[OpenWrt-Devel] Raspberry Pi 2 sysupgrade

[John Crispin]

On 08/07/2015 19:42, Bruno Randolf wrote:
> Hi!
> 
> I have the below change to add rudimentary support for sysupgrade on the
> Raspberry Pi. I looked at the way platform_copy_config() is implemented
> for x86 and tried to do the same, but I get the following error on mount:
> 
> mount: mounting /dev/mmcblk0p2 on /mnt failed: Device or resource busy

in that case its either still flushing the cache or has not been
properly unmounted i think. you could try adding the "partprobe" tool to
force a rescan of the table but i am not sure this is the problem here

> 
> I believe I'd need some way to re-read the partition table after the dd
> command. How does it work on x86? Any ideas?

partprobe and i think fdisk had a feature for that aswell

> 
> Also would it be OK to gzip the sdcard image to save space? It
> compresses from 76M to 11M.
> 

ok, as there is not sysupgrade supported yet this change wont break
running installations



> Below is the diff, but this is not a properly formatted patch, yet.
> 
> bruno
> 
> diff --git a/target/linux/brcm2708/base-files/lib/upgrade/platform.sh
> b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh
> new file mode 100644
> index 0000000..95ade38
> --- /dev/null
> +++ b/target/linux/brcm2708/base-files/lib/upgrade/platform.sh
> @@ -0,0 +1,19 @@
> +platform_check_image() {
> +       # i know no way to verify the image
> +       return 0;
> +}
> +
> +platform_do_upgrade() {
> +       sync
> +       get_image "$1" | dd of=/dev/mmcblk0 bs=2M conv=fsync
> +       sleep 1
> +}
> +
> +## mount does not work. I think I'd need to re-read the partition table!
> +#platform_copy_config() {
> +#      echo "*** platform_copy_config called" > /dev/console
> +#      mount -t ext4 -o rw,noatime /dev/mmcblk0p2 /mnt
> +#      cp -af "$CONF_TAR" /mnt/
> +#      umount /mnt
> +#      echo "*** platform_copy_config done" > /dev/console
> +#}
> diff --git a/target/linux/brcm2708/image/Makefile
> b/target/linux/brcm2708/image/Makefile
> index e70bdd0..095cf0d 100644
> --- a/target/linux/brcm2708/image/Makefile
> +++ b/target/linux/brcm2708/image/Makefile
> @@ -28,6 +28,7 @@ define Image/Build/RaspberryPi
>         mcopy -i $(KDIR)/boot.img $(KDIR)/Image ::kernel.img  # Copy
> OpenWrt built kernel
>         ./gen_rpi_sdcard_img.sh
> $(BIN_DIR)/$(IMG_PREFIX)-sdcard-vfat-$(1).img $(KDIR)/boot.img
> $(KDIR)/root.$(1) \
>                 $(CONFIG_BRCM2708_SD_BOOT_PARTSIZE)
> $(CONFIG_TARGET_ROOTFS_PARTSIZE)
> +       gzip -k -f $(BIN_DIR)/$(IMG_PREFIX)-sdcard-vfat-$(1).img
>  endef
> 
>  define Image/Build
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