SRC Boot Mode Register 2
| SEC_CONFIG | SECONFIG[1] shows the state of the SECONFIG[1] fuse |
| BT_FUSE_SEL | BT_FUSE_SEL (connected to gpio bt_fuse_sel) shows the state of the BT_FUSE_SEL fuse |
| BMOD | BMOD[1:0] shows the latched state of the BOOT_MODE1 and BOOT_MODE0 signals on the rising edge of POR_B |