EFI 应用程序错误写保护

Question

我尝试对我列举的文件系统进行一些 write/read 操作。问题是当我想写入其他卷而不是我自己的卷 (fs0) 时，它会 return WRITE PROTECTED 错误。

 ... Enumerated and opened all available volumes successfuly

 efiStatus = root->Open(root, &token, L"xxx", EFI_FILE_MODE_READ | EFI_FILE_MODE_WRITE | EFI_FILE_MODE_CREATE, 0);
    
    if (efiStatus == EFI_SUCCESS)
    {
        char* myStr = "Sample Content";
        UINTN myStrSize = strlenEx(myStr);

        efiStatus = token->Write(token, &myStrSize, myStr);
        if (efiStatus != EFI_SUCCESS)
        {
            Print(L"[X] ! Error [%r]!\n", efiStatus);
        }
        Print(L"Found Some\n", efiStatus);
    }

我也尝试了 ShellCreateDirectory、ShellWriteFile。我真的可以从 EFI 应用程序访问写入硬盘 (pci) 吗？

编辑：

drivers 命令输出：

                T   D
D           Y C I
R           P F A
V  VERSION  E G G #D #C DRIVER NAME                         IMAGE NAME
== ======== = = = == == =================================== ==========
43 00000014 D - -  1  - AMI USB Driver                      Uhcd
45 00000014 B - -  1  4 USB bus                             Uhcd
46 00000002 D - -  3  - USB Hid driver                      Uhcd
47 00000001 D - -  1  - USB Mass Storage driver             Uhcd
85 00010000 ? - -  -  - AMI ExFat Driver                    EXFAT
86 00010000 D - -  5  - AMI NTFS Driver                     NTFS
89 00000001 D - -  2  - <null string>                       MouseDriver
8B 00000001 B - -  1  3 AMI AHCI BUS Driver                 Ahci
8F 00000001 ? - -  -  - AMI NVMe BUS Driver                 Nvme
123 00000010 D - -  1  - Serial ATA Controller Initializatio SataController
12E 00000010 B - -  1  1 AMI Console Splitter Text Out Drive ConSplitter
12F 00000010 B - -  1  1 AMI Console Splitter Text In Driver ConSplitter
130 00000010 B - -  1  1 AMI Console Splitter Pointer Driver ConSplitter
133 00000010 D - -  1  - AMI Graphic Console Driver          GraphicsConsole
134 0000000A D - - 15  - Generic Disk I/O Driver             DiskIoDxe
135 0000000B B - -  3 11 Partition Driver(MBR/GPT/El Torito) PartitionDxe
137 00000000 ? - -  -  - Integrated Touch Driver             IntegratedTouch
13A 00000010 B - -  1  5 AMI Generic LPC Super I/O Driver    GenericSio
13C 00A50110 B - -  1 15 AMI PCI Bus Driver                  PciBus
13E 00000010 ? - -  -  - AMI PS/2 Driver                     Ps2Main
13F 00000000 ? - -  -  - DNS Network Service Driver          DnsDxe
140 00000000 ? - -  -  - DNS Network Service Driver          DnsDxe
145 0000000A D - -  2  - FAT File System Driver              Fat
147 00010001 ? - -  -  - AMI ISO9660 File System Driver      FsIso9660
149 00000001 ? - -  -  - <null string>                       PcieSataController
14A 00000001 ? - -  -  - <null string>                       PcieSataController
14B 0000001B B - -  1  3 Intel(R) RST 16.0.2.3402 RAID Drive RaidDriver
159 09000432 B - -  1  1 Intel(R) GOP Driver [9.0.1074]      MemoryMapped(0x3,0x845F3018,0x846040D8)

Answer 1

我有根据的猜测是您试图访问 NTFS 卷（因为您谈到了 Windows 分区）并且 NTFS 不支持 UEFI（默认情况下）。至少，我还没有看到任何固件。 UEFI 仅支持 FAT32 文件系统。

如果您在您的平台上进入 UEFI shell，您应该会看到 "映射 table"（请参见下面的示例图片），如果有是一个标记为 “FS0” 的设备。这表明固件检测到磁盘，发现了分区，并且能够挂载文件系统。其余标记为 BLK 的卷，这意味着 UEFI 只能使用 BlockIO 协议提供访问权限。不支持 FS 协议。

EFI 应用程序错误写保护

EFI Application Erorr Write Protected

filesystems

firmware

uefi

edk2