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On 06/17/2013 10:43 AM, Mark Jackson wrote:
On 13/05/13 19:28, Tom Rini wrote:
From: Steve Kipisz s-kipisz2@ti.com
NOR requires that s_init be within the first 4KiB of the image so that we can perform the rest of the required pinmuxing to talk with the rest of NOR that we are found on. When NOR_BOOT is set we save our environment in NOR at 512KiB and a redundant copy at 768KiB. We avoid using SPL for this case and u-boot.bin is written directly to the start of NOR.
I'm trying to get this up and running our NanoBone platform, but I'm having no success.
Using a non "NOR_BOOT" version, I can boot u-boot and read / write to the NOR device (located at 0x08000000).
So I've compiled my "NOR_BOOT" version and stored it at the start of the flash device.
But when I switch to booting from NOR (rather than SD) I get no output on the serial console.
Using an oscilloscope, I can see the NOR chip select is active for a while (approx 350us), so *something* is trying to boot.
How can I debug such an early part of the boot process ?
Did you copy the parts that setup the pinmuxing in s_init for NOR?
- -- Tom