linux-kernel - Re: optee-based efi runtime variable service on TI j784s4 platforms

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Message-ID: <CALE0LRt7cwwwQ0Rh+0qJsUzTsNULEQSYgAoviQp5F5SXeJk8LQ@mail.gmail.com>
Date: Tue, 12 Nov 2024 15:39:03 +0100
From: Enric Balletbo i Serra <eballetb@...hat.com>
To: Ilias Apalodimas <ilias.apalodimas@...aro.org>
Cc: Ard Biesheuvel <ardb@...nel.org>, Sumit Garg <sumit.garg@...aro.org>, linux-efi@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, 
	op-tee@...ts.trustedfirmware.org, Manorit Chawdhry <m-chawdhry@...com>, 
	Udit Kumar <u-kumar1@...com>, "Menon, Nishanth" <nm@...com>, 
	Masahisa Kojima <kojima.masahisa@...ionext.com>
Subject: Re: optee-based efi runtime variable service on TI j784s4 platforms

On Tue, Nov 12, 2024 at 2:23 PM Ilias Apalodimas
<ilias.apalodimas@...aro.org> wrote:
>
> [...]
>
> > > > > >
> > > > >
> > > > > Unfortunately that didn't help, but I don't see this code being run.
> > >
> > > That's weird, look below.
> > >
> > > > > Who sets for the first place the uefi variables, is this u-boot
> > > > > writing them to the rpmb? or is optee itself?
> > >
> > > U-Boot sets the variables, but it does so via StandAloneMM.
> > >
> > > > >
> > > >
> > > > I tried to compare the behaviour between optee_rpmb (works) and
> > > > efidebug (doesn't worrk). I see that the first thing optee_rpmb
> > > > command does is open a session against the TA application, something
> > > > that efidebug doesn't do, shouldn't efidebug do the same to access to
> > > > the rpmb device and read or write the efi variables?
> > > >
> > >
> > > That's a bit more complicated and explained to one of the blog posts I
> > > pasted above.
> > > We do open an OP-TEE session, but not for talking to a TA. We send the
> > > messages to StandAloneMM, which then usese OPTEE RPMB APIs to write
> > > the flash.
> > >
> > > The weird thing is why OP-TEE does not format your RPMB when compiling
> > > with that flag.
> > > If done correctly, OP-TEE will wipe the RPMB contents the first time
> > > it tries to access it.
> > >
> >
> > It does if I call optee_rpmb command
> >
> > E/TC:? 0 rpmb_fs_setup:2143 **** Clearing Storage ****
> >
> > But I don't see any attempt to write efi variables to the rpmb
> > partition if I use the normal boot workflow or calling any efi command
> > from the prompt.
> >
> > I think I need to read a bit more about all the pieces because I might
> > miss something.
>
> You don't need the command above to store variables. You need this in
> case you need to use the RPMB from the command line.
> Do a 'printenv -e && setenv -e -bs -rt -nv test test1 && printenv -e'.
> Does that work ?
>

No, `printenv -e` gets stuck. This is the log with some debug messages I added.

=> printenv -e
> lib/efi_loader/efi_setup.c:227 Initialize once only
  > lib/efi_loader/efi_setup.c:234 Set up console modes
  > lib/efi_loader/efi_setup.c:242 Proble block devices to find the ESP
MMC: no card present
mmc_init: -123, time 2002
  > lib/efi_loader/efi_setup.c:249 Initialize variable services
     > lib/efi_loader/efi_var_mem.c:223 efi_allocate_pages
     > lib/efi_loader/efi_var_mem.c:236 efi_create_event
  < lib/efi_loader/efi_var_mem.c:244 - ret=0
D/TC:? 0 load_stmm:297 stmm load address 0x40004000
D/TC:? 0 spm_handle_scall:859 Received FFA version
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
D/TC:? 0 spm_handle_scall:867 Received FFA direct request
... stuck here ... traces indicates never outs from the efi_setup, so
looks like hungs

Let me try with BeaglePlay and read a bit more, as I feel I'm a bit
lost right now.

> >
> > => optee_rpmb read test 4
> > D/TC:? 0 tee_ta_init_pseudo_ta_session:303 Lookup pseudo TA
> > 023f8f1a-292a-432b-8fc4-de8471358067
> > D/TC:? 0 ldelf_load_ldelf:110 ldelf load address 0x40007000
> > D/LD:  ldelf:142 Loading TS 023f8f1a-292a-432b-8fc4-de8471358067
> > F/TC:? 0 trace_syscall:147 syscall #3 (syscall_get_property)
> > F/TC:? 0 trace_syscall:147 syscall #5 (syscall_open_ta_session)
> > D/TC:? 0 ldelf_syscall_open_bin:135 > ldelf_syscall_open_bin
> > D/TC:? 0 ldelf_syscall_open_bin:164 Lookup user TA ELF
> > 023f8f1a-292a-432b-8fc4-de8471358067 (early TA)
> > D/TC:? 0 ldelf_syscall_open_bin:168 res=0
> > F/TC:? 0 trace_syscall:147 syscall #7 (syscall_invoke_ta_command)
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 trace_syscall:147 syscall #11 (syscall_mask_cancellation)
> > F/TC:? 0 trace_syscall:147 syscall #7 (syscall_invoke_ta_command)
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 492 bytes
> > F/TC:? 0 trace_syscall:147 syscall #3 (syscall_get_property)
> > F/TC:? 0 trace_syscall:147 syscall #8 (syscall_check_access_rights)
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 1024 bytes
> > F/TC:? 0 read_compressed:178 532 bytes
> > F/TC:? 0 read_compressed:178 924 bytes
> > F/TC:? 0 trace_syscall:147 syscall #8 (syscall_check_access_rights)
> > F/TC:? 0 read_compressed:178 248 bytes
> > F/TC:? 0 read_compressed:178 760 bytes
> > F/TC:? 0 trace_syscall:147 syscall #6 (syscall_close_ta_session)
> > F/TC:? 0 trace_syscall:147 syscall #3 (syscall_get_property)
> > D/LD:  ldelf:176 ELF (023f8f1a-292a-432b-8fc4-de8471358067) at 0x40048000
> > F/TC:? 0 trace_syscall:147 syscall #33 (syscall_cryp_random_number_generate)
> > F/TC:? 0 trace_syscall:147 syscall #8 (syscall_check_access_rights)
> > F/TC:? 0 trace_syscall:147 syscall #8 (syscall_check_access_rights)
> > F/TC:? 0 trace_syscall:147 syscall #4 (syscall_get_property_name_to_index)
> > F/TC:? 0 trace_syscall:147 syscall #8 (syscall_check_access_rights)
> > F/TC:? 0 trace_syscall:147 syscall #41 (syscall_storage_obj_open)
> > D/TC:? 0 rpmb_fs_open_internal:2356 >>> rpmb_fs_open_internal
> > D/TC:? 0 tee_rpmb_init:1205 >>> core/tee/tee_rpmb_fs.c:1205
> > D/TC:? 0 tee_rpmb_init:1214 >>> core/tee/tee_rpmb_fs.c:1214
> > D/TC:? 0 tee_rpmb_init:1253 >>> core/tee/tee_rpmb_fs.c:1253
> > D/TC:? 0 legacy_rpmb_init:1142 Trying legacy RPMB init
> > D/TC:? 0 rpmb_set_dev_info:1111 RPMB: Syncing device information
> > D/TC:? 0 rpmb_set_dev_info:1113 RPMB: RPMB size is 32*128 KB
> > D/TC:? 0 rpmb_set_dev_info:1114 RPMB: Reliable Write Sector Count is 1
> > D/TC:? 0 rpmb_set_dev_info:1116 RPMB: CID
> > D/TC:? 0 rpmb_set_dev_info:1117 000000009e93ab30  13 01 4e 47 31 4d 31
> > 35  4c 10 27 91 28 07 a9 00
> > D/TC:? 0 legacy_rpmb_init:1162 RPMB INIT: Deriving key
> > D/TC:? 0 tee_rpmb_key_gen:308 RPMB: Using test key
> > D/TC:? 0 legacy_rpmb_init:1176 RPMB INIT: Verifying Key
> > F/TC:? 0 plat_prng_add_jitter_entropy:68 0x61
> > D/TC:? 0 legacy_rpmb_init:1180 Found working RPMB device
> > D/TC:? 0 tee_rpmb_init:1205 >>> core/tee/tee_rpmb_fs.c:1205
> > D/TC:? 0 tee_rpmb_init:1214 >>> core/tee/tee_rpmb_fs.c:1214
> > D/TC:? 0 tee_rpmb_read:1362 Read 1 block at index 0
> > D/TC:? 0 tee_rpmb_write_blk:1494 Write 1 block at index 0
> > D/TC:? 0 tee_rpmb_init:1205 >>> core/tee/tee_rpmb_fs.c:1205
> > D/TC:? 0 tee_rpmb_init:1214 >>> core/tee/tee_rpmb_fs.c:1214
> > D/TC:? 0 tee_rpmb_init:1205 >>> core/tee/tee_rpmb_fs.c:1205
> > D/TC:? 0 tee_rpmb_init:1214 >>> core/tee/tee_rpmb_fs.c:1214
> > D/TC:? 0 tee_rpmb_read:1362 Read 1 block at index 0
> > E/TC:? 0 rpmb_fs_setup:2143 **** Clearing Storage ****
> > D/TC:? 0 tee_rpmb_write_blk:1494 Write 1 block at index 2
> > F/TC:? 0 plat_prng_add_jitter_entropy:68 0xD3
> > D/TC:? 0 tee_rpmb_read:1362 Read 1 block at index 0
> > D/TC:? 0 tee_rpmb_write_blk:1494 Write 1 block at index 0
> > D/TC:? 0 tee_rpmb_read:1362 Read 8 blocks at index 2
> > F/TC:? 0 dump_fat:1951 flags 0x2, size 0, address 0, filename ''
> > D/TC:? 0 read_fat:2221 fat_address 0
> > D/TC:? 0 tee_rpmb_read:1362 Read 8 blocks at index 2
> > F/TC:? 0 plat_prng_add_jitter_entropy:68 0x18
> > E/TA:  read_persist_value:338 Can't open named object value, res = 0xffff0008
> > D/TC:? 0 tee_ta_invoke_command:798 Error: ffff0008 of 4
> > D/TC:? 0 tee_ta_close_session:460 csess 0x9e925a50 id 1
> > D/TC:? 0 tee_ta_close_session:479 Destroy session
> > D/TC:? 0 destroy_context:318 Destroy TA ctx (0x9e9259f0)
> > Failed to read persistent value
> >
> >
> >
> >
> >
> >
> >
> > > Cheers
> > > /Ilias
> > >
> > > > => optee_rpmb read test 4
> > > > D/TC:? 0 tee_ta_init_pseudo_ta_session:303 Lookup pseudo TA
> > > > 023f8f1a-292a-432b-8fc4-de8471358067
> > > > D/TC:? 0 ldelf_load_ldelf:110 ldelf load address 0x40007000
> > > > D/LD:  ldelf:142 Loading TS 023f8f1a-292a-432b-8fc4-de8471358067
> > > > F/TC:? 0 trace_syscall:147 syscall #3 (syscall_get_property)
> > > > F/TC:? 0 trace_syscall:147 syscall #5 (syscall_open_ta_session)
> > > > D/TC:? 0 ldelf_syscall_open_bin:163 Lookup user TA ELF
> > > > 023f8f1a-292a-432b-8fc4-de8471358067 (early TA)
> > > > D/TC:? 0 ldelf_syscall_open_bin:167 res=0
> > > > F/TC:? 0 trace_syscall:147 syscall #7 (syscall_invoke_ta_command)
> > > > F/TC:? 0 read_compressed:178 1024 bytes
> > > > F/TC:? 0 read_compressed:178 1024 bytes
> > > > F/TC:? 0 read_compressed:178 1024 bytes
> > > > F/TC:? 0 read_compressed:178 1024 bytes
> > > > F/TC:? 0 trace_syscall:147 syscall #11 (syscall_mask_cancellation)
> > > > F/TC:? 0 trace_syscall:147 syscall #7 (syscall_invoke_ta_command)
> > > >
> > > > => efidebug query -bs -rt -nv
> > > > MMC: no card present
> > > > mmc_init: -123, time 2002
> > > > D/TC:? 0 load_stmm:297 stmm load address 0x40004000
> > > > D/TC:? 0 spm_handle_scall:859 Received FFA version
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > >
> > > >
> > > >
> > > > >
> > > > > > Thanks
> > > > > > /Ilias
> > > > > > >
> > > > > > > => efidebug query -bs -rt -nv
> > > > > > > D/TC:? 0 load_stmm:297 stmm load address 0x40004000
> > > > > > > D/TC:? 0 spm_handle_scall:859 Received FFA version
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > D/TC:? 0 spm_handle_scall:867 Received FFA direct request
> > > > > > > ... stuck here ... I need to reset the board
> > > > > > >
> > > > > > > Will continue to see if I can get more useful messages
> > > > > > >
> > > > > > > Thanks,
> > > > > > >   Enric
> > > > > > >
> > > > > > > > Thanks
> > > > > > > > /Ilias
> > > > > > > > >
> > > > > > > > > I'll try to add some more prints to verify if REE is used as a store
> > > > > > > > > system, I assume this should say something about RPMB. Am I right with
> > > > > > > > > this?
> > > > > > > >
> > > > > > > >
> > > > > > > > >
> > > > > > > > > > > > >
> > > > > > > > > > > > > And tracing the function calls gives me that:
> > > > > > > > > > > > >
> > > > > > > > > > > > >       tee_stmm_efi_probe() {
> > > > > > > > > > > > >              tee_client_open_context() {
> > > > > > > > > > > > >                optee_get_version() {
> > > > > > > > > > > > >                  tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                } (ret=0xd)
> > > > > > > > > > > > >                tee_ctx_match(); (ret=0x1)
> > > > > > > > > > > > >                optee_smc_open() {
> > > > > > > > > > > > >                  tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                  optee_open() {
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                  } (ret=0x0)
> > > > > > > > > > > > >                } (ret=0x0)
> > > > > > > > > > > > >              } (ret=0xffff000004e71c80)
> > > > > > > > > > > > >              tee_client_open_session() {
> > > > > > > > > > > > >                optee_open_session() {
> > > > > > > > > > > > >                  tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                  optee_get_msg_arg() {
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    tee_shm_get_va(); (ret=0xffff000002909000)
> > > > > > > > > > > > >                  } (ret=0xffff000002909000)
> > > > > > > > > > > > >                  tee_session_calc_client_uuid(); (ret=0x0)
> > > > > > > > > > > > >                  optee_to_msg_param(); (ret=0x0)
> > > > > > > > > > > > >                  optee_smc_do_call_with_arg() {
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    tee_shm_get_va(); (ret=0xffff000002909000)
> > > > > > > > > > > > >                    tee_shm_get_va(); (ret=0xffff000002909060)
> > > > > > > > > > > > >                    optee_cq_wait_init(); (ret=0xffff000002e55910)
> > > > > > > > > > > > >                    optee_smccc_smc(); (ret=0xffff0004)
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    optee_smccc_smc(); (ret=0xffff0004)
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    optee_smccc_smc(); (ret=0xffff0004)
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    optee_smccc_smc(); (ret=0xffff0004)
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    optee_smccc_smc(); (ret=0xffff0004)
> > > > > > > > > > > > >      ... continues sending this forever ...
> > > > > > > > > > > > >      ... Hit ^C to stop recording ...
> > > > > > > > > > > > >                    tee_get_drvdata(); (ret=0xffff000002e55800)
> > > > > > > > > > > > >                    optee_smccc_smc() {
> > > > > > > > > > > > >
> > > > > > > > > > > > > [1] https://docs.u-boot.org/en/latest/develop/uefi/uefi.html#using-op-tee-for-efi-variables
> > > > > > > > > > > > >
> > > > > > > > > > > > > Thanks in advance,
> > > > > > > > > > > >
> > > > > > > > > > > > The most common problem with this is miscompiling the tee_supplicant
> > > > > > > > > > > > application.
> > > > > > > > > > > > Since we don't know if the system has an RPMB, we emulate it in the
> > > > > > > > > > > > tee_supplicant. How did you get the supplicant and can you check if it
> > > > > > > > > > > > was compiled with RPMB_EMU=0 or 1?
> > > > > > > > > > > >
> > > > > > > > > > >
> > > > > > > > > > > I'm using the tee-supplicant provided by the fedora package which is
> > > > > > > > > > > built with ` -DRPMB_EMU=0`, I think that's correct, right?
> > > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Yes, this is correct. We fixed the Fedora package to compile the
> > > > > > > > > > supplicant correctly a while back.
> > > > > > > > > >
> > > > > > > > > > [0] https://www.linaro.org/blog/uefi-secureboot-in-u-boot/
> > > > > > > > > > [1] https://apalos.github.io/Protected%20UEFI%20variables%20with%20U-Boot.html#Protected%20UEFI%20variables%20with%20U-Boot
> > > > > > > > > >
> > > > > > > > > >
> > > > > > > > > > Regards
> > > > > > > > > > /Ilias
> > > > > > > > > > > Thanks,
> > > > > > > > > > >    Enric
> > > > > > > > > > >
> > > > > > > > > > > > Thanks
> > > > > > > > > > > > /Ilias
> > > > > > > > > > > >
> > > > > > > > > > > > >    Enric
> > > > > > > > > > > > >
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> > > > > > > > > > >
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> > > > > > > > >
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> > >
> >
>