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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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99 lines
3.5 KiB
Plaintext
99 lines
3.5 KiB
Plaintext
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ADS GraphicsClient Plus Single Board Computer
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For more details, contact Applied Data Systems or see
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http://www.applieddata.net/products.html
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The original Linux support for this product has been provided by
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Nicolas Pitre <nico@cam.org>. Continued development work by
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Woojung Huh <whuh@applieddata.net>
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It's currently possible to mount a root filesystem via NFS providing a
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complete Linux environment. Otherwise a ramdisk image may be used. The
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board supports MTD/JFFS, so you could also mount something on there.
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Use 'make graphicsclient_config' before any 'make config'. This will set up
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defaults for GraphicsClient Plus support.
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The kernel zImage is linked to be loaded and executed at 0xc0200000.
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Also the following registers should have the specified values upon entry:
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r0 = 0
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r1 = 29 (this is the GraphicsClient architecture number)
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Linux can be used with the ADS BootLoader that ships with the
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newer rev boards. See their documentation on how to load Linux.
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Angel is not available for the GraphicsClient Plus AFAIK.
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There is a board known as just the GraphicsClient that ADS used to
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produce but has end of lifed. This code will not work on the older
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board with the ADS bootloader, but should still work with Angel,
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as outlined below. In any case, if you're planning on deploying
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something en masse, you should probably get the newer board.
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If using Angel on the older boards, here is a typical angel.opt option file
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if the kernel is loaded through the Angel Debug Monitor:
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----- begin angelboot.opt -----
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base 0xc0200000
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entry 0xc0200000
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r0 0x00000000
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r1 0x0000001d
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device /dev/ttyS1
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options "38400 8N1"
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baud 115200
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#otherfile ramdisk.gz
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#otherbase 0xc0800000
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exec minicom
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----- end angelboot.opt -----
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Then the kernel (and ramdisk if otherfile/otherbase lines above are
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uncommented) would be loaded with:
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angelboot -f angelboot.opt zImage
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Here it is assumed that the board is connected to ttyS1 on your PC
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and that minicom is preconfigured with /dev/ttyS1, 38400 baud, 8N1, no flow
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control by default.
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If any other bootloader is used, ensure it accomplish the same, especially
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for r0/r1 register values before jumping into the kernel.
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Supported peripherals:
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- SA1100 LCD frame buffer (8/16bpp...sort of)
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- on-board SMC 92C96 ethernet NIC
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- SA1100 serial port
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- flash memory access (MTD/JFFS)
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- pcmcia
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- touchscreen(ucb1200)
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- ps/2 keyboard
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- console on LCD screen
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- serial ports (ttyS[0-2])
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- ttyS0 is default for serial console
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- Smart I/O (ADC, keypad, digital inputs, etc)
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See http://www.applieddata.com/developers/linux for IOCTL documentation
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and example user space code. ps/2 keybd is multiplexed through this driver
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To do:
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- UCB1200 audio with new ucb_generic layer
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- everything else! :-)
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Notes:
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- The flash on board is divided into 3 partitions. mtd0 is where
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the ADS boot ROM and zImage is stored. It's been marked as
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read-only to keep you from blasting over the bootloader. :) mtd1 is
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for the ramdisk.gz image. mtd2 is user flash space and can be
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utilized for either JFFS or if you're feeling crazy, running ext2
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on top of it. If you're not using the ADS bootloader, you're
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welcome to blast over the mtd1 partition also.
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- 16bpp mode requires a different cable than what ships with the board.
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Contact ADS or look through the manual to wire your own. Currently,
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if you compile with 16bit mode support and switch into a lower bpp
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mode, the timing is off so the image is corrupted. This will be
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fixed soon.
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Any contribution can be sent to nico@cam.org and will be greatly welcome!
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