This is a minimalistic bootloader meant to run from BRAM.
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This is a minimalistic bootloader meant to run from BRAM.
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Upon reset, it will read file '/code.bin' from the DE-1 board SD card, load it
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Upon reset, it will read file '/code.bin' from the DE-1 board SD card, load it
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at address 0x00000000 and then jump to that address.
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at address 0x00000000 and then jump to that address.
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Any program meant to be bootloaded in this way has to be compiled with link
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Any program meant to be bootloaded in this way has to be compiled with link
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script 'xram.lds', and the binary renamed 'code.bin'. See the 'Adventure' demo
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script 'xram.lds', and the binary renamed 'code.bin'. See the 'Adventure' demo
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(makefile target 'sd') for an example.
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(makefile target 'sd') for an example.
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In this directory you'll find a copy of the Adventure binary called 'code.bin'
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that you can use to try the bootloader. Just put it in the root directory of
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a FAT32 SD card and load this demo (and hope the card format is understood by
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the FAT library...).
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This program is built around elm-chan's FAT32 library, which has been ported
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This program is built around elm-chan's FAT32 library, which has been ported
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to the ION SoC using a bitbanged interface. This should be easy to port to other
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to the ION SoC using a bitbanged interface. This should be easy to port to other
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boards.
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boards.
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The binary will be truncated to 256KB.
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The binary will be truncated to 256KB.
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Uses serial port console at 19200/8/N/1.
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Uses serial port console at 19200/8/N/1.
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Run 'make demo' and synthesize as instructed for the 'Hello World' demo.
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Run 'make demo' and synthesize as instructed for the 'Hello World' demo.
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This program is meant to be synthesized and used as a bootloader for
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This program is meant to be synthesized and used as a bootloader for
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demonstration or development, running from BRAM. It is too large to be run from
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demonstration or development, running from BRAM. It is too large to be run from
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BRAM in a real application; it should be modified to run from flash instead --
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BRAM in a real application; it should be modified to run from flash instead --
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or you might use another bootloader, assuming you get it to compile and run
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or you might use another bootloader, assuming you get it to compile and run
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on the MIPS-I core...
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on the MIPS-I core...
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This demo is not meant to be simulated in Modelsim or in software, no support
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This demo is not meant to be simulated in Modelsim or in software, no support
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is provided for that.
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is provided for that.
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