Re: [U-Boot] what's the uboot way to pass eth*addr to linux ?

20 Feb 2010


      Hi!
Well, I know nothing about coldfire but for osk5912 it is well known where
all partitions reside on the flash. You can find it the u-boot config file
for coldfire.
The code for MontaVista with kernel 2.4:
static int nicGetMacAddress(u8* macaddr)
{
    int ret = 0;
if (check_mem_region(FLASH_PARAM_
ADDR, FLASH_PARAM_SIZE)) {
      printk("enc28j60: flash memory already in use\n");
      return ENXIO;
    }
    else {
      unsigned long base = FLASH_PARAM_ADDR;
      unsigned long size = FLASH_PARAM_SIZE;
      void *vbase;
      unsigned char *sf = NULL;
      int res;
      int i;
      char *endptr;
res = request_mem_region(base, size, "enc28j60-flash");
      if (!res) {
        printk("enc28j60: flash memory mapping failed\n");
        return ENXIO;
      }
      vbase = ioremap(base, size);
      if (!vbase) {
        printk("enc28j60: flash memory ioremap failed\n");
        return ENOMEM;
      }
      sf = (char *)vbase;
endptr = fw_getenv(sf, "ethaddr");
      if (endptr)
      for (i=0; i<6; i++) { // IPv4
        unsigned long tmp;
        char *str = endptr+1;
        tmp = enc28_strtoul(str, &endptr, 16);
        *macaddr++ = tmp;
      }
      else {
        printk("enc28j60: no ethaddr variable in u-boot environment");
        ret = EINVAL;
      }
iounmap(vbase);
      release_resource(res);
    }
return ret;
}
Hope you can easily adapt it to your kernel!
2010/2/20 Philippe De Muyter phdm@macqel.be
...
Hi Maxim,
On Sat, Feb 20, 2010 at 10:30:32AM +0300, Maxim Podbereznyi wrote:
...
Hi Philippe!
May be it is a little bit tricky but you can just read the u-boot
environment from you Linux driver and use the "ethaddr" variable. I did
the
...
same for osk5912
Sorry, I replied too fast, It seems that I misunderstood your answer.
How do you access the U-boot environment from the linux driver ?
Is there a linux kernel library function to retrieve one element of a
U-boot environment ?  Does U-boot tell linux where the U-boot environment
resides in memory ?
Philippe