imx6 - fuse

有三個方法：

1. Uboot
2. 系統
3. mfg-tool (emmc為例)

1. uboot

imxotp blow --force <index> <value>"

其中 index  = (Fuse Address - 0x400) / 0x10
ex: (Fusemap Descriptions)  
    Fuse Address  Fuses Name   Number of Fuses  Fuses Function
     0x660[31:0]       GP1[31:0]                  32             General Purpose
  
    index = (0x660 - 0x400) / 0x10 = 26

write :  imxopt blow --force 26 0x84267139
read  :  imxopt read 26

2. 系統

read
$ cat /sys/fsl_otp/HW_OCOTP_GP1

write 
$ echo 0x00006200 > /sys/fsl_otp/HW_OCOTP_GP1

3. mfg-tool (看here)

修改 ucl2.xml
<LIST name="Android-SabreSD-eMMC" desc="Choose eMMC android as media">
  <!-- Android Profile: -->
 <CMD state="BootStrap" type="boot" body="BootStrap" file ="u-boot-mx6q-sabresd.bin" >Loading U-boot</CMD>
 <CMD state="BootStrap" type="load" file="uImage" address="0x10800000"
        loadSection="OTH" setSection="OTH" HasFlashHeader="FALSE" >Loading Kernel.</CMD>
    <CMD state="BootStrap" type="load" file="initramfs.cpio.gz.uboot" address="0x10C00000"
        loadSection="OTH" setSection="OTH" HasFlashHeader="FALSE" >Loading Initramfs.</CMD>
    <CMD state="BootStrap" type="jump" > Jumping to OS image. </CMD>
 <CMD state="Updater" type="push" body="$ dd if=/dev/zero of=/dev/mmcblk0 bs=512 seek=1536 count=16">clean up u-boot parameter</CMD>
 <CMD state="Updater" type="push" body="$ echo 1 > /sys/devices/platform/sdhci-esdhc-imx.3/mmc_host/mmc0/mmc0:0001/boot_config">access boot partition 1</CMD>
 <CMD state="Updater" type="push" body="send" file="files/android/u-boot-6q.bin">Sending U-Boot</CMD>
 <CMD state="Updater" type="push" body="$ dd if=$FILE of=/dev/mmcblk0 bs=512 seek=2 skip=2">write U-Boot to sd card</CMD>

 <CMD state="Updater" type="push" body="$ echo 8 > /sys/devices/platform/sdhci-esdhc-imx.3/mmc_host/mmc0/mmc0:0001/boot_config">access user partition and enable boot partion 1 to boot</CMD>
 <CMD state="Updater" type="push" body="send" file="mksdcard-android.sh.tar">Sending partition shell</CMD>
 <CMD state="Updater" type="push" body="$ tar xf $FILE "> Partitioning...</CMD>
 <CMD state="Updater" type="push" body="$ sh mksdcard-android.sh /dev/mmcblk0"> Partitioning...</CMD>

 <CMD state="Updater" type="push" body="$ ls -l /dev/mmc* ">Formatting sd partition</CMD>

 <CMD state="Updater" type="push" body="send" file="files/android/boot.img">Sending kernel uImage</CMD>
 <CMD state="Updater" type="push" body="$ dd if=$FILE of=/dev/mmcblk0p1">write boot.img</CMD>
 <CMD state="Updater" type="push" body="frf">flush the memory.</CMD>

 <CMD state="Updater" type="push" body="$ mkfs.ext4 -b 4096 -m 0 /dev/mmcblk0p4">Formatting data partition</CMD>
 <CMD state="Updater" type="push" body="send" file="mk-encryptable-data-android.sh.tar">Sending data partition shell</CMD>
 <CMD state="Updater" type="push" body="$ tar xf $FILE ">Extracting data partition shell</CMD>
 <CMD state="Updater" type="push" body="$ sh mk-encryptable-data-android.sh /dev/mmcblk0 /dev/mmcblk0p4">Making data encryptable</CMD>

 <CMD state="Updater" type="push" body="$ mkfs.ext4 /dev/mmcblk0p5">Formatting system partition</CMD>
 <CMD state="Updater" type="push" body="$ mkfs.ext4 /dev/mmcblk0p6">Formatting cache partition</CMD>
 <CMD state="Updater" type="push" body="frf">flush the memory.</CMD>
 <CMD state="Updater" type="push" body="$ mkfs.ext4 /dev/mmcblk0p7">Formatting device partition</CMD>
 <CMD state="Updater" type="push" body="pipe dd of=/dev/mmcblk0p5 bs=512" file="files/android/system.img">Sending and writting system.img</CMD>
 <CMD state="Updater" type="push" body="frf">flush the memory.</CMD>
 <!-- Write userdata.img is optional, for some customer this is needed, but it's optional. -->
 <!-- Also, userdata.img will have android unit test, you can use this to do some auto test. -->
<!-- <CMD state="Updater" type="push" onError="ignore" body="pipe dd of=/dev/mmcblk0p7" file="file/android/userdate.img"> Sending userdata.img(optional) </CMD>
 <CMD state="Updater" type="push" body="frf">flush the memory.</CMD>  -->
 <CMD state="Updater" type="push" body="pipe dd of=/dev/mmcblk0p2 bs=512" file="files/android/recovery.img">Sending and writting recovery.img</CMD>

<!--Here strat add-->
    <CMD state="Updater" type="push" body="$ ls -la /sys/fsl_otp ">Showing HW_OCOTP fuse bank</CMD>
    <CMD state="Updater" type="push" body="$ echo 0x84267139 > /sys/fsl_otp/HW_OCOTP_GP1">write 0x84267139 to HW_OCOTP_GP1 fuse bank</CMD>
<!--Here end-->

 <CMD state="Updater" type="push" body="frf">Finishing rootfs write</CMD>

 <CMD state="Updater" type="push" body="$ echo Update Complete!">Done</CMD>
</LIST>

ref:
NXP community
NXP community
Boundary