Re: [E1000-devel] Supporting platforms with no EEPROM?
On Fri, Sep 12, 2008 at 08:54:29PM +0200, Arnaud Patard wrote:
> I don't know which iop32x configurations are enabled in the default
> iop32x kernel but there are some boards with e1000 which do have the
> eeprom so imho unless you do some kind of runtime detection, I fear
> you'll break theses boards.
Well looking at the datasheet of one of the e1000 chips, it looks like
if you check the contents of EEPROM_INIT_CONTROL1_REG in the eeprom
data, then a check of (value & 0xc000 == 0x4000) will tell you that the
eeprom is valid, and otherwise you have no eeprom or an invalid eeprom.
So if you detect that no valid eeprom is present, check if the existing
MAC address is a valid one, and if so, leave the chip alone and assume
it is a board with no eeprom but some other method of configuring it.
--
Len Sorensen
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