problem with reading the NV memory index of TPM slb9670

[Simon Glass]

+Ilias Apalodimas


On Tue, 15 Nov 2022 at 23:12, Tasos Terzidis <terzanasta at gmail.com> wrote:
>
> Hello,
>
> I tried to use a tpm2 command for reading the NV memory index of an slb9670
> TPM.
>
> I noticed in file cmd/tpm-v2.c, that the command tpm2 nv_read_value (as tpm
> nv_read_value)
>
> is not implemented. In file lib/tpm-v2.c there is the tpm2_nv_read_value
> function.
>
> Do you plan to implement the command tpm2 nv_read_value in the future ?
>
>
>
> Then I used the
>
> tpm nv_read_value index addr count
>
>       "Read <count> bytes from space <index> to memory address <addr>".
>
>
>
> The syntax I used is
>
> tpm nv_read_value 0x100000000 0x30000000 20
>
> I’m trying to read 32 bytes from 0x100000000 index nv memory of TPM
>
> to 0x30000000 memory of u-boot
>
> U-boot can’t understand the command and returns the help listing all the
> commands for tpm.
>
> I also used
>
> tpm nv_read_value 0x0 0x30000000 20
>
> 0x0 as an offset to 0x100000000 index of NV memory (following the syntax of
> tpm2_nvread command o TSS tpm –tools)
>
>
> Same result, list of commands for tpm
>
>
>
> Other commands of tpm such as tpm2 pcr read or extend functions as expected
> in u-boot environment
>
>
>
> I can’t understand what I do wrong
>
>
>
> Thank you
>
> Tasos Terzids