-----Original Message----- From: Eric Lammerts [mailto:u-boot@lists.lammerts.org] Sent: Monday, June 15, 2009 3:59 PM To: Johan Cc: u-boot@lists.denx.de; Ilya Yanok Subject: Re: [U-Boot] [PATCH 3/7] fec_imx27: driver for FEC ethernet controller on i.MX27
On 06/15/09 10:01, Johan wrote:
I have trouble using your patch together with our LogicPD iMX27 Litekit. Seems like the FEC driver does not work well. Here is some output from when I try to load files with tftp
<snip> > Loading: #####T #####################T #########################T ############T# > #########################T ######################################## > ##T ####################################T #########T T ######### > Retry count exceeded; starting again
<snip> > I have downloaded the imx27lite head from the u-boot testing branch. I > have also tried to patch the u-boot-2009.06-rc3 branch with your > patches, but it does not seem to be any different. Do you have any > ideas what might be wrong?
Did you have working ethernet before (with a different bootloader or in Linux)? Do you have the breakout board installed? I have the same board (but maybe an older revision; about a year old) and with the breakout board mounted my ethernet would behave the same way as yours. They routed the MII signals all the way to the headers on the breakout board, and that causes signal integrity problems. It could be that they fixed it on later revisions though (not sure).
I'm using u-boot-v2, so I don't know anything about the u-boot fec driver.
Eric
I'm trying to debug ethernet problems on a custom iMX27 board with same LAN chip as the logicPD liteKit. I don't claim to be an expert, but it seems that in the fec driver posted by Ilya, the phy address for MII access is hard coded to a 0, whereas on the board it defaults to 0x1f. When I turned on DEBUG in fec_imx27.c, the MII reads always return all 1's. The phy works, but maybe by good fortune, not intent.
Bill Cook cook@isgchips.com Imaging Solutions Group Inc; http://www.isgcameras.com