I'm porting support for a Phytec PCM030 (mpc5200) from 1.2 up to
current head so that I can get it merged. These boards can be
populated with a variety of flash chips, there is code to compute the
size of these chips and fix up bank_base[] in cfi_flash.c In u-boot
1.3.4 bank_base[] was rewritten. What is the correct way to do these
calculations?
extern ulong bank_base[CFG_MAX_FLASH_BANKS];
int board_early_init_r (void)
{
int width, id;
ulong mb, dev_size;
ulong base = 0xff000000;
ulong lpb;
lpb = *(vu_long *)MPC5XXX_LPB;
*(vu_long *)MPC5XXX_BOOTCS_START = START_REG(base);
*(vu_long *)MPC5XXX_BOOTCS_STOP = STOP_REG(base, 16 * 1024 * 1024);
/*
* we run the PCI bus with 33 1/3 MHz. The flash requires 75ns
accesstime.
* 2 base waitstates plus one additional waitstate makes the access as
fast
* as possible (=90ns)
*/
lpb &= 0x0000dfc0; /* make it writable and mask out wait stages */
lpb |= 0x0001d000; /* adjust wait stages */
*(vu_long *)MPC5XXX_LPB = lpb;
/* get flash width */
width = (lpb >> 8) & 0x3;
switch (width) {
case 0: /* 8 bit */
*(vu_char *)base = 0x90;
id = *(vu_char *)(base + 3);
*(vu_char *)base = 0xff;
break;
case 1: /* 16 bit */
*(vu_short *)base = 0x90;
id = *(vu_short *)(base + 2) & 0xff;
*(vu_short *)base = 0xff;
break;
case 3: /* 32 bit */
*(vu_short *)base = 0x90;
id = *(vu_short *)(base + 4) & 0xff;
*(vu_short *)base = 0xff;
break;
}
switch (id) {
case 0x16:
mb = 4;
break;
case 0x17:
mb = 8;
break;
case 0x18:
mb = 16;
break;
case 0x20:
mb = 8;
break;
case 0x21:
mb = 16;
break;
case 0x22:
mb = 32;
break;
}
/* On these boards everything which is 32bit wide consists
* of two 16bit Flashes
*/
if (width == 3)
mb <<= 1;
/*
* On this platform one chip select can only handle up to 32MiB.
* So we must limit boot cs's baseaddress to 0xfe000000 and above
*/
if (mb > 32)
dev_size = 32;
else
dev_size = mb;
*(vu_long *)MPC5XXX_BOOTCS_START = START_REG(0x0u - (dev_size << 20));
*(vu_long *)MPC5XXX_BOOTCS_STOP = STOP_REG(0x0u - (dev_size << 20),
(dev_size << 20));
/*
* the developer is responsible to setup other chip select lines to
* reach other parts of the device if its larger than 32MiB
*/
bank_base[0] = 0x0u - (mb << 20);
return 0;
}
--
Jon Smirl
jonsm...@gmail.com
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