AM62A7-Q1: modify sec-cfg.yaml

Toby JIN

Prodigy 40 points

Part Number: AM62A7-Q1

Tool/software:

HI, TI

I want to read data from otp extended region via Acore.

My way, according to TISCI User Guide

1. modify sec-cfg.yaml in u-boot/board/ti/am62x/sec-cfg.yaml

otp_config:

subhdr:

magic: 0x4081

size: 69

write_host_id : 0

otp_entry:

- #1

host_id: 128

host_perms: 2

- #2

host_id: 128

host_perms: 2

Set to 128 if the MMR must be accesible to all hosts

Set to 10b - non-secure, any other value secure

2. Modiy u-boot source code

#define TISCI_MSG_READ_OTP_MMR 0x9022

struct ti_sci_msg_req_read_otp_mmr {

struct ti_sci_msg_hdr hdr;

u8 mmr_idx;

} __packed;

struct ti_sci_msg_resp_read_otp_mmr {

struct ti_sci_msg_hdr hdr;

u32 mmr_val;

} __packed;

call ti_sci_setup_one_xfer and ti_sci_do_xfer to read MMR register in u-boot.img

But, It fails

log info:

ti_sci system-controller@44043000: Message not acknowledgedret -19
ti_sci system-controller@44043000: Message not acknowledgedret -19

Please support us to solve this problem

Thanks

1 month ago

0 Hong Guan64 1 month ago

TI__Guru 63015 points

Please refer to this e2e
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1440681/am6412-read-write-to-extended-otp-from-linux/5536507#5536507
Best,
-Hong

0 Toby JIN 1 month ago in reply to Hong Guan64

Prodigy 40 points

Hi Hong

I have read this article and comment carefully

https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1440681/am6412-read-write-to-extended-otp-from-linux/5536507#5536507

It tells us that we should read otp extended data from optee.

But it seems that it does not success.

So I want to confirm that

Can we read otp extended data via optee ?

0 Toby JIN 1 month ago in reply to Toby JIN

Prodigy 40 points

I also read this article

e2e.ti.com/.../5426867

0 Hong Guan64 1 month ago in reply to Toby JIN

TI__Guru 63015 points

It looks like you had the extended OTP access via OPTEE working.
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1446170/am62a7-q1-keywriter---otp-extended-data
Best,
-Hong

0 Toby JIN 1 month ago in reply to Hong Guan64

Prodigy 40 points

Yes, We can read OTP extended via optee.

But, I still have confusions.

The one way is that I load sbl_stage1, sbl_stage2 and hsm firmware from mcu_plus_sdk_am62ax_09_02_00_38 to AM62Ax, the result is we can read otp extended data via optee successfully !

The another way is that I load tiboot3 ( that had been modify sec_cfg.yaml files), tispl form ti-processor-sdk-linux-edgeai-am62axx-evm-09_02_00_05 to AM62Ax, and not load HSM firmware, the result is failed !

How can We do ?

Thanks

0 Hong Guan64 1 month ago in reply to Toby JIN

TI__Guru 63015 points

Toby JIN said:
The another way is that I load tiboot3 ( that had been modify sec_cfg.yaml files), tispl form ti-processor-sdk-linux-edgeai-am62axx-evm-09_02_00_05 to AM62Ax, and not load HSM firmware, the result is failed !

As noted in the below e2e, have we tested by moving the "write_host_id" entry after 32 entries of "otp_entry" in "sec-cfg.yaml"?
https://e2e.ti.com/support/processors-group/processors/f/processors-forum/1411971/am623-extended-otp-api---yocto---application-user-space/5520979#5520979
"Can we re-test by moving the "write_host_id" entry after 32 entries of "otp_entry" in
https://git.ti.com/cgit/ti-u-boot/ti-u-boot/tree/board/ti/am62x/sec-cfg.yaml?h=10.01.08#n251
Here is the reference on Extended OTP array configuration in secure board config
https://software-dl.ti.com/tisci/esd/latest/3_boardcfg/BOARDCFG_SEC.html#extended-otp-array-configuration"
Best,
-Hong

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AM62A7-Q1: modify sec-cfg.yaml