[U-Boot-Users] U-boot automatic selection of redundant ethern et interfaces?

[Mark Doherty]

Thanks for your reply Wolfgang, 

> 
> Try what happens when you "#define CONFIG_NET_MULTI"  in  your  board
> config  file.  The  primary  interface  can  be  selected  using  the
> "ethprime" environment variable.

Here is a quick snippet of the config file :-

/*
 * select ethernet configuration
 */
#undef  CONFIG_ETHER_ON_SCC           /* define if ethernet on SCC    */
#define CONFIG_ETHER_ON_FCC           /* define if ethernet on FCC    */
#undef  CONFIG_ETHER_NONE             /* define if ethernet on neither */

#define CONFIG_NET_MULTI

#define CONFIG_ETHER_ON_FCC1
#define CONFIG_ETHER_ON_FCC2

#define CFG_CMXFCR_MASK1
(CMXFCR_FC1|CMXFCR_RF1CS_MSK|CMXFCR_TF1CS_MSK)
#define CFG_CMXFCR_VALUE1       (CMXFCR_RF1CS_CLK10|CMXFCR_TF1CS_CLK9)
#define CFG_CMXFCR_MASK2
(CMXFCR_FC2|CMXFCR_RF2CS_MSK|CMXFCR_TF2CS_MSK)
#define CFG_CMXFCR_VALUE2       (CMXFCR_RF2CS_CLK14|CMXFCR_TF2CS_CLK13)

To be honest this is all I had to change, the addition of the ethprime env
variable certainly helps as well, I'm not sure that I understand the
intention of the code though. I was expecting the interfaces to be available
similtaneously such that I could switch between them, perhaps this is not
the case. I'll illustrate by using an example :-

U-Boot 0.4.0 (Oct 27 2003 - 12:28:40)

MPC8260 Reset Status: Software Watchdog, External Soft, External Hard

MPC8260 Clock Configuration
 - Bus-to-Core Mult 4x, VCO Div 2, 60x Bus Freq  25-75 , Core Freq 100-300
 - dfbrg 1, corecnf 0x1a, busdf 5, cpmdf 1, plldf 0, pllmf 2
 - vco_out  396000000, scc_clk   99000000, brg_clk   24750000
 - cpu_clk  264000000, cpm_clk  198000000, bus_clk   66000000

CPU:   MPC8260 (Rev 14, Mask B.1 4K25A) at 264 MHz
Board: Arca Technologies 82xx, Revision 0.0
I2C:   ready
DRAM:  128 MB
FLASH:  8 MB
In:    serial
Out:   serial
Err:   serial
Net:   FCC1 ETHERNET, FCC2 ETHERNET [PRIME]
BEDBUG:ready
Hit any key to stop autoboot:  0
/******Ping using FCC2*******/
=> ping 192.168.0.121
host 192.168.0.121 is alive

/******Now disconnect FCC2*******/
/******Ping using FCC1*******/
=> ping 192.168.0.121
ping failed; host 192.168.0.121 is not alive
=>

If I switch the ethprime variable to FCC1 then reboot FCC1 works but FCC2
doesn't. Like I mentioned perhaps the problem is my understanding of the
intention of the code rather than any misconfiguration on my part.

> 
> > Any takers?
> 
> Me?
> 
And I'm eternally grateful! :) It makes life a lot more bearable knowing
that someone out there knows the solution to every problem!

Best wishes

Mark.