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-rw-r--r--src/cpu/amd/sc520/raminit.c107
-rw-r--r--src/mainboard/digitallogic/msm586seg/auto.c4
2 files changed, 98 insertions, 13 deletions
diff --git a/src/cpu/amd/sc520/raminit.c b/src/cpu/amd/sc520/raminit.c
index 30938d26cc..c04d9e98ce 100644
--- a/src/cpu/amd/sc520/raminit.c
+++ b/src/cpu/amd/sc520/raminit.c
@@ -54,7 +54,7 @@
#define drcmctl (( volatile unsigned char *)0xfffef012)
#define drccfg (( volatile unsigned char *)0xfffef014)
-#define drcbendadr (( volatile unsigned char *)0xfffef018)
+#define drcbendadr (( volatile unsigned long *)0xfffef018)
#define eccctl (( volatile unsigned char *)0xfffef020)
#define dbctl (( volatile unsigned char *)0xfffef040)
void
@@ -71,11 +71,20 @@ setupsc520(void){
/* no, that did not help. I wonder what will?
* outl(0x800df0cb, 0xfffc);
*/
+ /* well, this is special! You have to do SHORT writes to the locations,
+ * even though they are CHAR in size and CHAR aligned and technically, a
+ * SHORT write will result in -- yoo ha! -- over writing the next location!
+ * Thanks to the u-boot guys for a reference code I can use.
+ * with these short pointers, it now reliably comes up after power cycle
+ * with printk. Ah yi yi.
+ */
/* turn off the write buffer*/
- cp = (unsigned char *)0xfffef040;
- *cp = 0;
+ /* per the note above, make this a short? Let's try it.
+ */
+ sp = (unsigned short *)0xfffef040;
+ *sp = 0;
/* byte writes in AMD assembly */
/* we do short anyway, since u-boot does ... */
@@ -243,7 +252,18 @@ static void dumpram(void){
print_err("bendadr2 "); print_err_hex8(*drcbendadr); print_err("\r\n");
print_err("bendadr3"); print_err_hex8(*drcbendadr); print_err("\r\n");
}
-#ifdef FUCK
+
+/* there is a lot of silliness in the amd code, and it is
+ * causing romcc real headaches, so we're going to be be a little
+ * less silly.
+ * so, the order of ops is:
+ * for in 3 to 0
+ * see if bank is there.
+ * if we can write a word, and read it back, to hell with paranoia
+ * the bank is there. So write the magic byte, read it back, and
+ * use that to get size, etc. Try to keep things very simple,
+ * so people can actually follow the damned code.
+ */
/* cache is assumed to be disabled */
int sizemem(void)
@@ -251,25 +271,87 @@ int sizemem(void)
int rows,banks, cols, i, bank;
unsigned char al;
-
+ volatile unsigned long *lp = (volatile unsigned long *) CACHELINESZ;
+ unsigned long l;
/* initialize dram controller registers */
*dbctl = 0; /* disable write buffer/read-ahead buffer */
*eccctl = 0;
*drcmctl = 0x1e; /* Set SDRAM timing for slowest speed. */
+ /* setup dram register for all banks
+ * with max cols and max banks
+ */
+ *drccfg=0xbbbb;
/* setup loop to do 4 external banks starting with bank 3 */
- print_err("sizemem\n");
+ *drcbendadr=0x0ff000000;
+ /* issue a NOP to all DRAMs */
+ /* Setup DRAM control register with Disable refresh,
+ * disable write buffer Test Mode and NOP command select
+ */
+ *drcctl=0x01;
+
+ /* dummy write for NOP to take effect */
+ dummy_write();
+ print_err("NOP\n");
+ /* 100? 200? */
+ //sc520_udelay(100);
+ print_err("after sc520_udelay\r\n");
+
+ /* issue all banks precharge */
+ *drcctl=0x02;
+ print_err("set *drcctl to 2 \r\n");
+ dummy_write();
+ print_err("PRE\n");
+
+ /* issue 2 auto refreshes to all banks */
+ *drcctl=0x04;
+ dummy_write();
+ print_err("AUTO1\n");
+ dummy_write();
+ print_err("AUTO2\n");
+
+ /* issue LOAD MODE REGISTER command */
+ *drcctl=0x03;
+ dummy_write();
+ print_err("LOAD MODE REG\n");
+
+ *drcctl=0x04;
+ for (i=0; i<8; i++) /* refresh 8 times */{
+ dummy_write();
+ print_err("dummy write\r\n");
+ }
+ print_err("8 dummy writes\n");
+ /* set control register to NORMAL mode */
+ *drcctl=0x00;
+ print_err("normal\n");
+
+ print_err("HI done normal\r\n");
+
+ print_err("sizemem\n");
+ for(bank = 3; bank >= 0; bank--) {
+ print_err("Try to assign to l\r\n");
+ *lp = 0xdeadbeef;
+ print_err("assigned l ... \r\n");
+ if (*lp != 0xdeadbeef) {
+ print_err(" no memory at bank ");
+ // print_err_hex8(bank);
+ // print_err(" value "); print_err_hex32(*lp);
+ print_err("\r\n");
+ // continue;
+ }
+ l = *drcbendadr;
+ l >>= 8;
+ *drcbendadr = l;
+ print_err("loop around\r\n");
+ }
+#if 0
/* enable last bank and setup ending address
* register for max ram in last bank
*/
*drcbendadr=0x0ff000000;
- /* setup dram register for all banks
- * with max cols and max banks
- */
- *drccfg=0xbbbb;
// dumpram();
@@ -499,10 +581,11 @@ bad_ram:
goto bad_reinit;
while(1)
print_err("DONE NEXTBANK\r\n");
-}
#endif
-/* note: based on AMD code, but AMD code is BROKEN AFAIK */
+}
+/* note: based on AMD code, but AMD code is BROKEN AFAIK */
+/* this does now work worth shit. */
int
staticmem(void){
volatile unsigned char *zero = (unsigned char *) 0;
diff --git a/src/mainboard/digitallogic/msm586seg/auto.c b/src/mainboard/digitallogic/msm586seg/auto.c
index 68013f87ee..c688569821 100644
--- a/src/mainboard/digitallogic/msm586seg/auto.c
+++ b/src/mainboard/digitallogic/msm586seg/auto.c
@@ -53,8 +53,10 @@ static void main(unsigned long bist)
console_init();
// while(1)
print_err("HI THERE!\r\n");
-// sizemem();
+ sizemem();
// staticmem();
+
+ while(1)
print_err("STATIC MEM DONE\r\n");
#if 0