Update for SC520 board.
Patch by David Updegraff, 02 Dec 2005
diff --git a/cpu/i386/sc520.c b/cpu/i386/sc520.c
index c83f0bb..1c4370b 100644
--- a/cpu/i386/sc520.c
+++ b/cpu/i386/sc520.c
@@ -31,7 +31,9 @@
#include <common.h>
#include <config.h>
#include <pci.h>
+#ifdef CONFIG_SC520_SSI
#include <ssi.h>
+#endif
#include <asm/io.h>
#include <asm/pci.h>
#include <asm/ic/sc520.h>
@@ -143,7 +145,15 @@
u32 dram_present=0;
u32 dram_ctrl;
-
+#ifdef CFG_SDRAM_DRCTMCTL
+ /* these memory control registers are set up in the assember part,
+ * in sc520_asm.S, during 'mem_init'. If we muck with them here,
+ * after we are running a stack in RAM, we have troubles. Besides,
+ * these refresh and delay values are better ? simply specified
+ * outright in the include/configs/{cfg} file since the HW designer
+ * simply dictates it.
+ */
+#else
int val;
int cas_precharge_delay = CFG_SDRAM_PRECHARGE_DELAY;
@@ -162,6 +172,7 @@
} else {
val = 3; /* 62.4us */
}
+
write_mmcr_byte(SC520_DRCCTL, (read_mmcr_byte(SC520_DRCCTL) & 0xcf) | (val<<4));
val = read_mmcr_byte(SC520_DRCTMCTL);
@@ -181,13 +192,12 @@
val |= 1;
}
write_mmcr_byte(SC520_DRCTMCTL, val);
-
+#endif
/* We read-back the configuration of the dram
* controller that the assembly code wrote */
dram_ctrl = read_mmcr_long(SC520_DRCBENDADR);
-
bd->bi_dram[0].start = 0;
if (dram_ctrl & 0x80) {
/* bank 0 enabled */
@@ -274,7 +284,7 @@
{
int i;
-# if 0
+# if 1
printf("set_irq(): map INT%c to IRQ%d\n", pci_pin + 'A', irq);
#endif
if (irq < 0 || irq > 15) {
diff --git a/cpu/i386/sc520_asm.S b/cpu/i386/sc520_asm.S
index 80464fa..e1fa37a 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 @@
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 */
@@ -470,7 +477,8 @@
#ifdef CFG_SDRAM_CAS_LATENCY_3T
orb $0x10, %al
#endif
- movb %al, (%edi)
+ movb %al, (%edi)
+#endif
#endif
movl $DRCCTL, %edi /* DRAM Control register */
movb $0x3,%al /* Load mode register cmd */
@@ -528,9 +536,49 @@
shll $22, %eax
movl %eax, %ebx
-done: movl %ebx, %eax
- jmp *%ebp
+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 */