Re: [PATCH] MTD for Taco

On Tuesday 15 January 2008, Sean MacLennan wrote:

Stefan Roese wrote:

quoted

Right. One thing I noticed though is, that you map the NAND to
0xd0000000, which is reserved for PCI in the 440EP address space. I
suggest you map it to 0x90000000 as done on Bamboo. Please give it a try
and let me know if this changes the 32bit access behavior.

I think I changed it right. The following code is obviously a hack:

static int warp_setup_nand_flash(void)
{
	unsigned data;

	mfebc(0x1, data);
	printk("EBC0_B1CR %x\n", data); // SAM DBG

	data = 0x9001c000;
	mtebc(0x1, data);

	mfebc(0x1, data);
	printk("after EBC0_B1CR %x\n", data); // SAM DBG

	mfebc(0x11, data);
	printk("EBC0_B1AP %x\n", data); // SAM DBG

	platform_device_register(&warp_ndfc_device);
	platform_device_register(&warp_nand_device);

	return 0;
}
device_initcall(warp_setup_nand_flash);


Then change the NAND base offset to 90000000. This change made no
difference. It still works with 8-bit access and fails with 32-bit. The
mtebc and mfebc macros where taken from u-boot.

Bummer! Was worth a try though. I still don't see why this should fail on your 
platform. What error/exception do you get upon 32bit access btw?

Best regards,
Stefan

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