first commit

.gitignore

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+.*
+!.gitignore
+kernel.headers
+bins/*
+kernel-new.elf

README.md

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+# mtik_initrd_hacks

cpio-fs/etc/rc.d/rc.S

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+#!/bin/sh
+
+/bin/busybox --install /bin
+
+mount -v proc /proc -n -t proc
+
+sh

dump_elf.sh

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+#!/bin/sh
+
+OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq806x
+export STAGING_DIR=$OPENWRT_DIR/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-7.4.0_musl_eabi
+#OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq4xxx
+#export STAGING_DIR=${OPENWRT_DIR}/staging_dir/toolchain-arm_cortex-a7+neon-vfpv4_gcc-7.4.0_musl_eabi
+
+GCC=$STAGING_DIR/bin/arm-openwrt-linux-gcc
+OBJDUMP=$STAGING_DIR/bin/arm-openwrt-linux-objdump
+OBJCOPY=$STAGING_DIR/bin/arm-openwrt-linux-objcopy
+LD=$STAGING_DIR/bin/arm-openwrt-linux-ld
+
+${OBJDUMP} -x kernel.elf > ./kernel.headers
+#${OBJDUMP} -x kernel-new.elf > ./kernel.headers
+
+#${OBJCOPY} -j .text -j initrd -S ./kernel.elf ./kernel.OWL1
+#${OBJCOPY} -R initrd -S ./kernel.elf ./kernel.OWL1
+#${OBJCOPY} -j .rodata -O binary ./kernel.elf ./kernel.OWL1
+
+#initrd is kernel.p2-p3

init/compile_for_arm.sh

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+#!/bin/bash
+
+OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq806x
+export STAGING_DIR=$OPENWRT_DIR/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-7.4.0_musl_eabi
+#OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq4xxx
+#export STAGING_DIR=${OPENWRT_DIR}/staging_dir/toolchain-arm_cortex-a7+neon-vfpv4_gcc-7.4.0_musl_eabi
+
+GCC=$STAGING_DIR/bin/arm-openwrt-linux-gcc
+OD=$STAGING_DIR/bin/arm-openwrt-linux-objdump
+OC=$STAGING_DIR/bin/arm-openwrt-linux-objcopy
+LD=$STAGING_DIR/bin/arm-openwrt-linux-ld
+
+$GCC -static ./init.c -o ../cpio-fs/init
+$OC --strip-all ../cpio-fs/init ../cpio-fs/init

init/init.c

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+#include <stdlib.h>
+#include <stdio.h>
+#include <string.h>
+#include <unistd.h>
+
+extern char** environ;
+
+int main(int argc, char *argv[]){
+  char *new_argv[] = { "/bin/busybox", "sh", "/etc/rc.d/rc.S", NULL };
+
+	environ[0] = "PATH=/sbin:/bin";
+	environ[1] = NULL;
+
+  execvp(new_argv[0], new_argv);
+	return 0;
+}

pack.sh

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+#!/bin/sh
+
+OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq806x
+export STAGING_DIR=$OPENWRT_DIR/staging_dir/toolchain-arm_cortex-a15+neon-vfpv4_gcc-7.4.0_musl_eabi
+#OPENWRT_DIR=/home/prog/openwrt/lede-all/2019-openwrt-all/openwrt-ipq4xxx
+#export STAGING_DIR=${OPENWRT_DIR}/staging_dir/toolchain-arm_cortex-a7+neon-vfpv4_gcc-7.4.0_musl_eabi
+
+GCC=$STAGING_DIR/bin/arm-openwrt-linux-gcc
+OBJDUMP=$STAGING_DIR/bin/arm-openwrt-linux-objdump
+OBJCOPY=$STAGING_DIR/bin/arm-openwrt-linux-objcopy
+LD=$STAGING_DIR/bin/arm-openwrt-linux-ld
+
+cd cpio-fs
+#find . 2>/dev/null | cpio --quiet -o --format='newc' > ../bins/x1.cpio
+find . 2>/dev/null | cpio --quiet -o --format='newc' | \
+	xz --check=crc32 --lzma2=dict=512KiB > ../bins/kernel.p3-new.xz
+#cat ../initramfs.cpio | xz --check=crc32 --lzma2=dict=512KiB > ../bins/kernel.p3-new.xz
+cd ..
+
+cat ./bins/kernel.p2.xz ./bins/kernel.p3-new.xz > ./bins/kernel-new.combo
+${OBJCOPY} --update-section initrd=./bins/kernel-new.combo ./kernel.elf ./kernel-new.elf
+
+cat ./kernel-new.elf > /var/lib/tftpboot/linux_t1.bin
+

unpack.sh

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+#!/bin/sh
+
+exit 0
+
+dd if=kernel.elf bs=1 skip=0 count=43504 of=./bins/kernel.HEAD
+dd if=kernel.elf bs=1 skip=43504 count=1605632 of=./bins/kernel.p2.xz
+dd if=kernel.elf bs=1 skip=1649136 count=84812 of=./bins/kernel.p3.xz
+dd if=kernel.elf bs=1 skip=1733948 of=./bins/kernel.TAIL
+
+#( xz -dc --single-stream > ./bins/initramfs.cpio && cat > ./bins/p3-tail.bin ) < ./bins/kernel.p3.xz
+xz -dc > ./bins/initramfs.cpio < ./bins/kernel.p3.xz
+
+rm -Rf cpio-fs
+mkdir cpio-fs
+cd cpio-fs
+cpio -idv < ../bins/initramfs.cpio