diff options
Diffstat (limited to 'recipes/linux/ep93xx-kernel/dynamic-phys-offset-2.6.20-rc7.diff')
| -rw-r--r-- | recipes/linux/ep93xx-kernel/dynamic-phys-offset-2.6.20-rc7.diff | 199 |
1 files changed, 199 insertions, 0 deletions
diff --git a/recipes/linux/ep93xx-kernel/dynamic-phys-offset-2.6.20-rc7.diff b/recipes/linux/ep93xx-kernel/dynamic-phys-offset-2.6.20-rc7.diff new file mode 100644 index 0000000000..1f59be644e --- /dev/null +++ b/recipes/linux/ep93xx-kernel/dynamic-phys-offset-2.6.20-rc7.diff @@ -0,0 +1,199 @@ +On the Cirrus Logic ep93xx, system RAM isn't one nice physically +contiguous region as it is on most SoCs, but it is spread out over +between one and four memory banks. + +What's worse, RAM doesn't necessarily start at any fixed physical +memory location. The start of RAM (PHYS_OFFSET) is not only board- +specific, but on some boards also depends on jumper settings (whether +async or sync boot mode is selected.) + +The attached patch adds the RUNTIME_PHYS_OFFSET config option, which, +if selected, turns PHYS_OFFSET into a variable which is determined and +set by __create_page_tables by looking at the current pc. This allows +booting a single kernel image on all the different flavors of ep93xx +boards, reducing user confusion and hopefully pleasing our kautobuild +admin :-) If the option isn't selected, there's zero impact. + +Signed-off-by: Lennert Buytenhek <buytenh@wantstofly.org> +=================================================================== +20070202 modified to apply cleanly to linux-2.6.20-rc7 - NZG +=================================================================== +diff -Naur linux-2.6.20-rc7/arch/arm/Kconfig linux-2.6.20-rc7-e1.0/arch/arm/Kconfig +--- linux-2.6.20-rc7/arch/arm/Kconfig 2007-02-02 10:26:21.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/Kconfig 2007-02-02 16:23:05.000000000 -0600 +@@ -113,6 +113,9 @@ + help + The base address of exception vectors. + ++config RUNTIME_PHYS_OFFSET ++ bool ++ + source "init/Kconfig" + + menu "System Type" +@@ -187,6 +190,7 @@ + bool "EP93xx-based" + select ARM_AMBA + select ARM_VIC ++ select RUNTIME_PHYS_OFFSET + help + This enables support for the Cirrus EP93xx series of CPUs. + +diff -Naur linux-2.6.20-rc7/arch/arm/boot/compressed/Makefile linux-2.6.20-rc7-e1.0/arch/arm/boot/compressed/Makefile +--- linux-2.6.20-rc7/arch/arm/boot/compressed/Makefile 2006-11-29 15:57:37.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/boot/compressed/Makefile 2007-02-02 16:23:05.000000000 -0600 +@@ -78,13 +78,10 @@ + EXTRA_CFLAGS := -fpic + EXTRA_AFLAGS := + +-# Supply ZRELADDR, INITRD_PHYS and PARAMS_PHYS to the decompressor via +-# linker symbols. We only define initrd_phys and params_phys if the +-# machine class defined the corresponding makefile variable. ++# Supply ZRELADDR and PARAMS_PHYS to the decompressor via linker ++# symbols. We only define params_phys if the machine class defined ++# the corresponding makefile variable. + LDFLAGS_vmlinux := --defsym zreladdr=$(ZRELADDR) +-ifneq ($(INITRD_PHYS),) +-LDFLAGS_vmlinux += --defsym initrd_phys=$(INITRD_PHYS) +-endif + ifneq ($(PARAMS_PHYS),) + LDFLAGS_vmlinux += --defsym params_phys=$(PARAMS_PHYS) + endif +diff -Naur linux-2.6.20-rc7/arch/arm/boot/compressed/head.S linux-2.6.20-rc7-e1.0/arch/arm/boot/compressed/head.S +--- linux-2.6.20-rc7/arch/arm/boot/compressed/head.S 2006-11-29 15:57:37.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/boot/compressed/head.S 2007-02-02 16:23:05.000000000 -0600 +@@ -156,6 +156,11 @@ + .text + adr r0, LC0 + ldmia r0, {r1, r2, r3, r4, r5, r6, ip, sp} ++#ifdef CONFIG_RUNTIME_PHYS_OFFSET ++ and r10, pc, #0xf0000000 @ fix up zreladdr ++ add r4, r4, r10 ++#endif ++ + subs r0, r0, r1 @ calculate the delta offset + + @ if delta is zero, we are +diff -Naur linux-2.6.20-rc7/arch/arm/kernel/head.S linux-2.6.20-rc7-e1.0/arch/arm/kernel/head.S +--- linux-2.6.20-rc7/arch/arm/kernel/head.S 2007-02-02 10:26:21.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/kernel/head.S 2007-02-02 16:36:21.000000000 -0600 +@@ -43,8 +43,8 @@ + .globl swapper_pg_dir + .equ swapper_pg_dir, KERNEL_RAM_VADDR - 0x4000 + +- .macro pgtbl, rd +- ldr \rd, =(KERNEL_RAM_PADDR - 0x4000) ++ .macro pgtbl, rd, phys_offset ++ add \rd, \phys_offset, #(TEXT_OFFSET - 0x4000) + .endm + + #ifdef CONFIG_XIP_KERNEL +@@ -206,10 +206,22 @@ + * Returns: + * r0, r3, r6, r7 corrupted + * r4 = physical page table address ++ * r5 = PHYS_OFFSET + */ + .type __create_page_tables, %function + __create_page_tables: +- pgtbl r4 @ page table address ++#ifdef CONFIG_RUNTIME_PHYS_OFFSET ++ adr r5, stext ++ sub r5, r5, #TEXT_OFFSET @ r5 = phys_offset ++ ++ ldr r4, =(phys_offset - PAGE_OFFSET) ++ add r4, r4, r5 ++ str r5, [r4] @ save phys_offset ++#else ++ mov r5, #PHYS_OFFSET @ r5 = phys_offset ++#endif ++ ++ pgtbl r4, r5 @ r4 = page table address + + /* + * Clear the 16K level 1 swapper page table +@@ -255,8 +267,7 @@ + * Then map first 1MB of ram in case it contains our boot params. + */ + add r0, r4, #PAGE_OFFSET >> 18 +- orr r6, r7, #(PHYS_OFFSET & 0xff000000) +- orr r6, r6, #(PHYS_OFFSET & 0x00e00000) ++ orr r6, r7, r5 + str r6, [r0] + + #ifdef CONFIG_XIP_KERNEL +diff -Naur linux-2.6.20-rc7/arch/arm/kernel/setup.c linux-2.6.20-rc7-e1.0/arch/arm/kernel/setup.c +--- linux-2.6.20-rc7/arch/arm/kernel/setup.c 2007-02-02 10:26:21.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/kernel/setup.c 2007-02-02 16:23:05.000000000 -0600 +@@ -59,6 +59,16 @@ + extern int root_mountflags; + extern void _stext, _text, _etext, __data_start, _edata, _end; + ++#ifdef CONFIG_RUNTIME_PHYS_OFFSET ++/* ++ * The assignment is here solely to prevent this variable from ending ++ * up in bss. As the early startup code writes to it, we don't want it ++ * to be zeroed again later. ++ */ ++unsigned long phys_offset = 0xdeadbeef; ++EXPORT_SYMBOL(phys_offset); ++#endif ++ + unsigned int processor_id; + unsigned int __machine_arch_type; + EXPORT_SYMBOL(__machine_arch_type); +@@ -749,7 +759,7 @@ + { tag_size(tag_core), ATAG_CORE }, + { 1, PAGE_SIZE, 0xff }, + { tag_size(tag_mem32), ATAG_MEM }, +- { MEM_SIZE, PHYS_OFFSET }, ++ { MEM_SIZE, 0 }, + { 0, ATAG_NONE } + }; + +@@ -770,6 +780,8 @@ + struct machine_desc *mdesc; + char *from = default_command_line; + ++ init_tags.mem.start = PHYS_OFFSET; ++ + setup_processor(); + mdesc = setup_machine(machine_arch_type); + machine_name = mdesc->name; +diff -Naur linux-2.6.20-rc7/arch/arm/mach-ep93xx/Makefile.boot linux-2.6.20-rc7-e1.0/arch/arm/mach-ep93xx/Makefile.boot +--- linux-2.6.20-rc7/arch/arm/mach-ep93xx/Makefile.boot 2006-11-29 15:57:37.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/arch/arm/mach-ep93xx/Makefile.boot 2007-02-02 16:23:05.000000000 -0600 +@@ -1,2 +1 @@ + zreladdr-y := 0x00008000 +-params_phys-y := 0x00000100 +diff -Naur linux-2.6.20-rc7/include/asm-arm/arch-ep93xx/memory.h linux-2.6.20-rc7-e1.0/include/asm-arm/arch-ep93xx/memory.h +--- linux-2.6.20-rc7/include/asm-arm/arch-ep93xx/memory.h 2006-11-29 15:57:37.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/include/asm-arm/arch-ep93xx/memory.h 2007-02-02 16:23:05.000000000 -0600 +@@ -5,7 +5,9 @@ + #ifndef __ASM_ARCH_MEMORY_H + #define __ASM_ARCH_MEMORY_H + ++#ifndef CONFIG_RUNTIME_PHYS_OFFSET + #define PHYS_OFFSET UL(0x00000000) ++#endif + + #define __bus_to_virt(x) __phys_to_virt(x) + #define __virt_to_bus(x) __virt_to_phys(x) +diff -Naur linux-2.6.20-rc7/include/asm-arm/memory.h linux-2.6.20-rc7-e1.0/include/asm-arm/memory.h +--- linux-2.6.20-rc7/include/asm-arm/memory.h 2007-02-02 10:26:27.000000000 -0600 ++++ linux-2.6.20-rc7-e1.0/include/asm-arm/memory.h 2007-02-02 16:23:05.000000000 -0600 +@@ -73,6 +73,14 @@ + */ + #define IOREMAP_MAX_ORDER 24 + ++/* ++ * PHYS_OFFSET determined at run time? ++ */ ++#if defined(CONFIG_RUNTIME_PHYS_OFFSET) && !defined(__ASSEMBLY__) ++extern unsigned long phys_offset; ++#define PHYS_OFFSET (phys_offset) ++#endif ++ + #else /* CONFIG_MMU */ + + /* |