Re: 4430SDP boot failure - solved + SPI bug fix

Russell King - ARM Linux
2011-01-07T18:53:00Z

On Fri, Jan 07, 2011 at 11:55:10PM +0530, Santosh Shilimkar wrote:
> > And, with one ARM errata disabled, the kernel finally boots. So the
> > "X-Loader hangs" message means that we did something that non-secure
> > mode prevented us from doing.
> >
> Actually it's not. The error message is quite misleading. Basically in
> x-loader exception handlers are setup and all these handlers report
> same message ("X-Loader hangs"). This should be fixed so that it can
> report more meaningful info like data abort, prefetch abort etc.
>
> Till the vector relocation in the kernel exceptions are not set up
> so code jumps to already installed exceptions in the x-loader and
> hence the messege.

I disagree with your "actually it's not". It was errata 742230, which
requires access to the CP15, c15, c0, 1 register (a diagnostic register)
which I bet provokes an undefined instruction trap from non-secure mode.

Hence, the reason it vectored to the X-loader was because we tried to
do something in the non-secure mode which we're prevented from doing.