Hi Frieder, On 11.05.2009 19:44, Frieder Ferlemann wrote: > I don't know whether this proposal really makes sense > but 8051 based Embedded Controlers are very likely to > have 0x02 (the opcode for LJMP) at address 0x0000 and > at some of its IRQ entry points at address 0x0003 + n*8 > > It might be worth warning about because erasing/writing > the flash while the EC is running might not be a good idea. >
Right. How big can n get? I'd simply read address 0x0000 and all IRQ entry points and check if more than m of them are 0x02. > This posting was triggered by todays publication of: > "Flash Programming for Dummies", A book by Carl-Daniel Hailfinger > which specifically mentions interactions with embedded controlers. > :-D > And a grep for "Embedded" "Controler" "EC" within the > flashrom sources did not reveal a warning message. > Yes indeed. If you have more ideas about EC detection heuristics, please tell us. Emitting a warning may be appropriate if we can make reasonably sure that it won't trigger too many false positives. Regards, Carl-Daniel -- http://www.hailfinger.org/ -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
