如何加载Ext4文件系统

2024.05.10

此文感谢 建军，UEFI Shell下，可以不用复制编译好的独立 .efi到Fat32 U盘加载了，直接从Ext4 Linux文件系统加载。

如下面重新排序后的BLK0-BLK7, BLK1和BLK4的文件系统被识别加载（FAT32），BLK2为Linux Ext4分区，没有被识别和加载。

UEFI v2.70 (EDK II, 0x00010000)
Mapping table
     BLK0: Alias(s):              PcieRoot(0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/NVMe(0x1,32-03-00-00-00-00-00-00)
     FS0: Alias(s):HD0b:;BLK1:    PcieRoot(0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/NVMe(0x1,32-03-00-00-00-00-00-00)/HD(1,GPT,9DD431F3-1E15-584E-987D-827DD40C2E49,0xF000,0x200000)
     BLK2: Alias(s):              PcieRoot(0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/NVMe(0x1,32-03-00-00-00-00-00-00)/HD(2,GPT,8DEE4DA3-BB01-D348-8C62-188B9C031AC1,0x20F000,0x389AB019)
     BLK3: Alias(s):              VenHw(100C2CFA-B586-4198-9B4C-1683D195B1DA)
     FS1: Alias(s):HD1b:;BLK4:    VenHw(100C2CFA-B586-4198-9B4C-1683D195B1DA)/HD(1,GPT,809A75D3-E97F-4F9F-9E15-C4EB053E8AB3,0x800,0x32000)
     BLK5: Alias(s):              VenHw(100C2CFA-B586-4198-9B4C-1683D195B1DA)/HD(2,GPT,836136C3-A854-4F12-8FCD-3F5BCE5C9F24,0x32800,0x8000)
     BLK6: Alias(s):              VenHw(100C2CFA-B586-4198-9B4C-1683D195B1DA)/HD(3,GPT,8B6032D1-3641-44F6-B489-C48D195AC17E,0x3A800,0xE543000)
     BLK7: Alias(s):              VenHw(100C2CFA-B586-4198-9B4C-1683D195B1DA)/HD(4,GPT,96CA6224-A52D-4641-A947-AA3CCBA8DC8C,0xE57D800,0xFA000)

尝试打开blk2失败：

可以将Ext4Dxe.efi 复制到Fat32格式的U盘，在UEFI Shell下从U盘加载；
此时，在UEFI Shell下可从U盘将Ext4Dxe.efi复制到BLK1下，以后就不用U盘了。（没有U盘，可以在Linux下挂载引导分区，然后将Ext4Dxe.efi复制进去）

这样就可以访问BLK2了：

此时，BLK2可以访问，但map命令显示没有别名：

可退出Shell再重新进入，就有了：

想要调试观察学习Ext4Dxe，可以在NDB中手动加载其符号：

BLK1:> load Ext4Dxe.efi
FSOpen: Open ‘.’ Success
FSOpen: Open ‘\Ext4Dxe.efi’ Success
FSOpen: Open ‘\Ext4Dxe.efi’ Success
[Security] 3rd party image[0] can be loaded after EndOfDxe: PcieRoot(0x0)/Pci(0x0,0x0)/Pci(0x0,0x0)/NVMe(0x1,32-03-00-00-00-00-00-00)/HD(1,GPT,9DD431F3-1E15-584E-987D-827DD40C2E49,0xF000,0x200000)/\Ext4Dxe.efi.
add-symbol-file /home/geduer/UEFI/edk2-yourland2024/workspace/Build/YourLand/DEBUG_GCC/AARCH64/Features/Ext4Pkg/Ext4Dxe/Ext4Dxe/DEBUG/Ext4Dxe.dll 0xE9E68000

Loading driver at 0x000E9E67000 EntryPoint=0x000E9E6EA28 Ext4Dxe.efi

05/09/2024 04:48 53,248 Ext4Dxe.efi
交叉校验，并加载，再校验：

.formats 0n53248
eval expression:
  Hex:     00000000`0000d000
  Decimal: 53248
  Octal:   0000000000000000150000
  Binary:  00000000 00000000 00000000 00000000 00000000 00000000 11010000 00000000
  Chars:   ........
  Time:    Mon Jan  1 08:00:00.005 1601 (GMT+8)
  Float:   low 7.46163e-41 high 0
  Double:  2.6308e-319
db 0`E9E67000
00000000`e9e67000  4d 5a 00 00 00 00 00 00-00 00 00 00 00 00 00 00  MZ..............
00000000`e9e67010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e67020  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e67030  00 00 00 00 00 00 00 00-00 00 00 00 58 0e 00 00  ............X...
00000000`e9e67040  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e67050  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e67060  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e67070  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
db 0`E9E67000+d000
00000000`e9e74000  4d 5a 00 00 00 00 00 00-00 00 00 00 00 00 00 00  MZ..............
00000000`e9e74010  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e74020  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e74030  00 00 00 00 00 00 00 00-00 00 00 00 58 0e 00 00  ............X...
00000000`e9e74040  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e74050  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e74060  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
00000000`e9e74070  00 00 00 00 00 00 00 00-00 00 00 00 00 00 00 00  ................
.reload Ext4Dxe.dll=00000000`E9E67000,0`d000; x Ext4Dxe!_ModuleEntryPoint
00000000`e9e6ea28  Ext4Dxe!_ModuleEntryPoint (void, void)

lm
start             end                 name
00000000`00201000 00000000`0020b000   ArmPlatformPrePiUniCore   T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\ArmPlatformPrePiUniCore.dll
00000000`3ec27000 00000000`3ec71000   DxeCore    T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\DxeCore.dll
00000000`e9c62000 00000000`e9d70000   Shell      T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\Shell.dll
00000000`e9e67000 00000000`e9e74000   Ext4Dxe    T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\Ext4Dxe.dll
00000000`e9e74000 00000000`e9e9e600   UiApp      T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\UiApp.dll
00000000`ea6ff000 00000000`ea707000   SdhciHostDxe   T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\SdhciHostDxe.dll
00000000`ea707000 00000000`ea713000   MmcDxe     T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\MmcDxe.dll
00000000`ea713000 00000000`ea721000   NvmExpressDxe   T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\NvmExpressDxe.dll
00000000`ea721000 00000000`ea737000   PciBusDxe   T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\PciBusDxe.dll
00000000`ea737000 00000000`ea740000   Ax88772c   T (pdb/dwarf symbols)        D:\Gedu\edk2-yourland2024\workspace\efisym\Ax88772c.dll

这些已编译的Modules是没有写入UEFI FV的，包括Ext4Dxe

作者：朱博渊  创建时间：2024-05-10 19:50
最后编辑：朱博渊  更新时间：2024-12-20 17:01