设置 recovery dtb

hc

2024-08-19 eb6b9ee90f50f13c5abb885ce483802d6262f2b5

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What:        /sys/class/chromeos/<ec-device-name>/vbc/vboot_context
Date:        October 2015
KernelVersion:    4.4
Description:
        Read/write the verified boot context data included on a
        small nvram space on some EC implementations.