[LinuxBIOS] Fun easy question. 512Kb or 256Kb
bari at onelabs.com
Tue Feb 7 15:35:26 CET 2006
Adam Talbot wrote:
> Speed in ns:
> What controls that? Can I set/change the access speed to my "bios chip"?
The timing of the Flash BIOS read and write cycles are hardwired into
the chipset and clock synthesizer. At most there is a pinstrap (Pinstrap
= A signal line on a chipset that is read only after RESET that is used
to configure the chipset. The line is either tied to a High or Low via a
resistor.) to chose the type of firmware interface, x8, x16, LPC or FWH.
For an example, see page #3 of this schematic:
> I have a few boards that had Eon chips(120ns), I have replaced them with
> SST's(45ns), they work fine. Are they running faster?
No. The chipset spec may just require a flash device of 120ns or less.
Dropping in a faster flash device doesn't change the read access speed,
since the speed is driven by the chipset.
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