This message has two purposes:
1) to check and see if uclinux-dev is up and accepting messages and
2) summarizing the resolution to a problem with the hope that it helps someone
else.
My apologies if the logjam suddenly clears and my previous messages make it
through...my mail client assures me that it has given up on them completely.
I'm in the process of bringing up the latest uClinux-dist-20080808 and 2.6
kernel on my hardware and was having networking problems. The hardware is a
near duplicate to the M5272C3, so I configure uClinux as such. A critical
piece, however, is the absence of Freescale's dBug bootloader on my hardware.
I'm using a custom bootloader.
I modified fec.c (temporarily) so that it gets the MAC address from fec.c
rather than reading a location in the dBug flash.
At that point, the board was coming up, but printing a "No phy device found"
message. Skipping to the solution, it turns out that the M5272C3 config of
uClinux does not set the GPIO pins for the FEC, apparently relying on the
bootloader to do this.
I'm not sure where general opinion lies regarding how 'standalone' the
configured uClinux image should be, and I suppose it could also be argued that
I'm not really running on a M5272C3 if, by definition, the M5272C3 includes
dBug. If the intent is to make the image as independent of the bootloader as
possible, then I've included a proposed change to the 5272 config.c file below.
There are probably better CONFIG switches to use, perhaps a combination of
CONFIG_5272 and whatever gets set when the Coldfire FEC is enabled? I'm afraid
I'm still trying to sort out the config routines.
John (not Adam <G>)
--- uClinux-dist/linux-2.6.x/arch/m68knommu/platform/5272/config.c
2008-06-19 21:22:23.000000000 -0400
+++ uClinux-changes/linux-2.6.x/arch/m68knommu/platform/5272/config.c
2008-08-27 14:21:53.000000000 -0400
@@ -143,6 +143,13 @@ void __init config_BSP(char *commandp, i
/* Copy command line from FLASH to local buffer... */
memcpy(commandp, (char *) 0xf0010000, size);
commandp[size-1] = 0;
+#elif defined(CONFIG_M5272C3)
+ u32 v;
+
+ /* Enable the lines for the FEC */
+ v = readl(MCF_MBAR + MCFSIM_PBCNT);
+ v = (v & ~0xffff0000) | 0x55550000;
+ writel(v, MCF_MBAR + MCFSIM_PBCNT);
#endif
mcf_timervector = 69;
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