Messages in this thread |  | | | Date | Wed, 31 Jan 2001 11:27:01 +0100 | | From | Manfred Spraul <> | | Subject | Re: Request: increase in PCI bus limit |
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> > I'm working at a customer site with custom hardware. The 2.4.0 series > kernel almost works out of the box, but the machine has 52 PCI busses. > Plans are to produce a 4-way box which would have over 80 PCI busses. The > file include/asm-i386/mpspec.h allocates space for 32 busses in the > definition of the macro MAX_MP_BUSSES. >
How long is the MP structure? smp_scan_config() reserves only 4 kB:
reserve_bootmem(mpf->mpf_physptr, PAGE_SIZE);
reserving the actual size (mpf->mpf_physptr->mpc_length) could be tricky.
It should be possible to dynamically allocate the memory for the busses: It's not yet possible (smp_read_mpc() is called at a very early stage, before kmalloc is initialized), but we must move it to a later stage anyway: some Compaq bios version need ioremap() in smp_read_mpc(), and we should parse the ACPI tables for APIC descriptors (MADT, ia64 does that already).
I'll add it to my TODO list.
-- Manfred - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org Please read the FAQ at http://www.tux.org/lkml/
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