM-BCM5301X-workaround-suppress-fault.patch +++ /dev/null @@ -1,93 +0,0 @@ -From fdf4850cb5b2e5e549a18b8b41abb001bfb19e9c Mon Sep 17 00:00:00 2001 -From: Hauke Mehrtens <hauke@hauke-m.de> -Date: Tue, 4 Feb 2014 00:01:46 +0100 -Subject: [PATCH 3/3] ARM: BCM5301X: workaround suppress fault - -Without this patch I am getting a unhandled fault exception like this -one after "Freeing unused kernel memory": - -Freeing unused kernel memory: 1260K (c02c1000 - c03fc000) -Unhandled fault: imprecise external abort (0x1c06) at 0xb6f89005 -Kernel panic - not syncing: Attempted to kill init! exitcode=0x00000007 - -The address which is here 0xb6f89005 changes from boot to boot, with a -new build the changes are bigger. With kernel 3.10 I have also seen -this fault at different places in the boot process, but starting with -3.11 they are always occurring after the "Freeing unused kernel memory" -message. I never was able to completely boot to userspace without this -handler. The abort code is constant 0x1c06. This fault just happens -once in the boot process I have never seen it happing twice or more. - -I also tried changing the CPSR.A bit to 0 in init_early, with this code -like Afzal suggested, but that did not change anything: -asm volatile("mrs r12, cpsr\n" - "bic r12, r12, #0x00000100\n" - "msr cpsr_c, r12" ::: "r12", "cc", "memory"); - -Disabling the L2 cache by building with CONFIG_CACHE_L2X0 unset did not -help. - -This workaround was copied from the vendor code including most of the -comments. It says it they think this is caused by the CFE boot loader -used on this device. I do not have any access to any datasheet or -errata document to check this. - -Signed-off-by: Hauke Mehrtens <hauke@hauke-m.de> -Acked-by: Arnd Bergmann <arnd@arndb.de> -Acked-by: Christian Daudt <bcm@fixthebug.org> -Signed-off-by: Matt Porter <mporter@linaro.org> ---- - arch/arm/mach-bcm/bcm_5301x.c | 33 +++++++++++++++++++++++++++++++++ - 1 file changed, 33 insertions(+) - ---- a/arch/arm/mach-bcm/bcm_5301x.c -+++ b/arch/arm/mach-bcm/bcm_5301x.c -@@ -9,8 +9,40 @@ - #include <asm/hardware/cache-l2x0.h> - - #include <asm/mach/arch.h> -+#include <asm/siginfo.h> -+#include <asm/signal.h> - - -+static bool first_fault = true; -+ -+static int bcm5301x_abort_handler(unsigned long addr, unsigned int fsr, -+ struct pt_regs *regs) -+{ -+ if (fsr == 0x1c06 && first_fault) { -+ first_fault = false; -+ -+ /* -+ * These faults with code 0x1c06 happens for no good reason, -+ * possibly left over from the CFE boot loader. -+ */ -+ pr_warn("External imprecise Data abort at addr=%#lx, fsr=%#x ignored.\n", -+ addr, fsr); -+ -+ /* Returning non-zero causes fault display and panic */ -+ return 0; -+ } -+ -+ /* Others should cause a fault */ -+ return 1; -+} -+ -+static void __init bcm5301x_init_early(void) -+{ -+ /* Install our hook */ -+ hook_fault_code(16 + 6, bcm5301x_abort_handler, SIGBUS, BUS_OBJERR, -+ "imprecise external abort"); -+} -+ - static void __init bcm5301x_dt_init(void) - { - l2x0_of_init(0, ~0UL); -@@ -23,6 +55,7 @@ static const char __initconst *bcm5301x_ - }; - - DT_MACHINE_START(BCM5301X, "BCM5301X") -+ .init_early = bcm5301x_init_early, - .init_machine = bcm5301x_dt_init, - .dt_compat = bcm5301x_dt_compat, - MACHINE_END |