diff options
Diffstat (limited to 'cpu/i386/sc520_asm.S')
| -rw-r--r-- | cpu/i386/sc520_asm.S | 52 |
1 files changed, 50 insertions, 2 deletions
diff --git a/cpu/i386/sc520_asm.S b/cpu/i386/sc520_asm.S index 80464fa78b..8fc713d93b 100644 --- a/cpu/i386/sc520_asm.S +++ b/cpu/i386/sc520_asm.S @@ -113,6 +113,7 @@ .equ DRCCFG, 0x0fffef014 /* DRAM bank configuration register */ .equ DRCBENDADR, 0x0fffef018 /* DRAM bank ending address register */ .equ ECCCTL, 0x0fffef020 /* DRAM ECC control register */ +.equ ECCINT, 0x0fffefd18 /* DRAM ECC nmi-INT mapping */ .equ DBCTL, 0x0fffef040 /* DRAM buffer control register */ .equ CACHELINESZ, 0x00000010 /* size of our cache line (read buffer) */ @@ -459,6 +460,12 @@ emptybank: incl %edi loop cleanuplp +#if defined CFG_SDRAM_DRCTMCTL + /* just have your hardware desinger _GIVE_ you what you need here! */ + movl $DRCTMCTL, %edi + movb $CFG_SDRAM_DRCTMCTL,%al + movb (%edi), %al +#else #if defined(CFG_SDRAM_CAS_LATENCY_2T) || defined(CFG_SDRAM_CAS_LATENCY_3T) /* set the CAS latency now since it is hard to do * when we run from the RAM */ @@ -472,6 +479,7 @@ emptybank: #endif movb %al, (%edi) #endif +#endif movl $DRCCTL, %edi /* DRAM Control register */ movb $0x3,%al /* Load mode register cmd */ movb %al, (%edi) @@ -528,9 +536,49 @@ bank0: movl (%edi), %eax shll $22, %eax movl %eax, %ebx -done: movl %ebx, %eax +done: + movl %ebx, %eax + +#if CFG_SDRAM_ECC_ENABLE + /* A nominal memory test: just a byte at each address line */ + movl %eax, %ecx + shrl $0x1, %ecx + movl $0x1, %edi +memtest0: + movb $0xa5, (%edi) + cmpb $0xa5, (%edi) + jne out + shrl $1, %ecx + andl %ecx,%ecx + jz set_ecc + shll $1, %edi + jmp memtest0 + +set_ecc: + /* clear all ram with a memset */ + movl %eax, %ecx + xorl %esi, %esi + xorl %edi, %edi + xorl %eax, %eax + shrl $2, %ecx + cld + rep stosl + /* enable read, write buffers */ + movb $0x11, %al + movl $DBCTL, %edi + movb %al, (%edi) + /* enable NMI mapping for ECC */ + movl $ECCINT, %edi + mov $0x10, %al + movb %al, (%edi) + /* Turn on ECC */ + movl $ECCCTL, %edi + mov $0x05, %al + movb %al, (%edi) +#endif +out: + movl %ebx, %eax jmp *%ebp - #endif /* CONFIG_SC520 */ |