[U-Boot] Problems with a P2020 board

[Joakim Tjernlund]

>
> Hi.
>
> We have a new board which we are suing with U-boot.  The CPU is a P2020.
> I am having a  few minor problems, and I was hoping to get some help.
>
> -       Boot Count.  We are keen to use the boot counter feature, but I
> am struggling to find a suitable register in the P2020.  The file
> arch/powerpc/lib/bootcount.c list a few locations that work with
> other PowerPC chips, but I can't find any of those registers in the
> P2020 documentation.

Me too on finding such a register.

>
> -       SPI Flash seems very slow.  The SPI flash accesses all seem to be very
> slow.  I can increase the SPI clock (to 40 MHz) and this helps, but the
> real problem is the code in drivers/spi/fsl_espi.c.  Here there is an 80us
> delay after each 32-bit value is written to the TX FIFO.  I don't understand
> why this delay is there?  If I reduce it to 2 usec everything still works, and
> SPI Flash accesses are much faster.  I can easily produce a patch to
> remove or reduce this delay, but I'd rather know why it was there in the
> first place?
>
> -       Timer Interrupts seem to stop.  Once U-boot has started the timer
> interrupts seem to stop.  I have added a test command that prints out
> the timestamp variable (from arch/powerpc/lib/interrupts.c).  I can
> see that when we enter the interactive loop this variable stops
> incrementing.  I can add boot scripts that output this value, and it
> is incrementing until the console becomes interactive.  Has anyone
> else seen a problem like this?

I have but only when running from our BDI2000/BDI3000 emulator. We figured
it was something with the emulator settings but I was never convinced.
If you find out why, please let me know.
Oh, we have a P2010 though.

 Jocke