mirror of
git://projects.qi-hardware.com/xburst-tools.git
synced 2024-11-26 03:10:17 +02:00
76 lines
3.1 KiB
Plaintext
76 lines
3.1 KiB
Plaintext
=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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=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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$ make
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we 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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=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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=kernel(2.6.24)=
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here[5] is the kernel GIT URL.
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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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----
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[1] http://www.openmobilefree.net/?p=61
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[2] here is the web site
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http://github.com/lindnermarek/openwrt-x-burst/commits/x-burst
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now we put the code in github.com
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[3] in folder 'usbboot', here is the tar package and Debian package.
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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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[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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