I've seen that MPC8555 support also made it into linux-2.6 by now. I don't have hardware and time to test, but it looks like this bug has made it over from the linuxppc-2.4 tree. The 8541/8555 has a smaller CPM DPRAM than the standard CPM2, just like the 8272.
Unfortunately, the manual recommends you to use a segment of CPM DPRAM that is not implemented in the 8541/55. If the smaller DPRAM is not taken into account, fcc_enet.c will initialise the internal CPM buffer pointers (fcc_riptr/fcc_tiptr) to invalid offsets, with the result that all the FCC will ever send and receive are 0xff-en. See also "All-ones problem with FCC1 on MPC8541" ~October 2004 on linuxppc-embedded. Signed-off-by: Stefan Nickl <Stefan.Nickl at kontron.com> -- Stefan Nickl Kontron Modular Computers -------------- next part -------------- A non-text attachment was scrubbed... Name: cpm2_8555.patch Type: text/x-patch Size: 451 bytes Desc: not available Url : http://ozlabs.org/pipermail/linuxppc-embedded/attachments/20050330/2c87af63/attachment.bin
