ahc(4): Default to memory mapped IO #1219
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When this driver was written it made sense to make this default to off, but these days almost all BIOSses will do the right thing. Furthermore non-mmio communication only works on Intel architectures. So lets default to allowing mmio, but not change the semantics of the AHC_ALLOW_MEMIO flag to not break existing installs. Also document the already existing hint.ahc.<unit>.allow_memio. Signed-off-by: HP van Braam <hp@tmm.cx> Reviewed by: imp (small style tweak) Pull Request: freebsd#1219
bsdimp
reviewed
May 10, 2024
sys/dev/aic7xxx/ahc_pci.c
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| @@ -144,20 +144,23 @@ ahc_pci_map_registers(struct ahc_softc *ahc) | |||
| regs_type = 0; | |||
| regs_id = 0; | |||
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| // Default to memio | |||
| allow_memio = 1; | |||
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This is better off as an initializer, imho. Also , we try not to do C++ comments. Tweaked before the push.
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Ah,.I didn't realize that initializers were allowed. I'll keep that in mind for the future, also the comment style, thanks!
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When this driver was written it made sense to make this default to off, but these days almost all BIOSses will do the right thing. Furthermore non-mmio communication only works on Intel architectures.
So lets default to allowing mmio, but not change the semantics of the
AHC_ALLOW_MEMIOflag to not break existing installs. Also document the already existinghint.ahc.<unit>.allow_memio.