On 08/22/2010 08:02 PM, Kevin O'Connor wrote:
Even with all its warts I think .code16gcc is the best route.
For 16-bit runtime services, I agree. For POST and 32-bit runtime services, I think we can easily push the code to 4G-2M.
The 32bit runtime is also tricky, but thankfully it's under 2K of code and so it can be left in the f-segment.
I'm not sure what you mean by "4G-2M" - are you suggesting running XIP in the "flash" chip?
This is possible in qemu/kvm, but it's not something you'd want to do on real hardware. Accesses to the flash chip are terribly slow - on real hardware you want to copy the code from flash to ram as soon as possible. (You typically want to compress everything in flash also.)
Typically I forget non-qemu constraints, sorry.
I see that ld has some support for overlays, perhaps we can use that?