topic Re: u-boot signing for imx8qxp secure boot in i.MX Processors

u-boot signing for imx8qxp secure boot

rakesh3 — Tue, 07 Nov 2023 19:20:23 GMT

Hi team,

I am working on secure boot of imx8qxp-mek board and i am following the below doc for that.

https://github.com/nxp-imx/uboot-imx/blob/lf_v2023.04/doc/imx/ahab/guides/mx8_mx8x_spl_secure_boot.txt

Since I am using the flash_spl binary for target so I am using above doc.

I have certain doubts, please help me to understand on this.

1) As per doc first we have to sign the "u-boot-atf-container.img" and then final flash_spl will have 3 containers.

scfw_tcm.bin, u-boot-spl.bin, u-boot-atf-container.img

In above we have signed u-boot-atd-container.img and using it further for creating the flash.bin.

but in the doc its mentioned

"The flash.bin file include three containers and the second container have to be
signed using the Code Signing Tool (CST)."

Here 2nd container i think is u-boot-spl.bin . So, do we need to sign this also or not ?

Please clarify on this

2) I am using csf_uboot_atf.txt for signing the u-boot-atf-container.img, and since i have generated the SRK key with CA flags enabled so ,which csf file should i use to create final signed image flash.bin .csf_boot_image_sgh.txt or csf_boot.txt

Please suggest some input on these doubts.

Regards,

Re: u-boot signing for imx8qxp secure boot

Harvey021 — Thu, 09 Nov 2023 09:49:53 GMT

1), If you check the soc.mak, the out is flash.bin

2), csf_boot_image_sgk.txt

Best regards

Harvey

Re: u-boot signing for imx8qxp secure boot

rakesh3 — Fri, 10 Nov 2023 12:29:39 GMT

Hi @Harvey021 ,

thanks for reply,

for 1 ) I meant that as per the doc mentioned

"The flash.bin file include three containers and the second container have to be
signed using the Code Signing Tool (CST)."

flash_spl: $(MKIMG) $(AHAB_IMG) scfw_tcm.bin u-boot-spl.bin u-boot-atf-container.img

Here 2nd container for flash.bin i think is u-boot-spl.bin . So, do we need to sign this u-boot-spl.bin or not ? if yes then how , its not mentioned in the doc. please suggest .

thanks for clarify the 2nd point.

Regards,

Re: u-boot signing for imx8qxp secure boot

Harvey021 — Mon, 13 Nov 2023 02:39:16 GMT

Yes, you need to include the u-boot-spl.bin which will be wrapped into flash.bin

Best regards

Harvey