[U-Boot] Regression due to: arm: Add Prep subcommand support to bootm

[Stephen Warren]

On 04/13/2012 09:07 AM, Tom Rini wrote:
> On Thu, Apr 12, 2012 at 10:52:43AM -0600, Stephen Warren wrote:
> 
>> I just tried the latest u-boot/master, at commit:
>>
>> 3f0675d Merge branch 'marek.vasut at gmail.com' of
>> git://git.denx.de/u-boot-staging
>>
>> This fails to boot a Linux kernel on my ARM Tegra board; the boot log is:
>>
>> ====================
>> ## Booting kernel from Legacy Image at 00408000 ...
>> Image Name: Linux-3.4.0-rc1-next-20120405-00
>> Image Type: ARM Linux Kernel Image (no loading done) (uncompressed)
>> Data Size: 2756424 Bytes = 2.6 MiB
>> Load Address: 00000000
>> Entry Point: 00000000
>> Verifying Checksum ... OK
>> ## Flattened Device Tree blob at 01000000
>> Booting using the fdt blob at 0x01000000
>> XIP Kernel Image (no loading done) ... OK
>> OK
>> Loading Device Tree to 010fa000, end 010ff726 ... OK
>>
>> Starting kernel ...
>>
>> Uncompressing Linux... done, booting the kernel.
>> Warning: Neither atags nor dtb found
>> ====================
>>
>> If I revert commit 0a672d4 "arm: Add Prep subcommand support to bootm",
>> then everything works fine again.
> 
> I don't see this on beagleboard so we'll need some more tracking down of
> just how this broke tegra from you :(  Thanks!

This only seems to affect booting with a device tree. Booting without
passing a device tree works fine.

I also tested "mkimage -T kernel_noload" (which I typically use) vs.
"mkimage -T kernel", and it makes no difference to either DT or non-DT
boots, so that's one potentially unusual thing I do eliminated.