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edison partition management

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i would like to add a new partition named but have some questions

 

Increasing the Root Partition Size why does ota not work if the root partition size is over 640 ?

i thought as long as the partition is smaller than available ram ota should work, so in theory 768 should also work?

 

i assume i need to change the following files:

 

meta-edison-distro/recipes-bsp/u-boot/files/edison.env

change

rootfs size

add

name=NEWNAME,size=512MiB,uuid=${uuid_????};

 

meta-edison-distro/recipes-core/images/edison-image.bb

change

IMAGE_ROOTFS_SIZE

 

meta-edison-distro/recipes-core/base-files/base-files/fstab

add

/dev/disk/by-partlabel/NEWNAME     /NEWNAME       auto    noauto,x-systemd.automount,nosuid,nodev,noatime,discard,barrier=1,data=ordered,noauto_da_alloc 1   1

 

meta-edison-distro/recipes-core/first-install/files/first-install.sh

add

# format partition NEWNAME to ext4

mkfs.ext4 -m0 /dev/disk/by-partlabel/NEWNAME

fi_assert $? "Formatting NEWNAME partition"

 

is this the right way?

 

where are variables like ${uuid_disk}, ${uuid_uboot1}, .... defined?


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