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Still not working quite right. Fails badly on 256MB sdram.

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This commit is contained in:
Ronald G. Minnich 2001-03-21 20:38:02 +00:00
commit 57b654be4e
1 changed files with 21 additions and 7 deletions
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28
src/northbridge/acer/m1631/ipl.S
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@ -40,7 +40,10 @@ it with the version available from LANL.
* set the right value.
*/
#define INIT_MCR $0xf6621000
#define WRITE_MCR0 movl %ecx, %eax ; outl %eax, %dx
#define WDELAY movw $0x1000, ax; 1: dec %ax; jnz 1b
#undef WDELAY
#define WDELAY outb %al, %dx; jmp 1f; 1: outb %al, %dx
#define WRITE_MCR0 movl %ecx, %eax ; outl %eax, %dx ; WDELAY
/*#include <cpu/p5/start32.inc>*/
.org 0xfe000
.code16
@ -142,6 +145,8 @@ code16
movb $0xfc, %dl
movl $0xf662f83c, %ecx
WRITE_MCR0
// Not only does this not work, it screws up the programming.
#if 0
/* check for registered. All this means is write to 0,
* read back, if it's not the same, set 'registered',
* read back, it it's the same you're ok.
@ -156,23 +161,27 @@ code16
CALLSP(pci_write_dword)
*/
nonregistered:
#endif
rorl $16, %ecx
/* clear out the CAS, since we assume start at zero
* and increment
*/
andb $0xf0, %cl
/* test 8 bit CAS */
movl $0x800, %esi
movb $0, (%edi)
movb $1, 0x800
movb $1, (%esi) // esi is at 0x800
cmpb $0,(%edi)
jnz sizeram
inc %cl
roll %esi
/* change the value we store each time. It makes debugging easier */
movb $2, 0x1000
movb $2, (%esi) // esi is at 0x1000
cmpb $0, (%edi)
jnz sizeram
inc %cl
movb $3, 0x2000
roll %esi
movb $3, (%esi) // esi is at 0x2000
cmpb $0, (%edi)
jnz sizeram
inc %cl
@ -195,6 +204,8 @@ sizeram:
/* clear the size out to 4 MB */
andb $0xf8, %cl
/* 4 MB */
// esi is at 0x2000 at this point. To get to 0x400000,
// roll it 13 bits
movl $0x400000, %esi
1:
#ifdef USE_BIG_REAL
@ -227,10 +238,13 @@ sizeram:
* Just set 4-bank mode, and set non-zero numbers into a few places.
* if the byte at 0 changes, you have two banks. Trivial.
*/
movl $0x1000, %esi
movb $0, (%edi)
movb $5, 0x1000
movb $6, 0x2000
movb $7, 0x4000
movb $5, (%esi)
roll $1, %esi
movb $6, (%esi)
roll $1, %esi
movb $7, (%esi)
cmpb $0, (%edi)
jz 1f /* 4 banks */
orl $0x80000, %ecx