diff options
| author | Sven Schnelle <svens@stackframe.org> | 2012-06-17 14:23:35 +0200 |
|---|---|---|
| committer | Sven Schnelle <svens@stackframe.org> | 2012-06-18 09:03:35 +0200 |
| commit | 1a7a7e610e0fbc54fcc802bedbb31673dffff449 (patch) | |
| tree | 89b38df2cd6c713ca41948ab03f58d99d3588b9f /src/northbridge/intel/i5000/halt_second_bsp.S | |
| parent | ec6f043c253355483bd065c39adc91bad2647ee9 (diff) | |
i5000: enforce hard reset
Not doing a hard reset leaves the BOFL0 register cleared, which
prevents the BSP selection from working. To make sure we start
with known values, use the SPAD0 register for soft reset detection.
If there's a value other than 0, do a hard reset.
Change-Id: I390e3208084cfd32d73cce439ddf2bc9d4436a62
Signed-off-by: Sven Schnelle <svens@stackframe.org>
Reviewed-on: http://review.coreboot.org/1103
Tested-by: build bot (Jenkins)
Diffstat (limited to 'src/northbridge/intel/i5000/halt_second_bsp.S')
| -rw-r--r-- | src/northbridge/intel/i5000/halt_second_bsp.S | 31 |
1 files changed, 30 insertions, 1 deletions
diff --git a/src/northbridge/intel/i5000/halt_second_bsp.S b/src/northbridge/intel/i5000/halt_second_bsp.S index a1a1b156db..2dc533ac53 100644 --- a/src/northbridge/intel/i5000/halt_second_bsp.S +++ b/src/northbridge/intel/i5000/halt_second_bsp.S @@ -2,6 +2,26 @@ movl %eax, %ebp + /* check if SPAD0 is cleared. If yes, it means this was a hard reset */ + movl $0x800080d0, %eax + movw $0xcf8, %dx + outl %eax, %dx + + addw $4, %dx + inl %dx, %eax + cmp $0, %eax + je no_reset + + /* perform hard reset */ + movw $0xcf9, %dx + movw $0x06, %ax + outw %ax, %dx + +loop0: hlt + jmp loop + +no_reset: + /* Read the semaphore register of i5000 (BOFL0). If it returns zero, it means there was already another read by another CPU */ @@ -25,5 +45,14 @@ loop: hlt jmp loop -1: /* Restore BIST */ +1: /* set magic value for soft reset detection */ + movl $0x800080d0, %eax + movw $0xcf8, %dx + outl %eax, %dx + + addw $4, %dx + movl $0x12345678, %eax + outl %eax, %dx + + /* Restore BIST */ mov %ebp, %eax |