topic genIVT.pl content in i.MX Processors

genIVT.pl content

antonio_santagi — Wed, 17 Feb 2021 14:33:31 GMT

Hello,

on imx8M Mini I can read at

https://source.codeaurora.org/external/imx/uboot-imx/tree/doc/imx/habv4/guides/mx8m_mx8mm_secure_boot.txt?h=imx_v2019.04_4.19.35_1.1.0

that I need to change the genIVT.pl content from the sample file that I can find :

https://source.codeaurora.org/external/imx/uboot-imx/tree/doc/imx/habv4/script_examples/genIVT.pl?h=imx_v2019.04_4.19.35_1.1.0

This works , but what is the

print $out pack("V", 0x412000D1); # Signature

what is that address and what should I put there if I have more than one file to check from U-boot with the HAB APIs ?

I could find reference for the other addresses so I know how to change them but not for this one.

thank you

Antonio Santagiuliana

Re: genIVT.pl content

IvanRuiz — Wed, 17 Feb 2021 22:34:42 GMT

Hello,

The load address is the image load address, as mentioned in the following thread where a diagram is shown:

https://community.nxp.com/t5/i-MX-Processors/hab-auth-img-problem/m-p/1032545

Hope it helps!

BR,

Ivan.

Re: genIVT.pl content

antonio_santagi — Thu, 18 Feb 2021 08:53:34 GMT

yes, but how to calculate this address :

print $out pack("V", 0x412000D1); # Signature

thank you

Re: genIVT.pl content

IvanRuiz — Thu, 18 Feb 2021 19:48:46 GMT

Hello,

After looking for examples and information about that field, it always remains the same; looking deeper into this in some old script they called it "IVT Header" and shows the same value as the "signature".

open(my $out, '>:raw', 'ivt.bin') or die "Unable to open: $!";
print $out pack("V", 0x412000D1); # IVT Header
print $out pack("V", 0x10801000); # Jump Location

So in conclusion, this field remains the same and the jump location is the load address of the image.

Hope it helps!

BR,

Ivan.