[RFC 3/3] cmd: efidebug: handle booting from removable media
Heinrich Schuchardt
heinrich.schuchardt at canonical.com
Tue Nov 9 10:50:37 CET 2021
On 11/9/21 02:32, AKASHI Takahiro wrote:
> Support for booting from removable media is now added to UEFI boot
> manager. Here we should modify efidebug command in order to define
> a proper "BootXXXX" variable.
>
> With this patch applied, you will be able to specify the boot order,
> usb and scsi:
I guess for a removable device this should work even if the device is
not present. But currently:
=> efidebug boot add -b 1000 USB_present usb 0:1 EFI/BOOT/BOOTARM.EFI
=> efidebug boot add -b 1000 USB_not_present usb 1:1 EFI/BOOT/BOOTARM.EFI
Cannot create device path for "usb 1:1"
A media device path like:
/VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x1)/UsbClass(0x781,0x5571,0x0,0x0,0x0)/HD(1,MBR,0x0c449046,0x800,0x800)
is not very helpful because the next device that you insert may have a
different location of the ESP partition.
I think you should store
/VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/UsbClass(0x0,0x0,0x9,0x0,0x1)/UsbClass(0x781,0x5571,0x0,0x0,0x0)
and find the ESP on it at runtime.
> => efidebug -b 1 SCSI scsi 0:1
> => efidebug boot dump
> Boot0001:
> attributes: A-- (0x00000001)
> label: SCSI
> file_path: /VenHw(e61d73b9-a384-4acc-aeab-82e828f3628b)/Scsi(0,0)/
> HD(1,GPT,0ed48d12-1b4c-4e08-b3ee-decf20428036,0x800,0xa000)
> data:
> 00000000: 00 00
> => efideubg -b 2 USB usb 0:1
efidebug
Best regards
Heinrich
> => efidebug boot order 2 1
> => bootefi bootmgr
>
> Signed-off-by: AKASHI Takahiro <takahiro.akashi at linaro.org>
> ---
> cmd/efidebug.c | 46 ++++++++++++++++++++++++++++++++++++++++------
> 1 file changed, 40 insertions(+), 6 deletions(-)
>
> diff --git a/cmd/efidebug.c b/cmd/efidebug.c
> index a977ca9c72f5..aaf269cdf47d 100644
> --- a/cmd/efidebug.c
> +++ b/cmd/efidebug.c
> @@ -933,6 +933,29 @@ out:
> return initrd_dp;
> }
>
> +/**
> + * count_arguments - count the number of arguments
> + * @argc: Total number of arguments
> + * @argv: Argument array
> + * Return: Number of arguments
> + *
> + * Count the number of arguments for a given option, "-?"
> + * Specifically if the first argument is not "-?", return 0;
> + */
> +static int count_arguments(int argc, char *const argv[])
> +{
> + int i;
> +
> + if (argv[0][0] != '-')
> + return 0;
> +
> + for (i = 1; i < argc; i++)
> + if (argv[i][0] == '-')
> + break;
> +
> + return i;
> +}
> +
> /**
> * do_efi_boot_add() - set UEFI load option
> *
> @@ -945,7 +968,7 @@ out:
> *
> * Implement efidebug "boot add" sub-command. Create or change UEFI load option.
> *
> - * efidebug boot add -b <id> <label> <interface> <devnum>[:<part>] <file>
> + * efidebug boot add -b <id> <label> <interface> <devnum>[:<part>] [<file>]
> * -i <file> <interface2> <devnum2>[:<part>] <initrd>
> * -s '<options>'
> */
> @@ -979,7 +1002,10 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
> argv++; /* 'add' */
> for (; argc > 0; argc--, argv++) {
> if (!strcmp(argv[0], "-b")) {
> - if (argc < 5 || lo.label) {
> + int num_args;
> +
> + num_args = count_arguments(argc, argv);
> + if (num_args < 5 || num_args > 6 || lo.label) {
> r = CMD_RET_USAGE;
> goto out;
> }
> @@ -1000,7 +1026,8 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
> utf8_utf16_strncpy(&label, argv[2], label_len);
>
> /* file path */
> - ret = efi_dp_from_name(argv[3], argv[4], argv[5],
> + ret = efi_dp_from_name(argv[3], argv[4],
> + num_args == 5 ? "" : argv[5],
> &device_path, &file_path);
> if (ret != EFI_SUCCESS) {
> printf("Cannot create device path for \"%s %s\"\n",
> @@ -1008,10 +1035,16 @@ static int do_efi_boot_add(struct cmd_tbl *cmdtp, int flag,
> r = CMD_RET_FAILURE;
> goto out;
> }
> + /* if no file name is given, use device_path */
> + if (num_args == 5) {
> + efi_free_pool(file_path);
> + file_path = device_path;
> + device_path = NULL;
> + }
> fp_size += efi_dp_size(file_path) +
> sizeof(struct efi_device_path);
> - argc -= 5;
> - argv += 5;
> + argc -= num_args;
> + argv += num_args;
> } else if (!strcmp(argv[0], "-i")) {
> if (argc < 3 || initrd_dp) {
> r = CMD_RET_USAGE;
> @@ -1078,7 +1111,8 @@ out:
> free(data);
> efi_free_pool(final_fp);
> efi_free_pool(initrd_dp);
> - efi_free_pool(device_path);
> + if (device_path)
> + efi_free_pool(device_path);
> efi_free_pool(file_path);
> free(lo.label);
>
>
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