i.MX8QXP RevC SD card flash.bin seek offset 32k vs 33k

[petero5]

Hi

https://www.nxp.com/docs/en/user-guide/i.MX_BSP_Porting_Guide_Linux.pdf

"3.1.1 How to build U-Boot in standalone environment" says:
dd if=<boot_image> of=/dev/sd<x> bs=1k seek=<offset> conv=fsync
"Where: offset is: 33 - for i.MX 8"
i.e. 33k

https://community.nxp.com/t5/i-MX-Processors-Knowledge-Base/i-MX8-Boot-process-and-creating-a-bootab...

Flash image
sudo dd if=iMX8QX/flash.bin of=/dev/mmcblkX bs=1k seek=32
"Remember from the information above that the i.MX8 will search for the image at 32k on the SD card, that is why we are flashing it there."

Why does one document say 33k and the other 32k please?
Is 33 a typo?
Or when is 32 valid and when is 33 valid?

Thank you
-- Peter

[petero5]

Thank you very much.
Couldn't find it in the Data Sheet (IMX8QXPAEC).
But did find bootloader_mmc_offset()
https://github.com/nxp-imx/uboot-imx/blob/bb6108298df3bf43bf89428b78725ef72de876d8/drivers/fastboot/...

[joanxie]

sorry， it's my typo, I mean user guide, I attach here, you can refer to chapter 4.3.4
Copying a bootloader image

[joanxie · Accepted solution]

refer to the data sheet,

1 - for i.MX 6 or i.MX 7
•
33 - for i.MX 8QuadMax A0, i.MX 8QuadXPlus A0, and i.MX 8M Quad, and i.MX 8M Mini
•
32 - for i.MX 8QuadXPlus B0, i.MX 8QuadMax B0, i.MX 8DualX, i.MX 8DXL, i.MX 8M Nano, i.MX 8M Plus, and i.MX 8ULP