[U-Boot] [PATCH 18/26] microblaze: Save and restore first unused vector

Michal Simek
2011-09-13T07:10:13Z

Use one memory space to detect little/big endian platforms.
The first unused address(0x28) is used instead 0x0 address (reset vectors).
Detection rewrited reset vector setup from first stage bootloader.

Workflow:
1. Store 0x28 to r7
2. Do little/big endian test
3. Restore r7 to 0x28

Signed-off-by: Michal Simek <monstr@monstr.eu>
---
arch/microblaze/cpu/start.S | 6 ++++--
1 files changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/microblaze/cpu/start.S b/arch/microblaze/cpu/start.S
index 17c0e28..42104fa 100644
--- a/arch/microblaze/cpu/start.S
+++ b/arch/microblaze/cpu/start.S
@@ -51,8 +51,10 @@ _start:
* 4b) BIG endian - r10 contains 0x0 because 0x2 offset is on addr 0x3
*/
addik r6, r0, 0x2 /* BIG/LITTLE endian offset */
- swi r6, r0, 0
- lbui r10, r0, 0
+ lwi r7, r0, 0x28
+ swi r6, r0, 0x28 /* used first unused MB vector */
+ lbui r10, r0, 0x28 /* used first unused MB vector */
+ swi r7, r0, 0x28

/* add opcode instruction for 32bit jump - 2 instruction imm & brai */
addi r2, r0, 0xb0000000 /* hex b000 opcode imm */
--
1.5.5.6