LPC55S69 How to make a signed unencrypted SB2 image?

cp1 — Wed, 13 May 2020 23:18:18 GMT

I'm interested in using LPC55 secure boot and the signed update mechanism for the LPC55S69, but I do not wish to encrypt the firmware for the updates.

How can I create the SB2 file using only signing and no encryption?

Here is my current command.bd file for elftosb.

options {
   flags = 0x8;
   buildNumber = 0x1;
   productVersion = "1.00.00";
   componentVersion = "1.00.00";
   secureBinaryVersion = "2.1";
}

sources {
mainImage = extern(0);
//"/Users/conor/lpc55-secure-boot/signing/bootloader-signed-2.bin";
}

section (0) {
erase 0x0000..0x40000;
load mainImage > 0x0;
}

Re: LPC55S69 How to make a signed unencrypted SB2 image?

ZhangJennie — Thu, 14 May 2020 06:16:27 GMT

Conor Patrick,

The 1B version of the LPC55S6xx silicon supports version 2.1 of the SB image format.

SB2.1 is encrypted+signed. There is no option for signed only.

Have a nice day,

Jun Zhang

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LPC55S69 How to make a signed unencrypted SB2 image?

Re: LPC55S69 How to make a signed unencrypted SB2 image?