Changes between Version 20 and Version 21 of OpenWrt/building

Timestamp:

06/05/2019 09:59:08 PM (5 years ago)

Author:

Tim Harvey

Comment:

updated MMC disk image commands

OpenWrt/building

@@ -224 +224 @@
  * The resulting flash firmware image will be {{{gateworks/images/}}}.
 
-If you wish to create an MMC 'disk image' for Ventana boards that boot from eMMC:
-{{{#!bash
-# create an ext4 filesystem image (using mkfs from Newport BSP)
-OUT=owrt.ext4
-SIZEMB=256M # adjust this larger if bootfs.tar.gz and rootfs.tar.gz don't fit
-wget https://raw.githubusercontent.com/Gateworks/bsp-newport/master/mkfs
-chmod +x mkfs
-sudo mkfs ext4 $OUT $SIZEMB bin/imx6/gateworks-imx6-ventana-bootfs.tar.gz bin/imx6/gateworks-imx6-ventana-rootfs.tar.gz
-
+If you wish to create an MMC 'disk image' for Ventana boards that boot from eMMC or microSD:
+{{{#!bash
 # create a filesystem image
 OUTFS=owrt.ext4
-SIZEMB=256M
+SIZEFSMB=256M
 MNT=$(mktemp -d -p/tmp)
-truncate -s $SIZEMB $OUTFS
+truncate -s $SIZEFSMB $OUTFS
 sudo mkfs.ext4 -q -F -O ^64bit -L rootfs $OUTFS
 sudo mount $OUTFS $MNT
@@ -245 +238 @@
 
 # create a disk image
-OUTIMG=ventana_emmc.img
-truncate -s 1M $OUTIMG
+SIZEMB=7248M
+OUTIMG=ventana.img
+truncate -s $SIZEMB $OUTIMG
 # partition disk - single ext partition
-printf ",,L,,\n" | sudo sfdisk -uS $OUTIMG
+printf "2048,,L,,\n" | sudo sfdisk -uS $OUTIMG
 sudo dd if=ventana/images/SPL of=$OUTIMG bs=512 seek=2
 sudo dd if=ventana/images/u-boot.img of=$OUTIMG bs=512 seek=138
 sudo dd if=$OUTFS of=$OUTIMG bs=1M seek=1
+# create a compressed disk image that can be installed via U-Boot's gzwrite
+gzip -f -k $OUTIMG && ls -lh $OUTIMG*
 
 # create a jtag binary image
 mkimage_jtag --emmc -e --partconf=user $OUTIMG@user:erase_all:0x0- > $OUTIMG.bin
-
-# create a compressed disk image that can be installed via U-Boot's gzwrite
-gzip -f -k $OUTIMG && ls -lh $OUTIMG*
-}}}
- * ventana_emmc.img is a non-compressed disk image containing SPL, U-Boot and the ext4 partition which can be copied directly to a microSD or eMMC
- * ventana_emmc.bin is a JTAG'able binary image containing SPL, U-Boot and the ext4 partition
- * ventana_emmc.img.gz is a compressed disk image which can be updated via U-Boot for example with a 'gzwrite mmc $dev $loadaddr $filesize'
+}}}
+ * SIZEFSMB above is the size of the filesystem to create in MB - this needs to be large enough to accommodate the files you are putting there... a good rule of thumb is to keep it as small as possible and use {{{resize2fs}}} on it to grow it to the size of the partition you place it in after first boot
+ * SIZEMB above is the size of the disk image to create in MB which needs to be large enough to fit the filesystem + the 1MB offset of the partition table yet small enough to fit the actual device you will copy this to in the future (such as microSD or eMMC). Note that 7248M is the appropriate size for the 8GiB eMMC's that Gateworks uses
+ * ventana.img is a non-compressed disk image containing SPL, U-Boot and the ext4 partition which can be copied directly to a microSD or eMMC via:
+  - U-Boot with a 'mmc write'
+  - Linux with a 'dd if=ventana.img.gz of=$blockdev'
+ * ventana.img.gz is a compressed disk image which can be flashed onto an MMC device via:
+  - U-Boot for example with a 'gzwrite mmc $dev $loadaddr $filesize'
+  - Linux for example with a 'zcat ventana.img.gz | sudo dd of=$blockdev'
+ * ventana.bin is a JTAG'able binary image containing SPL, U-Boot and the ext4 partition
 
 To flash the file to the board, please see this link: [wiki:jtag_instructions#Instructions JTAG Programming Instructions]