Hi Marek,
On 2024-05-07 3:28 pm, Marek Vasut wrote:
On 5/7/24 3:06 PM, Claudius Heine wrote:
For CST to find the certificates and keys for signing, some keys and
certs need to be copied into the u-boot build directory.
Make sure to CC "NXP i.MX U-Boot Team" , else NXP is not informed. Use
scripts/get_maintainer to get the full list or just reuse the CC list
from patches in this thread.
I send the patch with `--to-cmd scripts/get_maintainer.pl`, maybe I
should have used `--cc-cmd`, but that would not change the list of
recipients.
diff --git a/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
b/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
index ce1de659d8..42214df21a 100644
--- a/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
+++ b/doc/imx/habv4/guides/mx8m_spl_secure_boot.txt
@@ -144,6 +144,22 @@ The signing is activated by wrapping SPL and
fitImage sections into nxp-imx8mcst
etype, which is done automatically in
arch/arm/dts/imx8m{m,n,p,q}-u-boot.dtsi
in case CONFIG_IMX_HAB Kconfig symbol is enabled.
+Per default the HAB keys and certificates need to be located in the
build
+directory, this means copying the following files from the HAB keys
directory
+flat (e.g. removing the `keys` and `cert` subdirectory) into the
u-boot build
+directory for the CST Code Signing Tool to locate them:
Do symlink(s) work too ?
I have not tested it, but I don't see any reason why it would not. I
also don't see a reason for mentioning it. I want to keep it simple, if
the dev whats to do things differently, they are free to do so.
+- `crts/SRK_1_2_3_4_table.bin`
+- `crts/CSF1_1_sha256_4096_65537_v3_usr_crt.pem`
+- `keys/CSF1_1_sha256_4096_65537_v3_usr_key.pem`
+- `crts/IMG1_1_sha256_4096_65537_v3_usr_crt.pem`
+- `keys/IMG1_1_sha256_4096_65537_v3_usr_key.pem`
+- `keys/key_pass.txt`
+
+The paths to the SRK table and the certificates can be modified via
changes to
+the nxp_imx8mcst device tree node
"nodes", plural, there are two, one for SPL and one for fitImage.
Well, I was thinking here more generally about the node type and was
assuming that the person reading this knows how many they have of that
type. But I can add a `s` in v2.
It would be good to mention the DT properties which govern the crypto
material paths -- nxp,srk-table, nxp,csf-crt, nxp,img-crt -- somewhere
around this sentence.
This is something that should be documented with the changes where that
code was added, IMO. I only documented here what I found out and have
used myself, I haven't used those.
I would be interested in reading how to best overwrite those paths and
the image structured from board u-boot.dtsi files myself.
If you want to can pickup my patch and integrate it into your series and
extend it.
regards,
Claudius
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