BCT: Difference between revisions
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BCT (Boot Configuration Table) is a data structure present on Tegra based devices that supplies boot time configuration parameters. | BCT (Boot Configuration Table) is a data structure present on Tegra based devices that supplies boot time configuration parameters. | ||
The Switch's BCT is included in the firmware package titles (0100000000000819 and 010000000000081A) and is installed into eMMC storage's [[ | The Switch's BCT is included in the firmware package titles (0100000000000819 and 010000000000081A) and is installed into eMMC storage's [[Flash_Filesystem#Boot_Partitions|boot partition 0]]. A total of four BCT copies can be installed into the system: normal, normal backup, safe mode and safe mode backup. | ||
During boot, the boot ROM parses the appropriate BCT from eMMC storage and stores a copy of it in IRAM at address 0x40000000. | During boot, the boot ROM parses the appropriate BCT from eMMC storage and stores a copy of it in IRAM at address 0x40000000. | ||
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=== customer_data === | === customer_data === | ||
This data block is ignored by the boot ROM, therefore is available for the programmer to use freely. | This data block is ignored by the boot ROM, therefore is available for the programmer to use freely. | ||
The Switch uses 0xB0 bytes of this area, at offset 0x0450, to store the active [[ | The Switch uses 0xB0 bytes of this area, at offset 0x0450, to store the active [[Flash_Filesystem#Keyblob|keyblob]]. All remaining bytes are zero. | ||
The first bootloader validates and decrypts this block for further key generation. | The first bootloader validates and decrypts this block for further key generation. | ||