RE: MPC5200B SPI codec error when there is a heavy ethernet

Hi all,=20

The engineers of Freescale have recognized a problem in the PSC SPI =
Slave Select signal when there is a heavy ethernet loading. Textually =
they say:

" I have tested the MPC5200B FEC and PSC6 SPI.=20
You are right. If there is heavy Ethernet loading, the PSC SPI can stop =
during transmission with SS goes high.
Use a general-purpose output as SPI slave select signal instead PSC SPI =
SS signal.
Factory is informed about similar incorrect behaviour of the PSC SPI =
slave select."

We have repeated the error in three scenarios:
	In our MPC5200B custom board with a Denx 2.4.25 kernel.
	In a Lite5200B with a Denx 2.4.25 kernel.
	In a Lite5200B with the freescale bsp: =
mpc5200_lite5200b_20070203_ltib-rc4. It's a 2.6.16 kernel version.

We have checked the PSC3 and PSC6 and the behaviour is the same.

So, it seems is a chip's bug and we must avoid to use the SS signal with =
the PSC SPI if we want to communicate by ethernet. I think it's a =
probabilistic error and in case there is some traffic in ethernet and a =
transmission by SPI at the same time it could happen.


Best regards,
Txema L=F3pez.

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