genIVT.pl content

[antonio_santagi]

Hello,

on imx8M Mini I can read at 

https://source.codeaurora.org/external/imx/uboot-imx/tree/doc/imx/habv4/guides/mx8m_mx8mm_secure_boo... 

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=... 

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 

[antonio_santagi]

yes, but how to calculate this address :

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

? 

thank you

[IvanRuiz · Accepted solution]

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.

[IvanRuiz]

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.