README for DDR Binary Patching

Context

We manually update the patched rk3588_ddr_lp4_2112MHz_lp5_2400MHz_v1.18.bin to ensure security, the ddrbin_tool is only downloadable as a compiled executable.

This ELF executable is linked against the GNU C Library (glibc). As the Siderolabs Bldr environment is based on musl, the executable will not run in the bldr environment. Therefore we use a container image with the patched file.

The Patch

The ddrbin_tool modifies specific variables in the DDR binary blob as outlined in the ddrbin_param.txt file located in the same directory. The current patch updates include:

• Changing the internal UART blade uart ID from 2 to 9.
• Modifying the baud rate from 1,500,000 to 115,200.

Steps to Update the Binary

To update the DDR firmware binary, follow these steps:

1. Download Required Tools and Files:

   • Download the ddrbin_tool and the new DDR firmware from the Rockchip Linux GitHub repository: https://github.com/rockchip-linux/rkbin

2. Run the Patching Tool:

   • Execute the ddrbin_tool with the parameters file and the binary:

     ddrbin_tool rk3588 ddrbin_param.txt rk3588_ddr_lp4_2112MHz_lp5_2400MHz_<version>.bin
     

Ensure to replace <version> with the specific version number of the DDR firmware you are working with.