* Re: Discontiguous memory fun [not found] <35fb2e5905090110171aa77266@mail.gmail.com> @ 2005-10-02 18:57 ` Jon Masters 2005-10-02 23:55 ` Marc Singer 0 siblings, 1 reply; 4+ messages in thread From: Jon Masters @ 2005-10-02 18:57 UTC (permalink / raw) To: Linux Kernel Mailing List Replying to my own post... On 9/1/05, Jon Masters <jonmasters@gmail.com> wrote: > I've got a hardware platform based on an ARM922, a bit like Excalibur, > which has a nice large hole in memory: > > 0x0000_0000 - 32MB (or whatever) of SDRAM. > 0x8000_0000 - 64MB (or whatever) of SDRAM. I fixed it using a bodge similar to PHYS_OFFSET and disabled the lower bank of memory if the kernel was booted at the higher address since it was extremely difficult to play with the half-support for discontig in old 2.4 ARM kernels (all of the existing boards are just playing a game of luck with their memory/node mappings) without a working BDI. I'd love to know what the state of discontig memory is like on 2.6 series ARM kernels and highmem too for that matter, but I've not had chance to look at it (I'm usually a ppc guy). Jon. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Discontiguous memory fun 2005-10-02 18:57 ` Discontiguous memory fun Jon Masters @ 2005-10-02 23:55 ` Marc Singer 2005-10-03 2:10 ` Jon Masters 0 siblings, 1 reply; 4+ messages in thread From: Marc Singer @ 2005-10-02 23:55 UTC (permalink / raw) To: jonathan; +Cc: Linux Kernel Mailing List On Sun, Oct 02, 2005 at 07:57:30PM +0100, Jon Masters wrote: > Replying to my own post... > > On 9/1/05, Jon Masters <jonmasters@gmail.com> wrote: > > I'd love to know what the state of discontig memory is like on 2.6 > series ARM kernels and highmem too for that matter, but I've not had > chance to look at it (I'm usually a ppc guy). It works fine. The node mapping is performed by macros in asm-arm/arch-*/memory.h. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Discontiguous memory fun 2005-10-02 23:55 ` Marc Singer @ 2005-10-03 2:10 ` Jon Masters 2005-10-03 2:30 ` Martin J. Bligh 0 siblings, 1 reply; 4+ messages in thread From: Jon Masters @ 2005-10-03 2:10 UTC (permalink / raw) To: Marc Singer; +Cc: Linux Kernel Mailing List On 10/3/05, Marc Singer <elf@buici.com> wrote: > On Sun, Oct 02, 2005 at 07:57:30PM +0100, Jon Masters wrote: > > Replying to my own post... > > > > On 9/1/05, Jon Masters <jonmasters@gmail.com> wrote: > > > > I'd love to know what the state of discontig memory is like on 2.6 > > series ARM kernels and highmem too for that matter, but I've not had > > chance to look at it (I'm usually a ppc guy). > > It works fine. > > The node mapping is performed by macros in asm-arm/arch-*/memory.h. Hmmm...as it was in 2.4. I'll take a look for my general interest. Jon. ^ permalink raw reply [flat|nested] 4+ messages in thread
* Re: Discontiguous memory fun 2005-10-03 2:10 ` Jon Masters @ 2005-10-03 2:30 ` Martin J. Bligh 0 siblings, 0 replies; 4+ messages in thread From: Martin J. Bligh @ 2005-10-03 2:30 UTC (permalink / raw) To: jonathan, Marc Singer; +Cc: Linux Kernel Mailing List --Jon Masters <jonmasters@gmail.com> wrote (on Monday, October 03, 2005 03:10:28 +0100): > On 10/3/05, Marc Singer <elf@buici.com> wrote: > >> On Sun, Oct 02, 2005 at 07:57:30PM +0100, Jon Masters wrote: >> > Replying to my own post... >> > >> > On 9/1/05, Jon Masters <jonmasters@gmail.com> wrote: >> > >> > I'd love to know what the state of discontig memory is like on 2.6 >> > series ARM kernels and highmem too for that matter, but I've not had >> > chance to look at it (I'm usually a ppc guy). >> >> It works fine. >> >> The node mapping is performed by macros in asm-arm/arch-*/memory.h. > > Hmmm...as it was in 2.4. I'll take a look for my general interest. If you're going to mess with it, please use sparsemem, not discontigmem. The intent is to deprecate and delete the latter. M. ^ permalink raw reply [flat|nested] 4+ messages in thread
end of thread, other threads:[~2005-10-03 2:30 UTC | newest]
Thread overview: 4+ messages (download: mbox.gz / follow: Atom feed)
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2005-10-02 18:57 ` Discontiguous memory fun Jon Masters
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2005-10-03 2:10 ` Jon Masters
2005-10-03 2:30 ` Martin J. Bligh
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