BCT
Boot Configuration Table
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Boot Configuration Table
Last updated
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The boot configuration table contains information about which bootloader to boot. On the Surface RT it is stored on the SPI flash. Go to , to dump it directly from SPI. Or do it with nvflash (recommended): sudo ./utils/nvflash_v1.13.87205 --getbct --bct surfacert.bin --configfile ./utils/flash.cfg
To decompile your BCT into a configuration file, use the tool bct_dump.
Usage: bct_dump <your-bct-file>
Tip you can add > <output-file>
to reroute the output to a file.
You can compile your bct.cfg file by using the tool cbootimage.
Usage: cbootimage -s tegra30 -t 30 -gbct <input-bct-configuration-file> <output-bct-file>
Example: cbootimage -s tegra30 -t 30 -gbct surfacert-custom.bct.cfg surfacert-custom.bct
To generate a image file with your BCT and provided bootloader, again use cbootimage.
Usage: cbootimage -d -s tegra30 -t 30 <input-config-file> <output-image-file>
Example: cbootimage -d -s tegra30 -t 30 surfacert.config surfacert.output
<input-config-file> is a file controlling how the .img file should be created. It has the following structure:
Example:
Doing this will create a image file of your BCT and the bootloader you provided. The BCT will automatically updated with the correct sizes and hashes.