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Fix SDRAM timing on Purple board

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This commit is contained in:
wdenk 2003-05-20 10:39:44 +00:00
parent 66fd3d1ce7
commit 86d82762f6
4 changed files with 77 additions and 3 deletions
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2
CHANGELOG
View file

@ -2,6 +2,8 @@
Changes since U-Boot 0.3.1:
======================================================================
* Fix SDRAM timing on Purple board
* Add support for CompactFlash on ATC board
(includes support for Intel 82365 and compatible PC Card controllers,
and Yenta-compatible PCI-to-CardBus controllers)

5
board/purple/memsetup.S
View file

@ -26,10 +26,13 @@
#include <version.h>
#include <asm/regdef.h>
#define MC_IOGP 0xBF800800
.globl memsetup
memsetup:
li t0, MC_IOGP
li t1, 0xf24
sw t1, 0(t0)
j ra
nop

68
board/purple/purple.c
View file

@ -51,6 +51,69 @@ extern int asc_serial_getc (void);
extern int asc_serial_tstc (void);
extern void asc_serial_setbrg (void);
static void sdram_timing_init (ulong size)
{
register uint pass;
register uint done;
register uint count;
register uint p0, p1, p2, p3, p4;
register uint addr;
#define WRITE_MC_IOGP_1 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+(p4<<8)+(p0<<4)+p3;
#define WRITE_MC_IOGP_2 *(uint *)0xbf800800 = (p1<<14)+(p2<<13)+((p4-16)<<8)+(p0<<4)+p3;
done = 0;
p0 = 2;
while (p0 < 4 && done == 0) {
p1 = 0;
while (p1 < 2 && done == 0) {
p2 = 0;
while (p2 < 2 && done == 0) {
p3 = 0;
while (p3 < 16 && done == 0) {
count = 0;
p4 = 0;
while (p4 < 32 && done == 0) {
WRITE_MC_IOGP_1;
for (addr = KSEG1 + 0x4000;
addr < KSEG1ADDR (size);
addr = addr + 4) {
*(uint *) addr = 0xaa55aa55;
}
pass = 1;
for (addr = KSEG1 + 0x4000;
addr < KSEG1ADDR (size) && pass == 1;
addr = addr + 4) {
if (*(uint *) addr != 0xaa55aa55)
pass = 0;
}
if (pass == 1) {
count++;
} else {
count = 0;
}
if (count == 32) {
WRITE_MC_IOGP_2;
done = 1;
}
p4++;
}
p3++;
}
p2++;
}
p1++;
}
p0++;
if (p0 == 1)
p0++;
}
}
long int initdram(int board_type)
{
@ -64,6 +127,11 @@ long int initdram(int board_type)
int rows = (cfgpb0 & 0xF0) >> 4;
int dw = cfgdw & 0xF;
ulong size = (1 << (rows + cols)) * (1 << (dw - 1)) * CFG_NB;
void (* sdram_init) (ulong);
sdram_init = (void (*)(ulong)) KSEG0ADDR(&sdram_timing_init);
sdram_init(0x10000);
return size;
}

5
include/configs/purple.h
View file

@ -150,7 +150,8 @@
* Temporary buffer for serial data until the real serial driver
* is initialised (memtest will destroy this buffer)
*/
#define CFG_SCONSOLE_ADDR CFG_SDRAM_BASE
#define CFG_SCONSOLE_SIZE 0x0002000
#define CFG_SCONSOLE_ADDR (CFG_SDRAM_BASE + CFG_INIT_SP_OFFSET - \
CFG_DCACHE_SIZE / 2)
#define CFG_SCONSOLE_SIZE (CFG_DCACHE_SIZE / 4)
#endif /* __CONFIG_H */