[U-Boot] [PATCH v2 7/7] am335x_evm: Add support to boot from NOR.

[Tom Rini <trini@ti.com>]

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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
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