Intel sez: Synchronous Flash and XIP is the future -- thoughts?
dwmw2 at infradead.org
Mon Dec 16 06:45:49 EST 2002
wd at denx.de said:
> Running the kernel XIP is not so insane. It can help to reduce boot
> time. We still more than 3 seconds from power-on to application
> start, which is not so bad, but still too much in some cases;
> avoiding the memcpy() of some 2 MB of data is kind of attractive
That's true, although even if you have the kernel on a separate flash chip
to which you don't ever write, it does cost you later because you then run
from flash which is slower than RAM. I wonder if we could copy the kernel
from flash to RAM at runtime and fix up the page tables as we go, to get the
best of both worlds?
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