[U-Boot] LXT972 issue on MPC8247: tx error
Jerry Van Baren
gerald.vanbaren at ge.com
Mon Mar 16 13:15:06 CET 2009
Hi Sauce.Cheng,
Sauce.Cheng wrote:
> my code run on the board reveal the info as following:
>
> Board: Motorola MPC8272ADS
> DRAM: 32 MB
> FLASH: 512 kB
> In: serial
> Out: serial
> Err: serial
> Net: FCC1 ETHERNET
> bb_miiphy_write()
> Hit any key to stop autoboot: 0
> =>
>
> after i enter words like "ping 192.168.0.100",show something like this
> PS. the line start as "chengmo" are debug infos
>
> chengmo : fec_init
> chengmo 0 : rtx.txbd[0].cbd_sc : 00004c00
> chengmo 1 : rtx.txbd[1].cbd_sc : 00004c00
> Using FCC1 ETHERNET device
> chengmo : fec_send
> chengmo_b : rtx.txbd[0].cbd_sc : 00004c00
> chengmo_a : rtx.txbd[0].cbd_sc : 0000ec00
> fec: tx error
> chengmo : fec_send
> fec: tx buffer not ready
> ping failed; host 192.168.0.100 is not alive
>
> eventually, show me that "fec: tx buffer not ready."
> this prompt is in fec_send() in ether_fcc.c
[snip]
> where the mistakes could happen ? i really cant find it.
Your FEC (Tx) most likely is not being clocked. Check your QE clock
configurations, verify that your PHY/MAC/??? is generating the correct
clocks, etc.
FWIIW, I had this happen on my board because the H/W designer strapped
the PHY to power up with the clocks disabled (lowers power). I have to
flip a bit in a PHY register to enable clocks. (I'm using a different
processor and different PHY, YMMV.)
HTH,
gvb
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