Messages in this thread | | | Date | Tue, 31 Oct 2006 07:40:19 -0800 | From | Jun Sun <> | Subject | Re: reserve memory in low physical address - possible? |
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On Tue, Oct 31, 2006 at 07:32:37AM -0500, Richard B. Johnson wrote: > > You will not be able to reserve any address space starting at 0 anyway, but > your driver or even > user-space code can memory-map it. >
Any reasons or concerns as to why I can't reserve any address space starting from 0?
To make my motivation clearer, here is the application scenario.
My system will load an initial OS (could be a strip down Linux or some simple RTOS) into the low memory starting from address 0. The initial OS will then load Linux into higher memory region, say @100M. Then control jumps to Linux while the initial OS is still lurking in the RAM for future use.
> Some early (ISA) boards couldn't access address-space beyoond 16 megabytes, > hense the "low" memory > for DMA. >
So if I don't have ISA performing DMA, I should be OK in this regard?
Thanks.
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