Hi,
> At the very least we shouldn't overlap with the BDA (starting at
> 0040:0000 and iirc covering up to 256 bytes, which is why DOS
> never used any memory below 0050:0000).
Mmm, I misread the assembly the low limit applied to the multi boot
value was 0x4000 and not 0x1000 ...
Would this logic be acceptable :
high_limit = 0xa0000
low_limit = 0x40000
if (MBI_MEMLIMITS available and >= low_limit)
-> use that - 64k
if (low_limit <= EBDA location < high_limit)
-> use that - 64k
if (BDA memory size >= low_limit)
-> use that - 64k
if all failed:
print_err("No low memory available")
(in pseudo code, didn't really want to code it in assembly if it's not
acceptable :p)
If that looks ok, I can write and test a patch implementing that.
Cheers,
Sylvain Munaut
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