为啥我每次编译都只有kernel没有sysupgrade的？而且app只减不增的情况下，固件都28M？稍微选一些就奔40M去了，根本刷不进去啊！

[theosoft-git]

第一个问题，日志如下：
dd if=/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/jdcloud_re-cp-02-kernel.bin >> /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin
5499+1 records in
5499+1 records out
2815536 bytes (2.8 MB, 2.7 MiB) copied, 0.026398 s, 107 MB/s
dd if=/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/root.squashfs >> /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin
52514+1 records in
52514+1 records out
26887510 bytes (27 MB, 26 MiB) copied, 0.252513 s, 106 MB/s
/media/johnson/SourceCode/Git/lede/staging_dir/host/bin/padjffs2 /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin 4 8 16 64 128 256
padding image to 01c54000
padding image to 01c60000
padding image to 01c80000
bash: line 1: 8: Bad file descriptor
echo '{ "metadata_version": "1.1", "compat_version": "1.1", "compat_message": "Config cannot be migrated from swconfig to DSA", "new_supported_devices": ["jdcloud,re-cp-02"], "supported_devices": ["jdcloud,re-cp-02 - Image version mismatch: image 1.1, device 1.0. Please wipe config during upgrade (force required) or reinstall. Reason: Config cannot be migrated from swconfig to DSA"], "version": { "dist": "OpenWrt", "version": "24.10.0-rc1", "revision": "r7091-41e0c30d8", "target": "ramips/mt7621", "board": "jdcloud_re-cp-02" } }' | fwtool -I - /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin
Failed to open firmware file
make[5]: [Makefile:218: /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin] Error 1 (ignored)
sha256sum "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin" | cut -d" " -f1 > "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.sha256sum"
sha256sum: /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin: No such file or directory
[ ! -s "/media/johnson/SourceCode/Git/lede/key-build" -o ! -s "/media/johnson/SourceCode/Git/lede/key-build.ucert" -o ! -s "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin" ] || { cp "/media/johnson/SourceCode/Git/lede/key-build.ucert" "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.ucert" ; usign -S -m "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin" -s "/media/johnson/SourceCode/Git/lede/key-build" -x "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.sig" ; ucert -A -c "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.ucert" -x "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.sig" ; fwtool -S "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.ucert" "/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin" ; }
cp /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin /media/johnson/SourceCode/Git/lede/bin/targets/ramips/mt7621/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin
cp: cannot stat '/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin': No such file or directory
make[5]: [Makefile:216: /media/johnson/SourceCode/Git/lede/bin/targets/ramips/mt7621/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin] Error 1 (ignored)
DEVICE_ID="jdcloud_re-cp-02" SOURCE_DATE_EPOCH=1733823036 FILE_NAME="openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin" FILE_DIR="/media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp" FILE_TYPE=sysupgrade FILE_FILESYSTEM="squashfs" DEVICE_IMG_PREFIX="openwrt-ramips-mt7621-jdcloud_re-cp-02" DEVICE_VENDOR="JD-Cloud" DEVICE_MODEL="RE-CP-02" DEVICE_VARIANT="" DEVICE_ALT0_VENDOR="" DEVICE_ALT0_MODEL="" DEVICE_ALT0_VARIANT="" DEVICE_ALT1_VENDOR="" DEVICE_ALT1_MODEL="" DEVICE_ALT1_VARIANT="" DEVICE_ALT2_VENDOR="" DEVICE_ALT2_MODEL="" DEVICE_ALT2_VARIANT="" DEVICE_ALT3_VENDOR="" DEVICE_ALT3_MODEL="" DEVICE_ALT3_VARIANT="" DEVICE_ALT4_VENDOR="" DEVICE_ALT4_MODEL="" DEVICE_ALT4_VARIANT="" DEVICE_TITLE="JD-Cloud RE-CP-02" DEVICE_PACKAGES="kmod-mt7915-firmware kmod-sdhci-mt7620" TARGET="ramips" SUBTARGET="mt7621" VERSION_NUMBER="24.10.0-rc1" VERSION_CODE="r28158-d276b4c91a" SUPPORTED_DEVICES="jdcloud,re-cp-02" /media/johnson/SourceCode/Git/lede/scripts/json_add_image_info.py /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/json_info_files/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin.json
Skip JSON creation for non existing file /media/johnson/SourceCode/Git/lede/build_dir/target-mipsel_24kc_musl/linux-ramips_mt7621/tmp/openwrt-ramips-mt7621-jdcloud_re-cp-02-squashfs-sysupgrade.bin

可以看到，dd都是成功的，在一次fwtool操作口，文件直接消失了。然后我手动进staging_dir/hostpkg/bin目录，把fwtool改成./fwtool后，发现操作都是成功的，包括后面的usign和ucert。所以，最终我还是手动生成了sysupgrade，但是不知道能不能用。

第二个问题：
就是文件大小了啦，能删的基本都删了，编译出来还是三十几M，这……到底错哪了？