Dan Malek <dan at embeddededge.com> wrote:
>
> On Jul 26, 2004, at 1:20 PM, Linh Dang wrote:
>
>> - has it been discussed/comptemplate/done before?
>
> Of course. Use mmap(), either on /dev/mem directly, or more
> preferable through a simple device driver for your ASIC that
> could also do simple system protection.
>
> Please don't be making such memory mapping kernel
> modifications. It will only cause future trouble.
>
> -- Dan
My understanding is:
- mmap(2) uses pages to map the device (my platform doesn't have large page.)
- mapping a large address range (hundreds-of-megabytes) is much more
efficient with BATs than with pages.
So, do you mean:
- mmap(2) can use BATs? or
- the difference in performance is negligible between BATs and
pages when mapping an address range of 200MBs?
Thanx
--
Linh Dang
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