openwrt的编译系统是如何生成squashfs文件系统的

答:请看include/image.mk中的以下定义:

define Image/mkfs/squashfs

        $(STAGING_DIR_HOST)/bin/mksquashfs4 $(call mkfs_target_dir,$(1)) $@

                -nopad -noappend -root-owned

                -comp $(SQUASHFSCOMP) $(SQUASHFSOPT)

                -processors 1

        $(if $(SOURCE_DATE_EPOCH),-fixed-time $(SOURCE_DATE_EPOCH))

endef

SQUASHFSOPT := -b $(SQUASHFS_BLOCKSIZE)

SQUASHFS_BLOCKSIZE := $(CONFIG_TARGET_SQUASHFS_BLOCK_SIZE)k

从以上定义可以看出制作squashfs的关键参数由openwrt中的配置项CONFIG_TARGET_SQUASHFS_BLOCK_SIZE来决定,通过修改此配置项的值即可改变squashfs文件系统