ioremap() >= 128Mb (was: Memory problem with bttv driver)

I followed the 'Memory problem with bttv driver' thread from the archives and was curious if there was any resolution.

The basic problem is that I have a machine with 1G physical memory and a device with an 128Mb of on-board memory that I would like to ioremap(). Of course, since VMALLOC_RESERVE is 128Mb this will always fail if there have been any previous calls to vmalloc() or ioremap() (which is aways true when the driver loads as a module.)

So far I have a few workarounds, but no good long term solution.
- boot the kernel with less than 1G on cmdline: mem=768M
- hack VMALLOC_RESERVE

Is it reasonable to make VMALLOC_RESERVE be configurable at boot-time instead of compile time?

Or, is there a better way to get memory-mapped access to all of the devices on-board memory?

Thanks.

Kevin Hilman <[email protected]>

Or even if there have been no previous calls, since other things (fixmap, kmap, etc) come out of that space too.

M.