Hi, all!
I am doing porting jobs on GX2(GX-
533@1.1w) + cs5535. I am using OLPC/rev_a
directory as my starting point. I know that OLPC use GX2(GX-
500@1.0w, right??) + cs5536. From POST card i see
the code runs far behind the code of auto.c(src/mainboard/olpc/rev_a/auto.c),
and there should be some information printed from uart1, actually there is none.
As for cs5536, i see cs5536_setup_onchipuart() called
before uart_init(), and i find the MSRs handled in cs5536_setup_onchipuart
do exist in cs5535. So i added a function named cs5535_setup_onchipuart in
cs5535_early_setup.c, and call that functions in auto.c. The same result,
nothing printed from uart1.
I googled related information, i found someone said
we must first loaded VSA before we can use internal uart of cs5535. I have
a little bit understanding on VSA. From my point of view, i see VSA is an auto
tools for OS to access standard x86 compatible registers and ios from not
fully x86 compatible system like cs5535. And i think
cs5535_setup_onchipuart handles accessing msr in cs5535 manually as what VSA
should do and we do not need to firstly load VSA at auto.c. If I were right, why
nothing appears from uart??
Any advice would be well
appreciated.