I did re-test with mainline 2.6.38-rc2 kernel (plus few patches from Linux-Omap tree / omap-testing branch required for booting the pandaboard on top of .38-rc2).
I was able to reproduce the issue with highmem activated (after 20 minutes or 2hours of native kernel build).
I was not able to reproduce the issue with highmem deactivated and running native kernel builds for more than 60hours.
Attached is the kernel config I was using (with highmem deactivated) to boot a Ubuntu file-system with my 2.6.38-rc2+ kernel.
I did re-test with mainline 2.6.38-rc2 kernel (plus few patches from Linux-Omap tree / omap-testing branch required for booting the pandaboard on top of .38-rc2).
I was able to reproduce the issue with highmem activated (after 20 minutes or 2hours of native kernel build).
I was not able to reproduce the issue with highmem deactivated and running native kernel builds for more than 60hours.
Attached is the kernel config I was using (with highmem deactivated) to boot a Ubuntu file-system with my 2.6.38-rc2+ kernel.