[U-Boot] LXT972 issue on MPC8247: tx error

[U-Boot] LXT972 issue on MPC8247: tx error

[Sauce.Cheng]

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

i am not sure that at which the mistake happened, because the flow of
initializing is:

eth_initialize() => phy_reset()

in eth_initialize(), insert the struct into the list of devices.

phy_reset(), emulates MII transmit something to PHY, is it right? here i am
not sure about it.

after i input PING command, it will run by sequence fec_init(), fec_send()

in fec_init(), configure some register about FCC, and setup ethernet buffer
discriptors and allocate space for buffer used by Tx and Rx, then initialize
Parameter RAM. that' all, something wrong ?

where the mistakes could happen ? i really cant find it.
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[U-Boot] LXT972 issue on MPC8247: tx error

[Jerry Van Baren]

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

[U-Boot] LXT972 issue on MPC8247: tx error

[Sauce.Cheng]

thanks Jerry Van Baren-7
sorry about my postpone replying
the problem have solved some days ago, thanks for your suggestion about
clocks configurate, though it's 
not clocks' bussiness.

the register cmx_uar is mistake, i have fixed it up by manual. everything is
done
later i will take the details of this problem:s

best regards

thanks!
Sauce
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