Problem with MPC5121 custom board.

Problem with MPC5121 custom board.

[CTAG / Moisés Domínguez]

Hi all,

We have a problem with custom design based on ads5121. May be you could
provide us any clue about what may be happening.

Sometimes, when the board is powered-on:

- U-boot does not start (at least serial port does not output anything, =
I
don't know if some piece of u-boot is executed).
- LPC_DIV and IPS_DIV are not configured so u-boot does not reach this =
point
either.
- The only way to get the board run once reached this point is power-off =
and
power-on again (That's: 3.3V, 1.8V. 1.4V).
- If we only turn-off 1.8V and 1.4V that's not enough to get the board
working.

When this happens we:

- Measured lpc_clock which is running at 33 MHZ so PLLs are working so =
reset
word is being read right.
- Measured all voltages (3.3V, 1.8V. 1.4V) and are OK.
- We read RCWL and RCWH with JTAG and have the value we expect.
- Could erase the flash with JTAG but we couldn't reprogram it.

We don't know what else to test in order to detect where the problem is. =
We
suppose that, as the only way to run again is reset the 3.3V, there must =
be
any peripheral that is not being working properly, but we don't know how =
to
find it and why this is happening.

Some clue is much appreciated.

Regards,

Moises.

Re: Problem with MPC5121 custom board.

[Wolfgang Denk]

Dear =?iso-8859-1?Q?CTAG_/_Mois=E9s_Dom=EDnguez?=,

In message <765B188B547A48E7951D86ACC3544C54@ctag> you wrote:
> 
> We have a problem with custom design based on ads5121. May be you could
> provide us any clue about what may be happening.
> 
> Sometimes, when the board is powered-on:
> 
> - U-boot does not start (at least serial port does not output anything, I
> don't know if some piece of u-boot is executed).

In an overwhelming majority of such cases this is an indication of
incorrect and/or incomplete initialization of your system RAM. See the
FAQ at http://www.denx.de/wiki/view/DULG/UBootCrashAfterRelocation

Note that U-Boot related questions (and this is one) should better go
to the U-Boot mailing list instead (see
http://lists.denx.de/mailman/listinfo/u-boot)

Best regards,

Wolfgang Denk

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