For omap34/35xx class hardware definitely turn on CONFIG_ARM_ERRATA_430973=y
When using a mix of arm/thumb application binaries on this core.....
I can confirm that this fixed my problem. The other two errata seem to have no noticeable effect, e.g. not using them doesn't cause crashes, having them doesn't break anything.
Thanks Robert. Do you know of any references for these errata beyond just the kernel config. descriptions?
Ash, would you be willing to ask TI through Gumstix?
Thanks, Jon