On Mon, Oct 10, 2011 at 03:32:06PM +0700, Darmawan Salihun wrote: > Hi guys, > > I'm currently debugging a generic PCI Option ROM > (seen as legacy ROM since there is no PnP header). > This is the setup: > > a. The Option ROM "merged" to coreboot binary as CBFS component > (./cbfstool <option-rom-path> genroms/option-rom.rom raw) > > b. SeaBIOS would recognize the Option ROM and execute it. The execution > seems to take place after most PnP option ROM. > > c. Coreboot+Seabios is running inside qemu. > > d. The entire process (qemu with coreboot as "BIOS") is debugged remotely > using IDA Pro. The connection is through GDB remote debugging "plugin" > in IDA Pro. > Therefore, from Qemu persepective, its being debugged remotely by GDB. > > Now, my question: > In this particular option ROM, a call to POST Memory Manager (PMM) is made > to allocate 64KB of memory. What "reaction" SeaBIOS would carry-out to > such request?
Calls to PMM start at romlayout.S:entry_pmm which will transition the cpu to 32bit mode and call pmm.c:handle_pmm(). An allocation call should reserve the memory and return a pointer to it. PMM debug info is on by default, so you should see SeaBIOS write debug info to the serial port. > I've trying to debug this call but nothing seems to happen as I see it > from inside IDA Pro. > > Any clues? or where should I peek in the source code? I suggest getting serial debugging working, and post the full log. -Kevin > > TIA, > > Darmawan _______________________________________________ SeaBIOS mailing list [email protected] http://www.seabios.org/mailman/listinfo/seabios
