openwrt查看cpu架构等基本信息

命令：

cat /etc/os-release

结果：

NAME="ImmortalWrt"
VERSION="21.02-SNAPSHOT"
ID="immortalwrt"
ID_LIKE="lede openwrt"
PRETTY_NAME="ImmortalWrt 21.02-SNAPSHOT"
VERSION_ID="21.02-snapshot"
HOME_URL="https://immortalwrt.org/"
BUG_URL="https://github.com/immortalwrt/immortalwrt/issues"
SUPPORT_URL="https://github.com/immortalwrt/immortalwrt/discussions"
BUILD_ID="r0-3fa9687"
OPENWRT_BOARD="mediatek/mt7981"
OPENWRT_ARCH="aarch64_cortex-a53"
OPENWRT_TAINTS="no-all busybox"
OPENWRT_DEVICE_MANUFACTURER="ImmortalWrt"
OPENWRT_DEVICE_MANUFACTURER_URL="https://immortalwrt.org/"
OPENWRT_DEVICE_PRODUCT="Generic"
OPENWRT_DEVICE_REVISION="v0"
OPENWRT_RELEASE="ImmortalWrt 21.02-SNAPSHOT r0-3fa9687"

其中架构为：

OPENWRT_ARCH="aarch64_cortex-a53"