mirror of
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49 lines
2.0 KiB
Plaintext
49 lines
2.0 KiB
Plaintext
=Cross toolchain=
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you can get the cross toolchain at:
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http://www.openmobilefree.net/other/file/mipseltools-gcc412-glibc261.tar.bz2
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ftp://ftp.ingenic.cn/3sw/01linux/00toolchain/mipseltools-gcc412-glibc261.tar.bz2
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ftp://ftp.ingenic.cn/3sw/01linux/00toolchain/jz-crosstools-src.tar.bz2
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or you can build is from source:
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make toolchain
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=Serial Console=
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1. open the case
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2. take off the cover of PCB
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then you will send the "GND" and "TXD"
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and th TP74 is the "RXD"
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you can get serial output from those pins
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3. you need a "RS-232 <--> TTL" converter to
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get the correct output date
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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 first 4 bytes on it to know how the NAND chip should be treated (16/8-bit bus, 2/3 row cycles).
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After that it copies the first 8kB from NAND and 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 instructions called the Ingenic Media Extension Instruction Set (they 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 optimization of multimedia codecs such as MPEG4, H264, VC-1, RMVB, ... 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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