Unpack SD Firmware

• make unpack

Useful Directories

• antminer_sd_fw/update_no_header
• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header

GPIO

• GPIO 907 -> PSU
• GPIO 941 -> RED LED
• GPIO 942 -> GREEN LED

Important Files

SD Firmware

When the SD firmware boots, the Update.sh script is ran, and later the FileParser binary validates and unpacks bin/update.bmu using the bitmain.pub Bitmain public key. The unpacked files are written to NAND.

• antminer_sd_fw/update_no_header/etc/init.d/S37bitmainer_setup
• antminer_sd_fw/update_no_header/etc/init.d/Update.sh
• antminer_sd_fw/update_no_header/etc/bitmain.pub
• antminer_sd_fw/update_no_header/usr/bin/FileParser
• antminer_sd_fw/bin/update.bmu

To understand what update.bmu file looks like internally, we refer to the Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header directory.

• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header/etc/init.d/S70cgminer

The S70cgminer script, loads the following linux drivers:

• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header/lib/modules/fpga_mem_driver.ko
• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header/lib/modules/bitmain_axi.ko

It's not clear yet, what the role of the drivers are.

Once the drivers are loaded, the following binaries are executed:

• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header/usr/bin/cgminer
• Antminer_S19_Pro_zynq7007_BHB42XXX/minerfs_no_header/usr/bin/bmminer

When bmminer is executed, it opens a socket on a specific port, waiting for a connection. Once cgminer is also executed, it connects to bmminer via the open socket.

The role of bmminer is to initialize all hardware, Power Supply, Fans, And the three hashboards (motherboards) that are responsible for hashing.

Once the hardware is initialized, a init signal is sent to cgminer, and it begins connection the the user defined pools, and starts hashing (sending shares)