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README
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README
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Prepare for Reflash Device
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--------------------
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=serial console=
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take off the cover of PCB, then you will send the "GND" and "TXD"
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and th TP74 is the "RXD", you can get serial output from those pins
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you need a TTL <-> RS232 converter. here[1] is the serial PIN in the board.
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at the back of Ben Nanonote, there is "GND", "TXD" and "RXD",
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you can get serial output from those pins
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you need a TTL <-> RS232 converter. because the Ben Nanonote serial
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console is TTL. here[1] is the serial PIN in the board.
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=toolchain=
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$ git clone git://github.com/lindnermarek/openwrt-x-burst.git[2]
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$ git checkout --track -b x-burst origin/x-burst
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$ make menuconfig
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(select 'XBurst JZ47x0 [2.6]' in Target System
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for configure the u-boot in setp: 4)
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(select 'XBurst JZ47x0 [2.6]' in 'Target System')
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$ make
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we will get toolchain under /PATH/TO/openwrt-x-burst/staging_dir/
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then you will get toolchain under /PATH/TO/openwrt-x-burst/staging_dir/
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toolchain-mipsel_gcc-4.1.2_uClibc-0.9.30.1/usr/bin
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=xburst-tools (reflash tools)=
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you can get source in git://github.com/xiangfu/xburst-tools.git[3]
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=xburst-tools (usbboot tools)=
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you can get source code at git://github.com/xiangfu/xburst-tools.git[3]
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$ cd /PATH/TO/xburst-tools/usbboot
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$ ./autogen.sh && ./configure && make && sudo make install
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then you got the 'usbboot' command. that is for the reflash.
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=u-boot=
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in openWRT menuconfig-->Target Images-->Build U-Boot bootloader -->
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U-Boot target board (NEW) --> input 'qi_lb60'
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here[4] is the u-boot github URL
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in openWRT menuconfig-->Target Images-->Build U-Boot bootloader -->
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U-Boot target board (NEW) --> input 'qi_lb60
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here[4] is the u-boot github URL
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$ make qi_lb60_config
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$ make
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there is 'u-boot-nand.bin' is for Ben
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=kernel(2.6.24)=
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here[5] is the kernel GIT URL.
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here[5] is the kernel GIT URL. this kernel is work in Ben Nanonote.
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yes. there is another kernel in openWRT(2.6.28), it's will work later :-)
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$ make qi_lb60_defconfig
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$ make uImage
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there is 'arch/mips/boot/uImage' for Ben.
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=CPU Jz4740=
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Jz4740 is a multimedia application processor targeted at mobile devices
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PMP. Incorporates the XBurst CPU core based on leading
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micro-architecture technology, this processor provides high integration,
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high performance and a low power consumption solution for embedded devices.
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Boot up
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The Jz4740 can be set to boot from NOR or NAND.
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If booted from NAND, the CPU fetches the first page from NAND and uses the
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first 4 bytes on it to know how the NAND chip should be treated (16/8-bit
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bus, 2/3 row cycles). After that it copies the first 8kB from NAND and
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copies it to the I-Cache for execution.
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Ingenic Media Extension Instruction Set
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According to the MXU User Guide, the XBurst processor supports additional
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instructions called the Ingenic Media Extension Instruction Set (they
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call it an SIMD instruction set).
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Excerpt from the PDF:
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Processors (such as the Jz4740) have 60 extra SIMD commands used for the
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optimization of multimedia codecs such as MPEG4, H264, VC-1, RMVB, ...
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and other multimedia decoder algorithms that can be optimized using the MXU.
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Image Processing Unit
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The Jz4740 also has an IPU which has the following features:
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* Video frame resize
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* Color space conversion: 420/444/422 YUV to RGB convert
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=debian package=
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1. run 'dh_make'
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2. edit the file under 'debian' folder (create by 'dh_make')
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3. run 'dpkg-buildpackage -rfakeroot' to create the deb package and source
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package
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How To Reflash
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--------------------
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1. plug the Ben to your computer. direct connect. no usb hub.
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2. short the two pin ('boot from usb' show in [1])
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3. press 'RESET' at the back of Ben
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4. in you computer run [6] and [7]. then you flashed the bootloader and kernel
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to nand flash.
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5. rootfs: format your SD card.
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the first partition must VFAT and others is EXT2.
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we can put the kernel(uImage) in the first partition. put the rootfs in second partition.
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download the rootfs [8], uncompress it to second partition of SD card
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6. now you can boot your Ben.
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----
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[1] http://www.openmobilefree.net/?p=61
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@ -67,9 +60,26 @@ http://github.com/lindnermarek/openwrt-x-burst/commits/x-burst
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http://cloud.github.com/downloads/xiangfu/xburst-tools/xburst-tools_0.0_200906.tar.gz
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http://cloud.github.com/downloads/xiangfu/xburst-tools/xburst-tools_0.0_200906-1_i386.deb
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[4] http://github.com/xiangfu/qi-u-boot/tree
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this git repos have two branch [master] [pi]
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[master] is the v2009.06
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[pi] is 1.1.6 old version.(will detele laster)
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[master] is the last u-boot.
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command: "mmc init;fatload mmc 0 0x80600000 uImage;bootm" is for boot the kernel in sd card.
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[5] git://github.com/xiangfu/qi-kernel.git
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only one master branch in kernel git. so you can just
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'git clone' and 'make uImage' to get the kernel image
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[6] flash.u-boot.sh
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--------
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#!/bin/bash
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U_BOOT=/PATH/TO/u-boot-nand.bin
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sudo ../usbboot/src/usbboot -c "\
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boot;\
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nprog 0 $U_BOOT 0 0 -n"
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[7] flash.kernel.sh
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----------
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#!/bin/bash
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START_PAGE=2048
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KERNEL=/PATH/TO/KERNEL_FOLDER/arch/mips/boot/uImage
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sudo usbboot -c "boot"
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sudo usbboot -c "nprog $START_PAGE $KERNEL 0 0 -n"
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[8] http://www.openmobilefree.net/other/file/root26.tar.bz2
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