I am trying to write a UBL that accesses the SD card.
I am turning on mmc0 in the PSC using the following code:
=====================================
/* ---------------------------------------------- */
/* initialize SD card */
/* ---------------------------------------------- */
stillson: /* just added for a break point*/
/* if (ptstat & 1 == 1) goto mmc_pstat_loop1 */
ldr r0, PTSTAT
mmc_ptstat_loop1: /* wait for something! */
ldr r2, [r0]
tst r2, $0x01
bne mmc_ptstat_loop1
#if 0
/* if (mdstat_mmc & 0x1f == 0x03) goto mmc_is_on */
ldr r0, MDSTAT_MMC
ldr r1, [r0]
and r1, r1, $0x1f
teq r1, $0x03
beq mmc_is_on
#endif
/* MDCTL_MMC |= 0x03 */
ldr r1, MDCTL_MMC
ldr r2, [r1]
and r2, r2, $0xfffffff8
orr r2, r2, $0x03
str r2, [r1]
/* PTCMD = 1 */
ldr r1, PTCMD
mov r2, $0x01
str r2, [r1]
ldr r0, PTSTAT
mmc_ptstat_loop2:
/* if (ptstat == 1) goto mmc_ptstat_loop2 */
ldr r2, [r0]
tst r2, $0x01
bne mmc_ptstat_loop2
ldr r0, MDSTAT_MMC
mmc_mdstat_loop:
/* if ( (mdstat_mmc & 0x1f) != 0x03 ) goto mmc_mdstat_loop*/
ldr r2, [r0]
and r2, r2, $0x1f
teq r2, $0x03
bne mmc_mdstat_loop
mmc_is_on:
nop
MDCTL_MMC:
.word 0x01c41a3c
MDSTAT_MMC:
.word 0x01c4183c
PTCMD:
.word 0x01c41120
PTSTAT:
.word 0x01c41128
================================
Later, when I go to access the mmc0 registers at 0x01e11000, they are
all 0x00000000
This happens whether I run the code to turn it on or not.
The MDSTAT[15] seems to say that it is disabled (not syncReset as the
documentation says). ( I am set to nand boot, although I load the UBL
over jtag)
Does using jtag affect this?
Why are the mmc0 registers blank?
Chris
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