LayerscapeのトピックRe: LS1043 Hardware design requirements for Secure Boot

LS1043 Hardware design requirements for Secure Boot

vinodstanly — Thu, 29 Jul 2021 10:32:32 GMT

What are the hardware design considerations required for Secure Boot in LS1043 Platform?

LS1043 Datasheet mentions the following 2 Items

Item-1

"TA_PROG_SFP must be supplied 1.8 V and the chip must operate in the specified fuse programming temperature range only during secure boot fuse programming. For all other operating conditions, TA_PROG_SFP must be tied to GND"

Item-2

For secure boot fuse programming, use the following steps:
1. After the negation of PORESET_B signal, drive TA_PROG_SFP = 1.8 V after a
required minimum delay as listed in Table 7.
2. After the fuse programming is complete, it is required to return TA_PROG_SFP =
GND before the system is power cycled (PORESET_B assertion) or powered down.

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LS1043ARDB (Reference board) has a J13 Jumper option connected to 1.8V. Operated Manually.

Is this the only requirement in hardware for Secure boot implementation ? Any other requirements in Hardware design to implement Secure BOOT for LS1043?

Re: LS1043 Hardware design requirements for Secure Boot

Bulat — Thu, 29 Jul 2021 16:28:20 GMT

Yes, switching of TA_PROG_SFP signal is the only hw design requirement for secure boot fuse programming.

Regards,

Bulat

Re: LS1043 Hardware design requirements for Secure Boot

vinodstanly — Fri, 30 Jul 2021 03:59:32 GMT

Hi Bulat,

Thanks for your quick response.

Switching of TA_PROG_SFP signal is now done Manually, Is there any reference that this feature is automated by a program or additional components.
The above programming for Secure boot feature is limited to 6 times in the life time of a processor, right. What happens after that, will the device become read only?
Apart from programming, for LS1043 to work with the Secure Boot feature; any other Hardware Connections, additional Components to be considered in the design.

Re: LS1043 Hardware design requirements for Secure Boot

Bulat — Mon, 02 Aug 2021 15:09:48 GMT

1. Yes, on our boards it is done in a manual way. You can design your own circuit which will switch the power on/off.
2. Limit of 6 times relates to fuse programming. After that you will not be able to change/re-program fuses.
3. No, besides mentioned in 1) above.