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Messages in this thread |
On 11/28/06, Jon Ringle <jringle@vertical.com> wrote: > Robert Hancock wrote: > > Jon Ringle wrote: > >> Hi, > >> > >> I need to reserve a page of memory at a specific area of RAM that will > >> be used as a "shared memory" with another processor over PCI. How can I > >> ensure that the this area of RAM gets reseved so that the Linux's memory > >> management (kmalloc() and friends) don't use it? > >> > >> Some things that I've considered are iotable_init() and ioremap(). > >> However, I've seen these used for memory mapped IO devices which are > >> outside of the RAM memory. Can I use them for reseving RAM too? > >> > >> I appreciate any advice in this regard. > > > > Sounds to me like dma_alloc_coherent is what you want.. > > > It looks promising, however, I need to reserve a physical address area > that is well known (so that the code running on the other processor > knows where in PCI memory to write to). It appears that > dma_alloc_coherent returns the address that it allocated. Instead I need > something where I can tell it what physical address and range I want to use. > I've seen other projects just boot a 128M board with mem=120M and just use the 8MB at 120 to talk to the other processor.. Dave. - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ | ||||||||||||
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