[U-Boot] Ethernet on PandaBoard

Gary Thomas
2012-07-11T15:13:31Z

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.