RE: [ECOS] CS8900 Ethernet Device Driver in EDB7xxx

[Gary Thomas <gthomas at cambridge dot redhat dot com>]

On 19-Jun-2001 honda@itri.org.tw wrote:
> Hello,
>      In the subroutine edb7xxx_cs8900_init of file if_edb7xxx.c, the code
> under the comment // Fetch hardware address is shown below:
> 
>           #if defined(CYGPKG_REDBOOT) && \
>               defined(CYGSEM_REDBOOT_FLASH_CONFIG) && \
>               !defined(CYGSEM_ARM_EDB7XXX_SET_ESA)
>               flash_get_config("edb7xxx_esa", enaddr, CONFIG_ESA);
>           #else
>               for (i = 0;  i < ETHER_ADDR_LEN;  i += 2) {
>                   unsigned short esa_reg = get_reg(PP_IA+i);
>                   enaddr[i] = esa_reg & 0xFF;
>                   enaddr[i+1] = esa_reg >> 8;
>               }
>           #endif
> 
>      If I define CYGSEM_ARM_EDB7XXX_SET_ESA only and not CYGPKG_REDBOOT and
> CYGSEM_REDBOOT_FLASH_CONFIG,, the address enaddr will be filled by get_reg
> (...), so it won't be the value I set in the ConfigTool, is that right?

You can change this if you'd like, but the assumption was that the ESA will
get set by the boot environment (RedBoot) and that the eCos environment will
simply inherit what was previously set.  One probably does not want the ESA
to change from one environment to the next, especially if you want network
debugging to work.