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The flash layout on the Storlink reference design for Gemini is using 2 MB flash for the kernel, and it also insists on overwriting the partition table with default values on every boot. The same is true for the SQ201. This poses a problem on recent OpenWrt firmware as the base zImage is bigger than 2 MB. At the same time there is a ramdisk partition of 6 MB that we don't really need. The partition table looks like this: Creating 7 MTD partitions on "30000000.flash": 0x000000000000-0x000000016000 : "BOOT" 0x000000120000-0x000000320000 : "Kern" 0x000000320000-0x000000920000 : "Ramdisk" 0x000000920000-0x000000f20000 : "Application" 0x000000f20000-0x000000f40000 : "VCTL" 0x000000f40000-0x000000fe0000 : "CurConf" 0x000000fe0000-0x000001000000 : "FIS directory" On boot the "Kern" partition is copied to RAM @0x01600000 and the "Ramdisk" partition is copied to RAM @0x00800000. Then the kernel is executed. The idea with this patch is to extend the "Kern" partition with the "Ramdisk" partition to get a full 8 MB to use for the kernel. Then we put the OpenWrt JFFS2 rootfs inside the "Application" partition. We create a small assembly loop that we prepend to the "Kern" image that will copy the "Kern" from 0x0160000 and the "Ramdisk" from 0x00800000 and put them in consecutive space at 0x00400000 and execute it from there, using "Application" as rootfs. We generate 3 main files: - zImage - contains the assembly bootstrap loop and the first part of the generated kernel image - rd.gz - contains the second part of the generated kernel image - hddapp.tgz - contains the root filesystem On the SQ201 I flash these manually using the native boot loader PLATO, "Y" alternative for the zImage, "R" for the rd.gz image and "A" for hddapp.tgz. This works fine and I can now boot to prompt on the SQ201 with nothing but flash. Signed-off-by: Linus Walleij <linus.walleij@linaro.org> |
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_______ ________ __
| |.-----.-----.-----.| | | |.----.| |_
| - || _ | -__| || | | || _|| _|
|_______|| __|_____|__|__||________||__| |____|
|__| W I R E L E S S F R E E D O M
-----------------------------------------------------
This is the buildsystem for the OpenWrt Linux distribution.
To build your own firmware you need a Linux, BSD or MacOSX system (case
sensitive filesystem required). Cygwin is unsupported because of the lack
of a case sensitive file system.
You need gcc, binutils, bzip2, flex, python3.5+, perl, make, find, grep, diff,
unzip, gawk, getopt, subversion, libz-dev and libc headers installed.
1. Run "./scripts/feeds update -a" to obtain all the latest package definitions
defined in feeds.conf / feeds.conf.default
2. Run "./scripts/feeds install -a" to install symlinks for all obtained
packages into package/feeds/
3. Run "make menuconfig" to select your preferred configuration for the
toolchain, target system & firmware packages.
4. Run "make" to build your firmware. This will download all sources, build
the cross-compile toolchain and then cross-compile the Linux kernel & all
chosen applications for your target system.
Sunshine!
Your OpenWrt Community
http://www.openwrt.org