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 34b07d8..97dd757 100644 --- a/arch/microblaze/cpu/start.S +++ b/arch/microblaze/cpu/start.S @@ -50,8 +50,10 @@ _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 */