RE: [beagleboard] Re: TWL4030 intermittent freakout on boot

Woodruff, Richard
2008-05-10T14:57:51Z

Hi,

> A grep of u-boot sources for the OMAP3 EVM does not yield any
> occurrences of twl403 so you might be on to something with this
> theory!

Your SYS_BOOT line values make a difference in TWL behavior. The mask ROM knows specifics about this companion chip.

One aspect people seem to miss is the fact that the mask ROM will touch T2 based on the boot order. The mask ROM also monkeys with some internal clocks and modules.

So, just because your x-loader or u-boot doesn't touch a register that doesn't mean the mask ROM hasn't. So don't expect reset value.

Regards,
Richard W.