loonarch编译环境搭建

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本文详细指导如何在Ubuntu 16.04环境下安装LoongArch的交叉编译器，包括升级系统库、编译pmon和内核，并展示了编译过程中关键步骤和最终输出。

编译环境搭建

下面以ubuntu16.04 x86环境为例，搭建交叉编译环境如下：
1.龙芯开源社区下载交叉编译器(最右边的二进制下载）

http://www.loongnix.cn/zh/toolchain/GNU/

2.系统相关库升级

apt-get update
apt-get upgrade
apt install bison flex

3.交叉编译loongarch架构的pmon

cd zloader.ls2k
make cfg &&make tgt=rom CROSS_COMPILE=/opt/loongarch64-linux-gnu-2021-08-09-vector/bin/loongarch64-linux-gnu-
make dtb

注意：因为有些二进制和系统文件有执行权限，需要在root执行；
4.交叉编译loongarch架构的内核

make menuconfig ARCH=loongarch
make ARCH=loongarch CROSS_COMPILE=/opt/loongarch64-linux-gnu-2021-08-09-vector/bin/loongarch64-linux-gnu- vmlinuz -j4

编译成功后，会有如下打印信息：

  AR      drivers/built-in.a
  GEN     .version
  CHK     include/generated/compile.h
  AR      built-in.a
  LD      vmlinux.o
  MODPOST vmlinux.o
WARNING: modpost: Found 1 section mismatch(es).
To see full details build your kernel with:
'make CONFIG_DEBUG_SECTION_MISMATCH=y'
  KSYM    .tmp_kallsyms1.o
  KSYM    .tmp_kallsyms2.o
  LD      vmlinux
  SORTEX  vmlinux
  SYSMAP  System.map
  AS      arch/loongarch/boot/compressed/head.o
  CC      arch/loongarch/boot/compressed/decompress.o
  CC      arch/loongarch/boot/compressed/string.o
  CC      arch/loongarch/boot/compressed/dummy.o
  OBJCOPY arch/loongarch/boot/compressed/vmlinux.bin
  HOSTCC  arch/loongarch/boot/compressed/calc_vmlinuz_load_addr
  LZMA    arch/loongarch/boot/compressed/vmlinux.bin.z
  OBJCOPY arch/loongarch/boot/compressed/piggy.o
  LD      vmlinuz
  STRIP	  vmlinuz