Request: increase in PCI bus limit
Quoted 7 lines
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 fileinclude/asm-i386/mpspec.hallocates space for 32 busses in the definition of the macroMAX_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
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