diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.3/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.3/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch | 86 |
1 files changed, 86 insertions, 0 deletions
diff --git a/target/linux/bcm53xx/patches-4.3/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch b/target/linux/bcm53xx/patches-4.3/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch new file mode 100644 index 0000000..62bda2e --- /dev/null +++ b/target/linux/bcm53xx/patches-4.3/300-ARM-BCM5301X-Disable-MMU-and-Dcache-for-decompression.patch @@ -0,0 +1,86 @@ +From: Florian Fainelli <f.fainelli@gmail.com> +Subject: [PATCH] ARM: BCM5301x: Disable MMU and Dcache during decompression +Date: Tue, 14 Jul 2015 16:12:08 -0700 + +Use the existing __armv7_mmu_cache_flush() to perform the cache flush +since this does what we are after. + +Signed-off-by: Florian Fainelli <f.fainelli@gmail.com> +--- + arch/arm/boot/compressed/Makefile | 4 +++ + arch/arm/boot/compressed/head-bcm_5301x-mpcore.S | 37 ++++++++++++++++++++++++ + arch/arm/boot/compressed/head.S | 2 ++ + 3 files changed, 43 insertions(+) + create mode 100644 arch/arm/boot/compressed/head-bcm_5301x-mpcore.S + +--- a/arch/arm/boot/compressed/Makefile ++++ b/arch/arm/boot/compressed/Makefile +@@ -31,6 +31,10 @@ ifeq ($(CONFIG_ARCH_ACORN),y) + OBJS += ll_char_wr.o font.o + endif + ++ifeq ($(CONFIG_ARCH_BCM_5301X),y) ++OBJS += head-bcm_5301x-mpcore.o ++endif ++ + ifeq ($(CONFIG_ARCH_SA1100),y) + OBJS += head-sa1100.o + endif +--- /dev/null ++++ b/arch/arm/boot/compressed/head-bcm_5301x-mpcore.S +@@ -0,0 +1,37 @@ ++/* ++ * ++ * Platform specific tweaks. This is merged into head.S by the linker. ++ * ++ */ ++ ++#include <linux/linkage.h> ++#include <asm/assembler.h> ++#include <asm/cp15.h> ++ ++ .section ".start", "ax" ++ ++/* ++ * This code section is spliced into the head code by the linker ++ */ ++ ++__plat_uncompress_start: ++ ++ @ Preserve r8/r7 i.e. kernel entry values ++ mov r12, r8 ++ ++ @ Clear MMU enable and Dcache enable bits ++ mrc p15, 0, r0, c1, c0, 0 @ Read SCTLR ++ bic r0, #CR_C|CR_M ++ mcr p15, 0, r0, c1, c0, 0 @ Write SCTLR ++ nop ++ ++ @ Call the cache invalidation routine ++ bl __armv7_mmu_cache_flush_fn ++ nop ++ mov r0,#0 ++ ldr r3, =0x19022000 @ L2 cache controller, control reg ++ str r0, [r3, #0x100] @ Disable L2 cache ++ nop ++ ++ @ Restore ++ mov r8, r12 +--- a/arch/arm/boot/compressed/head.S ++++ b/arch/arm/boot/compressed/head.S +@@ -1152,6 +1152,7 @@ __armv7_mmu_cache_flush: + hierarchical: + mcr p15, 0, r10, c7, c10, 5 @ DMB + stmfd sp!, {r0-r7, r9-r11} ++ENTRY(__armv7_mmu_cache_flush_fn) + mrc p15, 1, r0, c0, c0, 1 @ read clidr + ands r3, r0, #0x7000000 @ extract loc from clidr + mov r3, r3, lsr #23 @ left align loc bit field +@@ -1201,6 +1202,7 @@ iflush: + mcr p15, 0, r10, c7, c10, 4 @ DSB + mcr p15, 0, r10, c7, c5, 4 @ ISB + mov pc, lr ++ENDPROC(__armv7_mmu_cache_flush_fn) + + __armv5tej_mmu_cache_flush: + tst r4, #1 |