[U-Boot-Users] 834x UPM Read access RAM Array (stuck?).

[Timur Tabi <timur@freescale.com>]

Marc Leeman wrote:
> I'm trying to program the UPM A on the 8347E processor. Next to having
> bus errors while writing from Linux (RAM words for HPI are not correct
> yet, but that's something I have to figure out), I'm having problems
> with reading the RAM words back out for testing/debugging/verification.

Looks to me like you're having an out-of-order problem.

I wrote a version of your function some time ago, and included it in the set 
of changes for the 83xx tree that was made available to Wolfgang a few weeks 
ago, but he hasn't pulled them yet.  You can find those changes here:

http://opensource.freescale.com/git?p=u-boot-83xx.git;a=summary

For your convenience, here's the upmconfig() function I wrote:

void upmconfig (uint upm, uint *table, uint size)
{
#if defined(CONFIG_MPC834X)
	volatile immap_t *immap = (immap_t *) CFG_IMMR;
	volatile lbus83xx_t *lbus = &immap->lbus;
	volatile uchar *dummy = NULL;
	const u32 msel = (upm + 4) << BR_MSEL_SHIFT;	/* What the MSEL field in BRn 
should be */
	volatile u32 *mxmr = &lbus->mamr + upm;	/* Pointer to mamr, mbmr, or mcmr */
	uint i;

	/* Scan all the banks to determine the base address of the device */
	for (i = 0; i < 8; i++) {
		if ((lbus->bank[i].br & BR_MSEL) == msel) {
			dummy = (uchar *) (lbus->bank[i].br & BR_BA);
			break;
		}
	}

	if (!dummy) {
		printf("Error: %s() could not find matching BR\n", __FUNCTION__);
		hang();
	}

	/* Set the OP field in the MxMR to "write" and the MAD field to 000000 */
	*mxmr = (*mxmr & 0xCFFFFFC0) | 0x10000000;

	for (i = 0; i < size; i++) {
		lbus->mdr = table[i];
		__asm__ __volatile__ ("sync");
		*dummy;	/* Write the value to memory and increment MAD */
		__asm__ __volatile__ ("sync");
	}

	/* Set the OP field in the MxMR to "normal" and the MAD field to 000000 */
	*mxmr &= 0xCFFFFFC0;
#else
	printf("Error: %s() not defined for this configuration.\n", __FUNCTION__);
	hang();
#endif
}

-- 
Timur Tabi
Linux Kernel Developer @ Freescale