Re: ioremap returns NULL

[Manfred Spraul]

 >>[...]
 >> For each card I ioremap() 2 * 16 MB of PCI memory space.
 >> It succeeds for the 1st card but for the 2nd card I get NULL
 >> as result. This means I cannot use the 2nd card...
 >
 >I think you are screwed. The ioremap grabs from vmalloc area,
 >which is something like 64MB on i386. The best option is
 >to rewrite the driver to allocate less, and perhaps use
 >fewer modules.

The size of the vmalloc area is 128 MB, 96 for highmem kernels.
Either:
- compile a kernel without 4G support, then you have 128 MB
- increase PKMAP_BASE (include/asm-i386/highmem.h) to
	0xff800000 (it's 0xfe000000 in 2.5.50)
Right now 32 MB virtual memory are reserved for kmap, but only 4 MB are 
used. Changing PKMAP_BASE gives you 24 MB additional vmalloc space for free.
- increase __VMALLOC_RESERVE.

--
	Manfred