On Tue, Jun 16, 2009 at 09:26:02PM -0700, H. Peter Anvin wrote: > > I2C or similar busses can be a particularly annoying if they contain > > essential configuration information such as memory size which is needed > > long before anything else. So for far a common solution is that platforms > > are carrying a private (aka redundant, ugly) early-i2c system that's just > > about sufficient for this purpose. > > For what it's worth, this is true for pretty much ALL systems with > removable memory modules, since Serial Presence Detect (SPD) is > electrically equivalent to I2C. > > However, on most systems, even embedded, bringing up memory falls on > firmware (sometimes in the form of a boot loader) so Linux rarely sees it. There are embedded systems were the firmware does not provide a usuable memory map or where that is plain broken. Or Linux with some extra init code serves as the firmware. Often there is a single serial EEPROM for the entire system. If there is an atrocity that can save a penny it will be commited at least in the embedded world. Ralf -- To unsubscribe from this list: send the line "unsubscribe linux-embedded" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
