machines/MNT * with i.MX8MP Module.conf: comment on UBOOT_OFFSET=0

machines/MNT Pocket Reform with i.MX8MP Module.conf

@@ -3,6 +3,8 @@ SYSIMAGE="pocket-reform-system-imx8mp"
 DTBPATH="freescale/imx8mp-mnt-pocket-reform.dtb"
 EMMC_USE=true
 EMMC_BOOT=false
+# prevent writing u-boot to sd-card because a) the imx8mplus will only read it
+# from emmc anyways and b) because UBOOT_OFFSET=0 would overwrite the MBR on it
 SD_BOOT=false
 # name of devices in /dev
 DEV_MMC="mmcblk2"
@@ -13,6 +15,8 @@ DEV_USB="sda"
 UBOOT_SHA1="7882e800a03c7b22efc1bd1c708271536b7ba20c"
 UBOOT_PROJECT="reform-imx8mp-uboot"
 UBOOT_TAG="2024-05-06"
+# when flashing to SD-card, the correct offset is 33792
+# an offset of zero would overwrite the MBR
 UBOOT_OFFSET=0
 FLASHBIN_OFFSET=0
 NEED_NONFREE=false

machines/MNT Reform 2 with i.MX8MP Module.conf

@@ -3,6 +3,8 @@ SYSIMAGE="reform-system-imx8mp"
 DTBPATH="freescale/imx8mp-mnt-reform2.dtb"
 EMMC_USE=true
 EMMC_BOOT=false
+# prevent writing u-boot to sd-card because a) the imx8mplus will only read it
+# from emmc anyways and b) because UBOOT_OFFSET=0 would overwrite the MBR on it
 SD_BOOT=false
 # name of devices in /dev
 DEV_MMC="mmcblk2"
@@ -13,6 +15,8 @@ DEV_USB="sda"
 UBOOT_SHA1="5c5bbf5214c79535a274dfbcfd748b927e7c919a"
 UBOOT_PROJECT="reform-imx8mp-uboot"
 UBOOT_TAG="2024-05-06"
+# when flashing to SD-card, the correct offset is 33792
+# an offset of zero would overwrite the MBR
 UBOOT_OFFSET=0
 FLASHBIN_OFFSET=0
 NEED_NONFREE=false