[U-Boot] Booting to an alternate bank on an ADS512101?

[U-Boot] Booting to an alternate bank on an ADS512101?

[Timur Tabi]

Hi,

I just got an ADS512101, so I have a few beginner questions on it.

Is it possible to boot to an "alternate" flash bank on this board, like the
"pixis_reset altbank" command does?  I know that jumper P4 is supposed to do a
flash recovery, but that doesn't seem to work for me (I'll email the
manufacturer about that later).  And even if it did, that's not exactly what I
want, since it requires me to physically move the jumpers.

Instead, I'd like to be able to write a new u-boot.bin into some address in NOR
flash, and then reset the board and boot that U-Boot instead.  If for some
reason this U-boot fails, then a hard reset will bring me back to the original
U-Boot.

-- 
Timur Tabi
Linux kernel developer at Freescale

[U-Boot] Booting to an alternate bank on an ADS512101?

[Wolfgang Denk]

Dear Timur Tabi,

In message <4DF29990.9040706@freescale.com> you wrote:
> 
> I just got an ADS512101, so I have a few beginner questions on it.

Which exact board revision is this?

> Is it possible to boot to an "alternate" flash bank on this board, like the
> "pixis_reset altbank" command does?  I know that jumper P4 is supposed to do a

I don't know what "pixis_reset altbank" does, but there is a separate
bank of NOR flash on the mpc5121ads board, which you can select with a
jumper.

> flash recovery, but that doesn't seem to work for me (I'll email the
> manufacturer about that later).  And even if it did, that's not exactly what I
> want, since it requires me to physically move the jumpers.

To switch between the "main" and the "alternate" flash banks you
always have to set/remove the jumper. On this hardware there is no
software way to perform this switching.

> Instead, I'd like to be able to write a new u-boot.bin into some address in NOR
> flash, and then reset the board and boot that U-Boot instead.  If for some
> reason this U-boot fails, then a hard reset will bring me back to the original
> U-Boot.

THis does not work on this hardware. You have to move the jumper.

Alternatively, attach a JTAG debugger...

Best regards,

Wolfgang Denk

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