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packaging: cross-compile for the FP6's own cores

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The phone is one SoC, 4x Cortex-A520 + 4x Cortex-A720, and the package is
built for nothing else, so build for it: -march=armv8.6-a+fp16fml+aes+sha3+sm4
-mtune=cortex-a720 instead of the generic Armv8 baseline. That is gcc's own
-march=native expansion on the phone, re-based on armv8.6-a so clang can
express the same set; 8.6 is the highest level whose mandatory set the phone
exposes (8.7 would assume WFxT, 9.x SVE2 - neither is in its hwcaps, and
SVE2 code would SIGILL). Same string as the fp6-img aports and kernel.
This commit is contained in:
Jorijn van der Graaf 2026-09-05 23:06:57 +02:00
commit 452634683c
2 changed files with 6 additions and 2 deletions
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2
README.md
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@ -110,7 +110,7 @@ make install # DESTDIR/PREFIX staged install incl. the packaging/ files
packaging/make-sysroot.sh # one-time: Alpine aarch64 sysroot from the CDN packaging/make-sysroot.sh # one-time: Alpine aarch64 sysroot from the CDN
crafter-build -- --target=aarch64-alpine-linux-musl \ crafter-build -- --target=aarch64-alpine-linux-musl \
--sysroot=$HOME/.cache/imsd/sysroot-aarch64-alpine \ --sysroot=$HOME/.cache/imsd/sysroot-aarch64-alpine \
--march=armv8-a --mtune=generic --march=armv8.6-a+fp16fml+aes+sha3+sm4 --mtune=cortex-a720
# same flags after `crafter-build test --target=aarch64-alpine-linux-musl` # same flags after `crafter-build test --target=aarch64-alpine-linux-musl`
# run the suite under qemu-aarch64 against the sysroot # run the suite under qemu-aarch64 against the sysroot
``` ```

6
packaging/build-package.sh
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@ -75,7 +75,11 @@ retry "make sysroot" "$SRC/packaging/make-sysroot.sh" "$SYSROOT"
# host arch — the aarch64 binaries are additionally exercised by fp6-img's # host arch — the aarch64 binaries are additionally exercised by fp6-img's
# chroot `make check` whenever an image builds) # chroot `make check` whenever an image builds)
cd "$SRC" cd "$SRC"
XTARGET="--target=aarch64-alpine-linux-musl --sysroot=$SYSROOT --march=armv8-a --mtune=generic" # The phone is one SoC, 4x Cortex-A520 + 4x Cortex-A720, so build for it.
# armv8.6-a is the highest level whose mandatory set it exposes (8.7 would
# assume WFxT, 9.x SVE2 - neither is in its hwcaps); +fp16fml+aes+sha3+sm4 are
# the optional extensions it has. Same string as the fp6-img aports.
XTARGET="--target=aarch64-alpine-linux-musl --sysroot=$SYSROOT --march=armv8.6-a+fp16fml+aes+sha3+sm4 --mtune=cortex-a720"
crafter-build -- $XTARGET crafter-build -- $XTARGET
crafter-build -- --product=media $XTARGET crafter-build -- --product=media $XTARGET
crafter-build -- --product=dialerd $XTARGET crafter-build -- --product=dialerd $XTARGET