diff options
Diffstat (limited to 'recipes/linux/linux-handhelds-2.6-2.6.21/linux-2.6.git-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.patch')
| -rw-r--r-- | recipes/linux/linux-handhelds-2.6-2.6.21/linux-2.6.git-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.patch | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/recipes/linux/linux-handhelds-2.6-2.6.21/linux-2.6.git-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.patch b/recipes/linux/linux-handhelds-2.6-2.6.21/linux-2.6.git-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.patch new file mode 100644 index 0000000000..f3c27d33a8 --- /dev/null +++ b/recipes/linux/linux-handhelds-2.6-2.6.21/linux-2.6.git-9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a.patch @@ -0,0 +1,144 @@ +From: Bill Gatliff <bgat@billgatliff.com> +Date: Thu, 31 May 2007 21:02:22 +0000 (+0100) +Subject: [ARM] 4423/1: add ATAGS support +X-Git-Tag: v2.6.23-rc1~1101^2^7~5 +X-Git-Url: http://git.kernel.org/?p=linux%2Fkernel%2Fgit%2Ftorvalds%2Flinux-2.6.git;a=commitdiff_plain;h=9d20fdd58e74d4d26dc5216efaaa0f800c23dd3a + +[ARM] 4423/1: add ATAGS support + +Examines the ATAGS pointer (r2) at boot, and interprets +a nonzero value as a reference to an ATAGS structure. A +suitable ATAGS structure replaces the kernel's command line. + +Signed-off-by: Bill Gatliff <bgat@billgatliff.com> +Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk> +--- + +diff --git a/arch/arm/kernel/head-common.S b/arch/arm/kernel/head-common.S +index a52da0d..024a9cf 100644 +--- a/arch/arm/kernel/head-common.S ++++ b/arch/arm/kernel/head-common.S +@@ -20,7 +20,8 @@ __switch_data: + .long _end @ r7 + .long processor_id @ r4 + .long __machine_arch_type @ r5 +- .long cr_alignment @ r6 ++ .long __atags_pointer @ r6 ++ .long cr_alignment @ r7 + .long init_thread_union + THREAD_START_SP @ sp + + /* +@@ -29,6 +30,7 @@ __switch_data: + * + * r0 = cp#15 control register + * r1 = machine ID ++ * r2 = atags pointer + * r9 = processor ID + */ + .type __mmap_switched, %function +@@ -47,11 +49,12 @@ __mmap_switched: + strcc fp, [r6],#4 + bcc 1b + +- ldmia r3, {r4, r5, r6, sp} ++ ldmia r3, {r4, r5, r6, r7, sp} + str r9, [r4] @ Save processor ID + str r1, [r5] @ Save machine type ++ str r2, [r6] @ Save atags pointer + bic r4, r0, #CR_A @ Clear 'A' bit +- stmia r6, {r0, r4} @ Save control register values ++ stmia r7, {r0, r4} @ Save control register values + b start_kernel + + /* +@@ -215,3 +218,34 @@ ENTRY(lookup_machine_type) + bl __lookup_machine_type + mov r0, r5 + ldmfd sp!, {r4 - r6, pc} ++ ++/* Determine validity of the r2 atags pointer. The heuristic requires ++ * that the pointer be aligned, in the first 16k of physical RAM and ++ * that the ATAG_CORE marker is first and present. Future revisions ++ * of this function may be more lenient with the physical address and ++ * may also be able to move the ATAGS block if necessary. ++ * ++ * r8 = machinfo ++ * ++ * Returns: ++ * r2 either valid atags pointer, or zero ++ * r5, r6 corrupted ++ */ ++ ++ .type __vet_atags, %function ++__vet_atags: ++ tst r2, #0x3 @ aligned? ++ bne 1f ++ ++ ldr r5, [r2, #0] @ is first tag ATAG_CORE? ++ subs r5, r5, #ATAG_CORE_SIZE ++ bne 1f ++ ldr r5, [r2, #4] ++ ldr r6, =ATAG_CORE ++ cmp r5, r6 ++ bne 1f ++ ++ mov pc, lr @ atag pointer is ok ++ ++1: mov r2, #0 ++ mov pc, lr +diff --git a/arch/arm/kernel/head.S b/arch/arm/kernel/head.S +index 41f98b4..7898cbc 100644 +--- a/arch/arm/kernel/head.S ++++ b/arch/arm/kernel/head.S +@@ -29,6 +29,10 @@ + #define KERNEL_RAM_VADDR (PAGE_OFFSET + TEXT_OFFSET) + #define KERNEL_RAM_PADDR (PHYS_OFFSET + TEXT_OFFSET) + ++#define ATAG_CORE 0x54410001 ++#define ATAG_CORE_SIZE ((2*4 + 3*4) >> 2) ++ ++ + /* + * swapper_pg_dir is the virtual address of the initial page table. + * We place the page tables 16K below KERNEL_RAM_VADDR. Therefore, we must +@@ -61,7 +65,7 @@ + * + * This is normally called from the decompressor code. The requirements + * are: MMU = off, D-cache = off, I-cache = dont care, r0 = 0, +- * r1 = machine nr. ++ * r1 = machine nr, r2 = atags pointer. + * + * This code is mostly position independent, so if you link the kernel at + * 0xc0008000, you call this at __pa(0xc0008000). +@@ -85,6 +89,7 @@ ENTRY(stext) + bl __lookup_machine_type @ r5=machinfo + movs r8, r5 @ invalid machine (r5=0)? + beq __error_a @ yes, error 'a' ++ bl __vet_atags + bl __create_page_tables + + /* +diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c +index 650eac1..5be2e98 100644 +--- a/arch/arm/kernel/setup.c ++++ b/arch/arm/kernel/setup.c +@@ -63,6 +63,8 @@ unsigned int processor_id; + unsigned int __machine_arch_type; + EXPORT_SYMBOL(__machine_arch_type); + ++unsigned int __atags_pointer __initdata; ++ + unsigned int system_rev; + EXPORT_SYMBOL(system_rev); + +@@ -780,7 +782,9 @@ void __init setup_arch(char **cmdline_p) + if (mdesc->soft_reboot) + reboot_setup("s"); + +- if (mdesc->boot_params) ++ if (__atags_pointer) ++ tags = phys_to_virt(__atags_pointer); ++ else if (mdesc->boot_params) + tags = phys_to_virt(mdesc->boot_params); + + /* |