diff options
Diffstat (limited to 'target/linux/bcm53xx/patches-4.4/300-ARM-BCM5301X-Disable-MMU-and-Dcache-during-decompres.patch')
| -rw-r--r-- | target/linux/bcm53xx/patches-4.4/300-ARM-BCM5301X-Disable-MMU-and-Dcache-during-decompres.patch | 101 |
1 files changed, 0 insertions, 101 deletions
diff --git a/target/linux/bcm53xx/patches-4.4/300-ARM-BCM5301X-Disable-MMU-and-Dcache-during-decompres.patch b/target/linux/bcm53xx/patches-4.4/300-ARM-BCM5301X-Disable-MMU-and-Dcache-during-decompres.patch deleted file mode 100644 index 1c73775b43..0000000000 --- a/target/linux/bcm53xx/patches-4.4/300-ARM-BCM5301X-Disable-MMU-and-Dcache-during-decompres.patch +++ /dev/null @@ -1,101 +0,0 @@ -From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <rafal@milecki.pl> -Date: Wed, 24 Sep 2014 22:14:07 +0200 -Subject: [PATCH] ARM: BCM5301X: Disable MMU and Dcache during decompression -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -Broadcom devices have broken CFE (bootloader) that leaves hardware in an -invalid state. It causes problems with booting Linux. On Northstar -devices kernel was randomly hanging in ~25% of tries during early init. -Hangs used to happen at random places in the start_kernel. On BCM53573 -kernel doesn't even seem to start booting. - -To workaround this problem we need to do following very early: -1) Clear 2 following bits in the SCTLR register: -#define CR_M (1 << 0) /* MMU enable */ -#define CR_C (1 << 2) /* Dcache enable */ -2) Flush the whole D-cache -3) Disable L2 cache - -Unfortunately this patch is not upstreamable as it does above things -unconditionally. We can't check if we are running on Broadcom platform -in any safe way and doing such hacks with ARCH_MULTI_V7 is unacceptable -as it could break other devices support. - -Signed-off-by: Rafał Miłecki <rafal@milecki.pl> ---- - ---- a/arch/arm/boot/compressed/Makefile -+++ b/arch/arm/boot/compressed/Makefile -@@ -31,6 +31,11 @@ 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 -+OBJS += cache-v7-min.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 v7_flush_dcache_all -+ 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/cache-v7-min.S -+++ b/arch/arm/boot/compressed/cache-v7-min.S -@@ -12,6 +12,7 @@ - - #include <linux/linkage.h> - #include <linux/init.h> -+#include <asm/assembler.h> - - __INIT - -@@ -63,7 +64,7 @@ loop2: - ARM( orr r11, r11, r9, lsl r2 ) @ factor index number into r11 - THUMB( lsl r6, r9, r2 ) - THUMB( orr r11, r11, r6 ) @ factor index number into r11 -- mcr p15, 0, r11, c7, c14, 2 @ clean & invalidate by set/way -+ mcr p15, 0, r11, c7, c6, 2 @ clean & invalidate by set/way - subs r9, r9, #1 @ decrement the index - bge loop2 - subs r4, r4, #1 @ decrement the way |