On Fri, May 14, 2010 at 1:49 PM, Joe Korty <[email protected]> wrote: > On Fri, May 14, 2010 at 03:19:45PM -0400, Myles Watson wrote: >> On Fri, May 14, 2010 at 1:11 PM, Joe Korty <[email protected]> wrote: >> > Promote heap sizing to first-class Kconfig citizenship. >> > >> > Changing the heap size is something that those, like me, >> > with large PCI device trees need to do. ?Therefore heap >> > size should appear as a normal, user-answerable question >> > within the Kconfig build system. >> >> I think the difference here is that you're a developer (not a user) >> once you start touching the code. Users shouldn't have to worry about >> the heap size. It should be set larger in your mainboard Kconfig if >> the mainboard needs more heap space. > > > Some background: > The reason I'm looking at coreboot is that standard BIOSes > (apparently) run out of memory while doing the bus walk, > when I plug a PCI-e expansion chassis into the motherboard > and populate it. The BIOS will either lock up or the OS > will boot but what the OS sees for a PCI Bus (via lspci > -tv) is clearly corrupt. I wonder if that could be partly due to the ACPI implementation too.
> So my job was/is to do an experiment to see if our problems > are indeed due to out-of-memory issues in standard BIOSes, and > if so, if coreboot could be a useful way around this issue. > > And indeed, the first time I booted coreboot with a > populated PCI-e chassis attached, I got an out-of-memory > halt from coreboot. Increasing CONFIG_HEAP_SIZE to > 0x10000 (ie, 4x) got the system to boot, and lspci -tv > looks good also. I have yet to try intermediate values. It seems like you have a pretty specific special case. Maybe we should create a CONFIG_EXTRA_HEAP that depends on CONFIG_EXPERT that lets you add heap. > Unfortunately we have an even bigger PCI-e loaded expansion > chassis (configuration #2), for which coreboot also hangs. > It's not an out-of-memory hang; it happens (apparently) > during the bus walk. I haven't looked into this hang in > detail yet, so I don't have much to report. But I do fear > it may be something more fundamental. Sounds like fun. Thanks, Myles -- coreboot mailing list: [email protected] http://www.coreboot.org/mailman/listinfo/coreboot
