[U-Boot] Ethernet on PandaBoard

[Gary Thomas]

On 2012-07-11 07:08, Gary Thomas wrote:
> I just tried rev 211e47549b668c7cdd8658c0413a272f0d0495d4 (v2012.07-rc1)
> for my PandaBoard.  Sadly, this is failing when I try to use the onboard
> ethernet (EHCI USB based) controller:
>
> U-Boot SPL 2012.07-rc1 (Jul 11 2012 - 06:56:00)
> OMAP4430 ES2.2
> OMAP SD/MMC: 0
> reading u-boot.img
> reading u-boot.img
>
>
> U-Boot 2012.07-rc1 (Jul 11 2012 - 06:56:00)
>
> CPU  : OMAP4430 ES2.2
> Board: OMAP4 Panda
> I2C:   ready
> DRAM:  1 GiB
> MMC:   OMAP SD/MMC: 0
> Using default environment
>
> In:    serial
> Out:   serial
> Err:   serial
> Net:   No ethernet found.
> Hit any key to stop autoboot:  0
> Panda # usb start
> (Re)start USB...
> USB:   Register 1313 NbrPorts 3
> data abort
> pc : [<bff9acb0>]          lr : [<bff9ac91>]
> sp : bff08e28  ip : 0000000f     fp : 00000000
> r10: bff0a370  r9 : 00000002     r8 : bff08f68
> r7 : bffbb070  r6 : 00000000     r5 : bffaee04  r4 : 00001313
> r3 : bffaee04  r2 : 98000000     r1 : 0000000a  r0 : 00000019
> Flags: Nzcv  IRQs off  FIQs off  Mode SVC_32
> Resetting CPU ...
>
> Anyone else see this?  Ideas?
>
> How do I map these addresses (PC=0xbff9acb0) to the ones in my
> u-boot ELF image (so I can figure out what went wrong)?
>
> Thanks
>

This turns out to be related to access to the wHubCharacteristics
field in a hub descriptor.  This field is u16, but not u16 aligned,
hence the data abort.

Has something changed recently?  I have a version of U-Boot built
for this board based on 2011.06 from the meta-ti tree which does
not suffer from these problems.

-- 
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Gary Thomas                 |  Consulting for the
MLB Associates              |    Embedded world
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