mirror of
git://projects.qi-hardware.com/xburst-tools.git
synced 2024-11-01 12:09:40 +02:00
49 lines
2.0 KiB
Plaintext
49 lines
2.0 KiB
Plaintext
=Cross toolchain=
|
|
you can get the cross toolchain at:
|
|
http://www.openmobilefree.net/other/file/mipseltools-gcc412-glibc261.tar.bz2
|
|
ftp://ftp.ingenic.cn/3sw/01linux/00toolchain/mipseltools-gcc412-glibc261.tar.bz2
|
|
ftp://ftp.ingenic.cn/3sw/01linux/00toolchain/jz-crosstools-src.tar.bz2
|
|
|
|
or you can build is from source:
|
|
make toolchain
|
|
|
|
=Serial Console=
|
|
1. open the case
|
|
|
|
2. take off the cover of PCB
|
|
then you will send the "GND" and "TXD"
|
|
and th TP74 is the "RXD"
|
|
you can get serial output from those pins
|
|
|
|
3. you need a "RS-232 <--> TTL" converter to
|
|
get the correct output date
|
|
|
|
=CPU Jz4740=
|
|
Jz4740 is a multimedia application processor targeted at mobile devices
|
|
PMP. Incorporates the XBurst CPU core based on leading
|
|
micro-architecture technology, this processor provides high integration,
|
|
high performance and a low power consumption solution for embedded devices.
|
|
|
|
Boot up
|
|
The Jz4740 can be set to boot from NOR or NAND.
|
|
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).
|
|
After that it copies the first 8kB from NAND and copies it to the I-Cache for execution.
|
|
|
|
Ingenic Media Extension Instruction Set
|
|
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).
|
|
|
|
Excerpt from the PDF:
|
|
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.
|
|
|
|
Image Processing Unit
|
|
The Jz4740 also has an IPU which has the following features:
|
|
|
|
* Video frame resize
|
|
* Color space conversion: 420/444/422 YUV to RGB convert
|
|
|
|
=debian package=
|
|
1. run 'dh_make'
|
|
2. edit the file under 'debian' folder (create by 'dh_make')
|
|
3. run 'dpkg-buildpackage -rfakeroot' to create the deb package and source
|
|
package
|