Boot Mode Writer Service¶
Table of Contents
Introduction¶
The boot mode writer service can be used to program boot mode efuses present on devices to support reduced boot pin mode feature. The service accepts the boot mode efuse index and the 32-bit raw fuse value as inputs.
Note
The value of a boot mode efuse cannot be modified after programming.
How to derive to-be programmed value?¶
One needs the following data items: #. Raw boot mode value for the boot mode of interest. This value is fixed for every boot mode on a device. #. The 25-bit bitmask for the efuse which has to be programmed.
The following figure demonstrates the procedure to derive the value to be sent over tisci message.
How to get the values?¶
You need the following data items to derive the boot mode value (to send over tisci) for a boot mode of interest:
- Raw boot mode value. (Refer the Boot Mode Pins Section of the TRM)
- The efuse bitmask. (Refer the boot mode efuse soc document)
