Messages in this thread | | | Date | Fri, 18 Mar 2005 04:13:00 +0800 | From | Coywolf Qi Hunt <> | Subject | Re: Kernel memory limits? |
| |
linux-os wrote: > On Thu, 17 Mar 2005, Peter W. Morreale wrote: > >> (I did not see this addressed in the FAQs...) >> >> How much physical memory can the 2.4.26 kernel address in kernel >> context on x86? >> > > All of it. > >> What about DMA memory? >> > > All of it, too. The old DMA controller(s) could only address 16 MB > because that's all the page-registers allowed. Bus-mastering DMA > off the PCI/Bus has no such limitation. Most have DMA controllers > that use scatter-lists so RAM doesn't even have to be contiguous, > only properly allocated (in pages) and nailed down with no caching. >
Kernel Image itself resides at physical address 1M. Is this kernel image area a hole to the old DMA range? Thanks.
Coywolf
- 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/
| |