diff options
Diffstat (limited to 'target/device/Atmel/linux/kernel-patches-2.6.22.1/linux-2.6.22.1-005-atags-support.patch')
| -rw-r--r-- | target/device/Atmel/linux/kernel-patches-2.6.22.1/linux-2.6.22.1-005-atags-support.patch | 122 |
1 files changed, 122 insertions, 0 deletions
diff --git a/target/device/Atmel/linux/kernel-patches-2.6.22.1/linux-2.6.22.1-005-atags-support.patch b/target/device/Atmel/linux/kernel-patches-2.6.22.1/linux-2.6.22.1-005-atags-support.patch new file mode 100644 index 000000000..0068ef17c --- /dev/null +++ b/target/device/Atmel/linux/kernel-patches-2.6.22.1/linux-2.6.22.1-005-atags-support.patch @@ -0,0 +1,122 @@ +--- linux-2.6.22/arch/arm/kernel/head-common.S 2007-05-16 10:13:04.000000000 -0500 ++++ linux-2.6.22-bgat/arch/arm/kernel/head-common.S 2007-05-30 21:54:45.000000000 -0500 +@@ -20,7 +20,8 @@ + .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 @@ + * + * r0 = cp#15 control register + * r1 = machine ID ++ * r2 = atags pointer + * r9 = processor ID + */ + .type __mmap_switched, %function +@@ -47,11 +49,12 @@ + 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 @@ + 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 +--- linux-2.6.22/arch/arm/kernel/head.S 2007-05-30 08:29:34.000000000 -0500 ++++ linux-2.6.22-bgat/arch/arm/kernel/head.S 2007-05-30 22:05:53.000000000 -0500 +@@ -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 @@ + 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 + + /* +--- linux-2.6.22/arch/arm/kernel/setup.c 2007-05-30 08:29:34.000000000 -0500 ++++ linux-2.6.22-bgat/arch/arm/kernel/setup.c 2007-05-30 22:07:08.000000000 -0500 +@@ -63,6 +63,8 @@ + 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 @@ + 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); + + /* |