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+The upgrade scripts goes in a tarball with local.conf at the top level.
+
+The tree is a follows:
+.
+|-- install_list.txt
+|-- install_list.txt.md5
+|-- install.sh*
+|-- install.sh.md5
+|-- local.conf
+|-- local.conf.md5
+|-- model
+`-- repo/
+    |-- arm926ejste/
+    |   |-- busybox_1.24.1-r0.mlinux2.mlinux2.1_arm926ejste.ipk
+    |   |-- busybox-hwclock_1.24.1-r0.mlinux2.mlinux2.1_arm926ejste.ipk
+    |   |-- busybox-ifplugd_1.24.1-r0.mlinux2.mlinux2.1_arm926ejste.ipk
+    |   |-- busybox-syslog_1.24.1-r0.mlinux2.mlinux2.1_arm926ejste.ipk
+    |   |-- busybox-udhcpc_1.24.1-r0.mlinux2.mlinux2.1_arm926ejste.ipk
+    |   |-- initscripts_1.0-r155.3.40.0_arm926ejste.ipk
+    |   |-- initscripts-functions_1.0-r155.3.40.0_arm926ejste.ipk
+    |   |-- Packages
+    |   |-- Packages.gz
+    |   `-- Packages.stamps
+    `-- Packages
+
+
+
+install.sh gets executed if it exists by /etc/init.d/umountfs
+
+The files are placed in a tarball called upgrade.bin, and it
+should be located in either /var/volatile/flash-upgrade or
+/media/card/flash-upgrade to be compatible with umountfs.
+
+The file /var/volatile/do_flash_upgrade must exist and
+be owned by root for umountfs to execute the upgrade
+procedure.
+
+install_list.txt is a list of packages to
+install after the upgrade.  If some packages
+have mutual dependencies on each other, they should
+be put on the same line.
+
+The file local.conf should contain a list of
+architectures with priorities, and a list of
+repositories.
+
+The md5sums are created as follows:
+
+cat install.sh | md5sum -c install.sh.md5
+md5sum install.sh >install.sh.md5
+md5sum local.conf >local.conf.md5
+
+model is from the part of the hardware
+version before the first hyphen.
+
+Example:
+
+MTCAP-0.1       Would be MTCAP
+MTCDT-0.0       Would be MTCDT
+MTCDTIP-0.1     Would be MTCDTIP
+
+