diff options
Diffstat (limited to 'recipes/u-boot/u-boot-mkimage-openmoko-native/boot-from-ram-reloc.patch')
| -rw-r--r-- | recipes/u-boot/u-boot-mkimage-openmoko-native/boot-from-ram-reloc.patch | 62 |
1 files changed, 62 insertions, 0 deletions
diff --git a/recipes/u-boot/u-boot-mkimage-openmoko-native/boot-from-ram-reloc.patch b/recipes/u-boot/u-boot-mkimage-openmoko-native/boot-from-ram-reloc.patch new file mode 100644 index 0000000000..53a3e05c67 --- /dev/null +++ b/recipes/u-boot/u-boot-mkimage-openmoko-native/boot-from-ram-reloc.patch @@ -0,0 +1,62 @@ +This patch allows us to boot from anywhere in RAM. It mainly sets the stage +for later patches. The only real changes here is the better handling of already +cached code (e.g., if we were started by a previous instance of u-boot), and +that we drop CONFIG_SKIP_RELOCATE_UBOOT from neo1973.h + +cpu/arm920t/start.S: if not relocating, instead of going straight to + stack_setup, jump to done_relocate, which may perform other setup tasks +cpu/arm920t/start.S: after relocating, flush the cache and jump to the new code +include/configs/neo1973.h: remove CONFIG_SKIP_RELOCATE_UBOOT + +- Werner Almesberger <werner@openmoko.org> + +Index: u-boot/cpu/arm920t/start.S +=================================================================== +--- u-boot.orig/cpu/arm920t/start.S ++++ u-boot/cpu/arm920t/start.S +@@ -171,7 +171,7 @@ relocate: /* relocate U-Boot to RAM + adr r0, _start /* r0 <- current position of code */ + ldr r1, _TEXT_BASE /* test if we run from flash or RAM */ + cmp r0, r1 /* don't reloc during debug */ +- beq stack_setup ++ beq done_relocate + + ldr r2, _armboot_start + ldr r3, _bss_start +@@ -181,8 +181,14 @@ relocate: /* relocate U-Boot to RAM + copy_loop: + ldmia r0!, {r3-r10} /* copy from source address [r0] */ + stmia r1!, {r3-r10} /* copy to target address [r1] */ +- cmp r0, r2 /* until source end addreee [r2] */ ++ cmp r0, r2 /* until source end address [r2] */ + ble copy_loop ++ mov r0, #0 /* flush v3/v4 cache */ ++ mcr p15, 0, r0, c7, c7, 0 ++ ldr pc, _done_relocate /* jump to relocated code */ ++_done_relocate: ++ .word done_relocate ++done_relocate: + #else /* NAND_BOOT */ + relocate: + copy_myself: +@@ -270,7 +276,7 @@ notmatch: + 1: b 1b + done_nand_read: + #endif /* NAND_BOOT */ +-#endif /* CONFIG_SKIP_RELOCATE_UBOOT */ ++#endif /* CONFIG_SKIP_RELOCATE_UBOOT */ + + /* Set up the stack */ + stack_setup: +Index: u-boot/include/configs/neo1973_gta01.h +=================================================================== +--- u-boot.orig/include/configs/neo1973_gta01.h ++++ u-boot/include/configs/neo1973_gta01.h +@@ -28,7 +28,6 @@ + + #if defined(BUILD_FOR_RAM) + /* If we want to start u-boot from inside RAM */ +-#define CONFIG_SKIP_RELOCATE_UBOOT 1 + #define CONFIG_SKIP_LOWLEVEL_INIT 1 + #else + /* we want to start u-boot directly from within NAND flash */ |