> There are programs for DOS (TLBMM, umb_driver) that can enable additional
> memory for many chipsets. On some chipsets that memory (or part of it) is
> DMAble, on some not. Some time ago I wrote a patch that made use of that
> enabled memory. But on some chipsets I have seen problems when memory was
> told to be DMAble and I allowed to use it by DMA under linux. Maybe it
> wasn't REALLY dmable?
DMAbility of this memory is usually settable in configuration registers
of the PCI<->ISA bridge... It will require some testing.
On chipsets where it's impossible, we can simply flag these pages as
non-DMAble.
Martin