Problem with MPC5121 custom board.

["CTAG / Moisés Domínguez" <moises.dominguez@ctag.com>]

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.