Randy Dunlap <rdun...@infradead.org> writes: > On 07/09/2018 07:24 AM, Michael Ellerman wrote: >> Because the allmodconfig logic just sets every symbol to M or Y, it >> has the effect of always generating a 64-bit config, because >> CONFIG_PPC64 becomes Y. >> >> So to make it easier for folks to test 32-bit code, provide a phony >> defconfig target that generates a 32-bit allmodconfig. >> >> The 32-bit port has several mutually exclusive CPU types, we choose >> the Book3S variants as that's what the help text in Kconfig says is >> most common. >> >> Signed-off-by: Michael Ellerman <m...@ellerman.id.au> > > Hi Michael, > > ppc32_allmodconfig sets CONFIG_ISA=y (and other related symbols) and > CONFIG_PPC_CHRP=y. But my builds are failing because they are missing > the functions isa_bus_to_virt() and isa_virt_to_bus(). > > Any ideas?
It's old legacy cruft that we've never implemented :) I don't know if it's possible to implement it for CHRP, Ben implied it might be, back in 2009: https://lists.ozlabs.org/pipermail/linuxppc-dev/2009-June/073232.html But of course nothing came of it. It looks like there's only a handful of drivers left using them, we should probably just mark them as not buildable on PPC. Arnd did something similar for ARM in: e9b106b8fbdb ("net: lance,ni64: don't build for ARM") cheers
