cat /proc/sys/kernel/printk
3       4       1       3

bear -- make O=build -j10 Image.gz modules dtbs
make O=build modules_install INSTALL_MOD_PATH=.
./install-rpi.sh

minicom -b 115200 -D /dev/cu.usbserial-0001
[    0.000000] ################################

[    0.000k00] #   RPi CUSTOM KERNEL ACTIVE   #

[    0.000000] ################################

[    0.000000]

[    0.000000]

docker pull ghcr.io/cybrid-systems/dev

warning: the following paths have collided (e.g. case-sensitive paths
on a case-insensitive filesystem) and only one from the same
colliding group is in the working tree:

  'include/uapi/linux/netfilter/xt_CONNMARK.h'
  'include/uapi/linux/netfilter/xt_connmark.h'
  'include/uapi/linux/netfilter/xt_DSCP.h'
  'include/uapi/linux/netfilter/xt_dscp.h'
  'include/uapi/linux/netfilter/xt_MARK.h'
  'include/uapi/linux/netfilter/xt_mark.h'
  'include/uapi/linux/netfilter/xt_RATEEST.h'
  'include/uapi/linux/netfilter/xt_rateest.h'
  'include/uapi/linux/netfilter/xt_TCPMSS.h'
  'include/uapi/linux/netfilter/xt_tcpmss.h'
  'include/uapi/linux/netfilter_ipv4/ipt_ECN.h'
  'include/uapi/linux/netfilter_ipv4/ipt_ecn.h'
  'include/uapi/linux/netfilter_ipv4/ipt_TTL.h'
  'include/uapi/linux/netfilter_ipv4/ipt_ttl.h'
  'include/uapi/linux/netfilter_ipv6/ip6t_HL.h'
  'include/uapi/linux/netfilter_ipv6/ip6t_hl.h'
  'net/netfilter/xt_DSCP.c'
  'net/netfilter/xt_dscp.c'
  'net/netfilter/xt_HL.c'
  'net/netfilter/xt_hl.c'
  'net/netfilter/xt_RATEEST.c'
  'net/netfilter/xt_rateest.c'
  'net/netfilter/xt_TCPMSS.c'
  'net/netfilter/xt_tcpmss.c'
  'tools/memory-model/litmus-tests/Z6.0+pooncelock+poonceLock+pombonce.litmus'
  'tools/memory-model/litmus-tests/Z6.0+pooncelock+pooncelock+pombonce.litmus'

git clone --depth=1 https://github.com/raspberrypi/linux.git
cd linux
apt install bc

mkdir build
make O=build bcm2711_defconfig
bear -- make O=build -j10 Image.gz modules dtbs
make O=build modules_install INSTALL_MOD_PATH=.

cat >> build/.config << 'EOF'
# Early Debug Configuration
CONFIG_DEBUG_INFO=y
CONFIG_GDB_SCRIPTS=y
CONFIG_EARLY_PRINTK=y
CONFIG_DEBUG_LL=y
CONFIG_DEBUG_UART_PL011=y
CONFIG_DEBUG_UART_PHYS=0x3f215040
CONFIG_DEBUG_UART_VIRT=0xf215040
CONFIG_DEBUG_UNCOMPRESS=y
CONFIG_DEBUG_LL_INCLUDE="debug/8250.S"
EOF

CompileFlags:
  Remove: [-mabi=lp64]

# 🎯 完整传输（rsync + sudo，权限OK）

KVER=$(ls build/lib/modules/ | head -1)
echo "模块版本: $KVER"

# 1. Image.gz（压缩内核，必须）
rsync -avz build/arch/arm64/boot/Image.gz pi@192.168.1.95:/boot/firmware/ --rsync-path="sudo rsync"

# 2. DTB（设备树，bcm2711/rpi5）
rsync -avz build/arch/arm64/boot/dts/broadcom/*.dtb pi@192.168.1.95:/boot/firmware/ --rsync-path="sudo rsync"

# 3. Overlays（驱动叠加，必须完整目录）
rsync -avz --delete build/arch/arm64/boot/dts/overlays/ pi@192.168.1.95:/boot/firmware/overlays/ --rsync-path="sudo rsync"

# 4. Modules（驱动模块，关键！）
rsync -avz --delete build/lib/modules/$KVER/ pi@192.168.1.95:/lib/modules/$KVER/ --rsync-path="sudo rsync"
ssh pi@192.168.1.95 "sudo depmod -a $KVER && echo 'depmod完成'"

# 5. 更新 + 重启
ssh pi@192.168.1.95 'cd ~/code/kernel-update && ./update-kernel.sh && sudo reboot'

#!/bin/bash
# 保存到: ~/code/kernel-update/backup-kernel.sh

echo "=== 开始备份当前内核和配置 ==="

# 创建备份目录
sudo mkdir -p /boot/firmware/backup
BACKUP_DIR="/boot/firmware/backup/$(date +%Y%m%d_%H%M%S)"
sudo mkdir -p "$BACKUP_DIR"

# 备份内核文件
echo "备份内核文件..."
sudo cp /boot/firmware/kernel8.img "$BACKUP_DIR/"
sudo cp /boot/firmware/Image.gz "$BACKUP_DIR/" 2>/dev/null || true

# 备份配置文件
echo "备份配置文件..."
sudo cp /boot/firmware/config.txt "$BACKUP_DIR/"
sudo cp /boot/firmware/cmdline.txt "$BACKUP_DIR/"

# 备份设备树
echo "备份设备树..."
sudo cp /boot/firmware/*.dtb "$BACKUP_DIR/" 2>/dev/null || true
sudo cp -r /boot/firmware/overlays "$BACKUP_DIR/" 2>/dev/null || true

# 备份网络配置（重要！）
echo "备份网络配置..."
sudo cp -r /etc/netplan "$BACKUP_DIR/" 2>/dev/null || true
sudo cp -r /etc/NetworkManager "$BACKUP_DIR/" 2>/dev/null || true

echo "=== 备份完成 ==="
echo "备份位置: $BACKUP_DIR"
echo "当前备份列表:"
sudo ls -la "$BACKUP_DIR"

#!/bin/bash
# 保存到: ~/code/kernel-update/update-kernel.sh

echo "=== 开始更新内核 ==="

# 检查新内核文件是否存在
if [ ! -f "/boot/firmware/Image.gz" ]; then
    echo "错误: 未找到新内核文件 /boot/firmware/Image.gz"
    echo "请先传输新内核文件"
    exit 1
fi

# 备份当前配置
./backup-kernel.sh

# 配置使用新内核
echo "配置使用新内核..."
sudo cp /boot/firmware/config.txt /boot/firmware/config.txt.backup

# 在config.txt中启用新内核
if grep -q "kernel=Image.gz" /boot/firmware/config.txt; then
    echo "新内核已配置"
else
    # 注释原内核，启用新内核
    sudo sed -i 's/^kernel=/#kernel=/' /boot/firmware/config.txt
    echo "kernel=Image.gz" | sudo tee -a /boot/firmware/config.txt
fi

echo "=== 内核更新配置完成 ==="
echo "重启后生效: sudo reboot"
echo "验证命令: uname -r"

% ssh pi@pi                                                                                             yuanqi@MacBook-Pro-2
Linux pi 6.12.57-v8+ #1 SMP PREEMPT Fri Nov 14 20:56:44 CST 2025 aarch64

The programs included with the Debian GNU/Linux system are free software;
the exact distribution terms for each program are described in the
individual files in /usr/share/doc/*/copyright.

Debian GNU/Linux comes with ABSOLUTELY NO WARRANTY, to the extent
permitted by applicable law.
Last login: Sun Dec  7 14:02:19 2025 from 192.168.1.100
pi@pi:~ $ uname -r
6.12.57-v8+

#!/bin/bash
# 保存到: ~/code/kernel-update/restore-kernel.sh

echo "=== 内核恢复工具 ==="

# 查找最新的备份
LATEST_BACKUP=$(sudo ls -td /boot/firmware/backup/*/ | head -1)

if [ -z "$LATEST_BACKUP" ]; then
    echo "错误: 未找到备份文件"
    exit 1
fi

echo "找到备份: $LATEST_BACKUP"
echo "恢复内容:"
sudo ls -la "$LATEST_BACKUP"

read -p "确认恢复？(y/n): " confirm
if [ "$confirm" != "y" ]; then
    echo "取消恢复"
    exit 0
fi

# 恢复内核文件
echo "恢复内核文件..."
sudo cp "$LATEST_BACKUP/kernel8.img" /boot/firmware/ 2>/dev/null || true
sudo cp "$LATEST_BACKUP/Image.gz" /boot/firmware/ 2>/dev/null || true

# 恢复配置文件
echo "恢复配置文件..."
sudo cp "$LATEST_BACKUP/config.txt" /boot/firmware/
sudo cp "$LATEST_BACKUP/cmdline.txt" /boot/firmware/

# 恢复设备树
echo "恢复设备树..."
sudo cp "$LATEST_BACKUP"/*.dtb /boot/firmware/ 2>/dev/null || true
sudo cp -r "$LATEST_BACKUP/overlays" /boot/firmware/ 2>/dev/null || true

# 恢复网络配置（如果需要）
if [ -d "$LATEST_BACKUP/netplan" ]; then
    echo "恢复网络配置..."
    sudo cp -r "$LATEST_BACKUP/netplan" /etc/
    sudo netplan apply
fi

echo "=== 恢复完成 ==="
echo "请重启: sudo reboot"

cd ~/code
gcc trace_gpio_test.c -o trace_gpio
./trace_gpio

#!/bin/bash
# trace_gpio_mmap.sh

echo "=== GPIO mmap 完整轨迹跟踪 ==="

# 挂载 debugfs
mount -t debugfs nodev /sys/kernel/debug/tracing 2>/dev/null
cd /sys/kernel/debug/tracing

# 1. 重置跟踪器
echo 0 | sudo tee tracing_on > /dev/null
echo | sudo tee trace > /dev/null
echo | sudo tee set_ftrace_filter > /dev/null
echo | sudo tee set_graph_function > /dev/null

# 2. 设置 function_graph 跟踪器
echo function_graph | sudo tee current_tracer > /dev/null

# 3. 设置已验证的函数名（根据 available_filter_functions）
echo "__arm64_sys_mmap" | sudo tee -a set_graph_function > /dev/null
echo "ksys_mmap_pgoff" | sudo tee -a set_graph_function > /dev/null
echo "vm_mmap_pgoff" | sudo tee -a set_graph_function > /dev/null
echo "do_mmap" | sudo tee -a set_graph_function > /dev/null
echo "mmap_region" | sudo tee -a set_graph_function > /dev/null
echo "__mmap_region" | sudo tee -a set_graph_function > /dev/null
echo "rpi_gpiomem_mmap" | sudo tee -a set_graph_function > /dev/null
echo "rpi_gpiomem_open" | sudo tee -a set_graph_function > /dev/null

# 4. 添加 VMA 相关函数
echo "vm_area_alloc" | sudo tee -a set_graph_function > /dev/null
echo "vma_merge_new_range" | sudo tee -a set_graph_function > /dev/null
echo "vma_link_file" | sudo tee -a set_graph_function > /dev/null
echo "vma_set_page_prot" | sudo tee -a set_graph_function > /dev/null

# 5. 添加内存映射核心函数
echo "remap_pfn_range" | sudo tee -a set_graph_function > /dev/null
echo "remap_pfn_range_internal" | sudo tee -a set_graph_function > /dev/null
echo "__pte_offset_map_lock" | sudo tee -a set_graph_function > /dev/null

# 6. 配置跟踪选项
echo 1 | sudo tee options/func_stack_trace > /dev/null
echo 1 | sudo tee options/sleep-time > /dev/null
echo 1 | sudo tee options/graph-time > /dev/null

# 7. 开始跟踪
echo 1 | sudo tee tracing_on > /dev/null

# 8. 运行测试程序
echo "运行测试程序..."
/home/pi/code/trace_gpio &

# 9. 等待并停止跟踪
sleep 3
echo 0 | sudo tee tracing_on > /dev/null

# 10. 保存跟踪结果
sudo cat trace > /tmp/gpio_mmap_complete_trace.log
echo "跟踪结果保存到: /tmp/gpio_mmap_complete_trace.log"

# 11. 显示关键部分
echo "=== GPIO 驱动调用路径 ==="
sudo cat trace | grep -A30 -B5 "rpi_gpiomem" | head -80

#!/bin/bash
# trace_gpio_detailed.sh

cd /sys/kernel/debug/tracing

# 清除之前的设置
echo 0 | sudo tee tracing_on > /dev/null
echo nop | sudo tee current_tracer > /dev/null
echo | sudo tee set_ftrace_filter > /dev/null
echo | sudo tee set_graph_function > /dev/null

# 设置 function_graph
echo function_graph | sudo tee current_tracer > /dev/null

# 系统调用入口
echo "__arm64_sys_mmap" | sudo tee -a set_graph_function > /dev/null
echo "ksys_mmap_pgoff" | sudo tee -a set_graph_function > /dev/null

# 内存管理核心函数
echo "vm_mmap_pgoff" | sudo tee -a set_graph_function > /dev/null
echo "do_mmap" | sudo tee -a set_graph_function > /dev/null
echo "mmap_region" | sudo tee -a set_graph_function > /dev/null
echo "__mmap_region" | sudo tee -a set_graph_function > /dev/null

# VMA 操作函数
echo "vm_area_alloc" | sudo tee -a set_graph_function > /dev/null
echo "vma_merge_new_range" | sudo tee -a set_graph_function > /dev/null
echo "vma_link_file" | sudo tee -a set_graph_function > /dev/null
echo "vma_set_page_prot" | sudo tee -a set_graph_function > /dev/null

# 文件操作相关
echo "fget" | sudo tee -a set_graph_function > /dev/null
echo "fput" | sudo tee -a set_graph_function > /dev/null

# 驱动特定函数
echo "rpi_gpiomem_mmap" | sudo tee -a set_graph_function > /dev/null
echo "rpi_gpiomem_open" | sudo tee -a set_graph_function > /dev/null

# 页表操作函数
echo "remap_pfn_range" | sudo tee -a set_graph_function > /dev/null
echo "remap_pfn_range_internal" | sudo tee -a set_graph_function > /dev/null
echo "__pte_offset_map_lock" | sudo tee -a set_graph_function > /dev/null

# 安全相关函数
echo "security_mmap_file" | sudo tee -a set_graph_function > /dev/null
echo "security_mmap_addr" | sudo tee -a set_graph_function > /dev/null
echo "cap_mmap_file" | sudo tee -a set_graph_function > /dev/null
echo "cap_mmap_addr" | sudo tee -a set_graph_function > /dev/null

# 设置跟踪选项
echo 1 | sudo tee options/func_stack_trace > /dev/null
echo 1 | sudo tee options/graph-time > /dev/null

# 开始跟踪
echo 1 | sudo tee tracing_on > /dev/null
echo "跟踪开始，运行测试程序..."
/home/pi/code/trace_gpio &
sleep 3
echo 0 | sudo tee tracing_on > /dev/null

# 显示结果
sudo cat trace | head -100

# 安装 trace-cmd
sudo apt update
sudo apt install trace-cmd

# 验证安装
trace-cmd --version

#!/bin/bash
# trace_gpio_tracecmd.sh

echo "使用 trace-cmd 跟踪 GPIO mmap..."

# 记录跟踪数据（使用 sudo）
timeout 10 sudo trace-cmd record \
    -e syscalls:sys_enter_mmap \
    -e syscalls:sys_exit_mmap \
    -p function_graph \
    -g __arm64_sys_mmap \
    -g rpi_gpiomem_mmap \
    -g remap_pfn_range \
    -F /home/pi/code/trace_gpio

# 生成报告（旧版本命令）
echo "=== GPIO 相关事件 ==="
sudo trace-cmd report | grep -i gpio

echo -e "\n=== mmap 系统调用 ==="
sudo trace-cmd report | grep -i mmap

echo -e "\n=== 函数图分析 ==="
sudo trace-cmd report | grep -A10 -B5 "rpi_gpiomem_mmap\|__arm64_sys_mmap"

sudo trace-cmd record -e 'syscalls:*mmap*' -p function -F /home/pi/code/trace_gpio
sudo trace-cmd report

# 查找 mmap 系统调用开始
grep -n "__arm64_sys_mmap\|ksys_mmap" /tmp/gpio_mmap_complete_trace.log

# 查看内存管理核心函数
grep -A10 -B5 "do_mmap\|mmap_region\|__mmap_region" /tmp/gpio_mmap_complete_trace.log

# 查找 GPIO 驱动函数
grep -A20 -B10 "rpi_gpiomem_mmap\|rpi_gpiomem_open" /tmp/gpio_mmap_complete_trace.log

# 统计 __pte_offset_map_lock 调用次数和总耗时
grep "__pte_offset_map_lock" /tmp/gpio_mmap_complete_trace.log | wc -l
grep "__pte_offset_map_lock" /tmp/gpio_mmap_complete_trace.log | awk '{sum += $3} END {print "总耗时:", sum, "us"}'

# 查看 VMA 分配耗时
grep -A5 "vm_area_alloc\|kmem_cache_alloc" /tmp/gpio_mmap_complete_trace.log

# 提取关键函数的时间线
awk '/__arm64_sys_mmap/,/rpi_gpiomem_mmap/' /tmp/gpio_mmap_complete_trace.log | head -50

# 检查 remap_pfn_range 是否执行
grep -A10 "remap_pfn_range" /tmp/gpio_mmap_complete_trace.log

tail -100 /tmp/gpio_mmap_complete_trace.log
 3)   0.593 us    |    _raw_spin_lock();
 3)   3.037 us    |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.685 us    |    __rcu_read_lock();
 3)   0.685 us    |    _raw_spin_lock();
 3)   3.019 us    |  }
 3)               |  __arm64_sys_mmap() {
 3)               |    ksys_mmap_pgoff() {
 3)               |      fget() {
 3)   0.574 us    |        __rcu_read_lock();
 3)   0.667 us    |        __rcu_read_unlock();
 3)   3.056 us    |      }
 3)               |      vm_mmap_pgoff() {
 3)               |        security_mmap_file() {
 3)   0.556 us    |          cap_mmap_file();
 3)   1.870 us    |        }
 3)   0.722 us    |        down_write_killable();
 3)               |        do_mmap() {
 3)               |          __get_unmapped_area() {
 3)               |            mm_get_unmapped_area_vmflags() {
 3)               |              generic_get_unmapped_area_topdown() {
 3)   1.352 us    |                vm_unmapped_area();
 3)   2.574 us    |              }
 3)   3.889 us    |            }
 3)               |            security_mmap_addr() {
 3)   0.593 us    |              cap_mmap_addr();
 3)   1.852 us    |            }
 3)   7.463 us    |          }
 3)               |          memfd_file_seals_ptr() {
 3)   0.556 us    |            shmem_mapping();
 3)   1.834 us    |          }
 3)   0.685 us    |          path_noexec();
 3)               |          mmap_region() {
 3)               |            __mmap_region() {
 3)   0.666 us    |              may_expand_vm();
 3)   0.648 us    |              vms_clean_up_area();
 3)               |              vma_merge_new_range() {
 3)   0.592 us    |                can_vma_merge_right();
 3)   1.870 us    |              }
 3)               |              vm_area_alloc() {
 3)   0.667 us    |                kmem_cache_alloc_noprof();
 3)   0.685 us    |                kmem_cache_alloc_noprof();
 3)   0.574 us    |                __init_rwsem();
 3)   4.463 us    |              }
 3)   0.574 us    |              vm_get_page_prot();
 3)   0.629 us    |              kmem_cache_alloc_noprof();
 3)               |              ext4_file_mmap() {
 3)               |                touch_atime() {
 3)               |                  atime_needs_update() {
 3)   0.574 us    |                    make_vfsuid();
 3)   0.555 us    |                    make_vfsgid();
 3)   3.000 us    |                  }
 3)   4.297 us    |                }
 3)   5.408 us    |              }
 3)   0.611 us    |              down_write();
 3)   0.703 us    |              up_write();
 3)               |              call_rcu() {
 3)               |                __call_rcu_common.constprop.0() {
 3)   0.574 us    |                  rcu_segcblist_enqueue();
 3)   1.870 us    |                }
 3)   3.186 us    |              }
 3)               |              vma_link_file() {
 3)   0.611 us    |                down_write();
 3)   0.796 us    |                vma_interval_tree_insert();
 3)   0.593 us    |                up_write();
 3)   4.481 us    |              }
 3)   0.574 us    |              perf_event_mmap();
 3)   0.574 us    |              vms_complete_munmap_vmas();
 3)               |              vma_set_page_prot() {
 3)   0.667 us    |                vm_get_page_prot();
 3)   0.648 us    |                vma_wants_writenotify();
 3)   2.907 us    |              }
 3) + 37.925 us   |            }
 3) + 39.185 us   |          }
 3) + 52.093 us   |        }
 3)   0.574 us    |        up_write();
 3) + 58.315 us   |      }
 3)   0.574 us    |      fput();
 3) + 65.111 us   |    }
 3) + 66.555 us   |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.667 us    |    __rcu_read_lock();
 3)   0.686 us    |    _raw_spin_lock();
 3)   2.982 us    |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.685 us    |    __rcu_read_lock();
 3)   0.666 us    |    _raw_spin_lock();
 3)   2.963 us    |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.574 us    |    __rcu_read_lock();
 3)   0.593 us    |    _raw_spin_lock();
 3)   3.074 us    |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.575 us    |    __rcu_read_lock();
 3)   0.592 us    |    _raw_spin_lock();
 3)   3.093 us    |  }
 3)               |  __pte_offset_map_lock() {
 3)   0.575 us    |    __rcu_read_lock();
 3)   0.574 us    |    _raw_spin_lock();
 3)   2.963 us    |  }

# 在进程虚拟空间查找空闲区域
__get_unmapped_area() {
  mm_get_unmapped_area_vmflags() {
    generic_get_unmapped_area_topdown() {
      vm_unmapped_area();  # 查找合适的虚拟地址范围
    }
  }
}
security_mmap_addr();  # 安全检查

vm_area_alloc() {  # 分配 VMA 结构体
  kmem_cache_alloc_noprof();  # 从 slab 分配器分配内存
}
vm_get_page_prot();  # 设置页面保护权限
vma_set_page_prot() {
  vm_get_page_prot();  # 获取页面保护标志
  vma_wants_writenotify();  # 设置写通知
}

ext4_file_mmap() {  # 文件系统的 mmap 操作
  touch_atime() {   # 更新访问时间
    atime_needs_update() {
      make_vfsuid();  # 权限检查
      make_vfsgid();
    }
  }
}
# 注意：这里调用的是 ext4 的 mmap，如果是 GPIO 驱动应该显示 rpi_gpiomem_mmap

vma_link_file() {  # 将 VMA 链接到进程的 VMA 链表
  down_write();    # 获取写锁
  vma_interval_tree_insert();  # 插入到区间树中
  up_write();      # 释放锁
}

pinout

# 安装编译依赖
sudo apt update
sudo apt install python3-pigpio

# 下载并编译pigpio
cd ~
wget https://github.com/joan2937/pigpio/archive/refs/heads/master.zip
unzip master.zip
cd pigpio-master
make -j
sudo make install

# 启动守护进程
sudo pigpiod

# 安装gpiozero（通常已预装）
sudo apt install python3-gpiozero

pwm_hw_test.py

docker run --privileged -d -it --name angel -v `pwd`:/root/code -w /root/code ghcr.io/cybrid-systems/dev
docker exec -it --detach-keys="ctrl-z,z" angel /bin/zsh
git config --global user.name $your_name
git config --global user.email $your_email

git clone https://github.com/torvalds/linux.git
cd linux

# 1. 生成默认配置
make defconfig

# 2. 启用调试选项
./scripts/config --enable DEBUG_KERNEL
./scripts/config --enable DEBUG_INFO
./scripts/config --enable KGDB
./scripts/config --enable FTRACE
./scripts/config --set-val DEBUG_INFO_DWARF4 y

# 3. 自动处理依赖关系
make olddefconfig

# 4. 可选：检查配置
grep -E "DEBUG_KERNEL|DEBUG_INFO|KGDB|FTRACE" .config

# 5. 编译内核
make CC=clang -j$(nproc)
bear -- make CC=clang LLVM=1 -j$(nproc)
make CC=clang binrpm-pkg LOCALVERSION=-debug -j$(nproc)

dpkg -i kernel-*.deb
update-grub
reboot

cd rootfs
mkdir -p {etc,dev,proc,sys,tmp,var,usr/bin,usr/sbin,lib,root}

cd rootfs/dev

# 创建设备文件
sudo mknod console c 5 1
sudo mknod null c 1 3
sudo mknod zero c 1 5
sudo mknod ttyAMA0 c 204 64
sudo chmod 666 console null zero ttyAMA0

cd rootfs
cat > init << 'EOF'
#!/bin/sh

echo "Starting system..."

# 挂载必要文件系统
mount -t proc proc /proc
mount -t sysfs sysfs /sys
mount -t devtmpfs devtmpfs /dev
mount -t tmpfs tmpfs /tmp

# 设置终端
exec </dev/ttyAMA0 >/dev/ttyAMA0 2>&1

# 设置环境变量
export PATH=/bin:/sbin:/usr/bin:/usr/sbin
export HOME=/root
export USER=root

# 显示系统信息
echo "=== BusyBox Linux ==="
echo "Kernel: $(uname -r)"
echo "System is ready!"

# 启动shell（修复job control）
exec setsid sh -c 'exec sh </dev/ttyAMA0 >/dev/ttyAMA0 2>&1'
EOF
chmod +x init

cat > etc/fstab << 'EOF'
proc    /proc   proc    defaults    0   0
sysfs   /sys    sysfs   defaults    0   0
tmpfs   /tmp    tmpfs   defaults    0   0
EOF

cd rootfs

# 创建CPIO格式的rootfs（用于initrd）
find . | cpio -H newc -o | gzip > ../rootfs.cpio.gz

# 或者创建ext4文件系统镜像
dd if=/dev/zero of=../rootfs.ext4 bs=1M count=64
mkfs.ext4 ../rootfs.ext4
mkdir -p /mnt/rootfs
sudo mount ../rootfs.ext4 /mnt/rootfs
sudo cp -ra . /mnt/rootfs/
sudo umount /mnt/rootfs

brew install autoconf automake cmake libgccjit gnutls texinfo jansson tree-sitter gcc libgccgit
curl -O https://mirrors.ustc.edu.cn/gnu/emacs/emacs-30.1.tar.xz
tar -xvf emacs-30.1.tar.xz
cd emacs-30.1
./autogen.sh

export CC="/opt/homebrew/opt/gcc/bin/gcc-15"
export CXX="/opt/homebrew/opt/gcc/bin/g++-15"
export LIBRARY_PATH="/opt/homebrew/opt/gcc/lib/gcc/15:$LIBRARY_PATH"