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Altera_Forum's avatar
Altera_Forum
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21 years ago

Code download over LVDS

I have been considering using Redboot as my bootloader. But, our custom board has to download it's code over an LVDS link. How hard is it to add new comms options to Redboot? This is the only ...
Altera_Forum's avatar
Altera_Forum
Icon for Honored Contributor rankHonored Contributor
21 years ago

If you want to run all the console I/O over this channel, then you will need to provide a comms driver.

The functions required by Redboot for a comms driver aren't particularly complicated. If you take a look at:

altera_avalon_jtag_uart_diag.c

that should serve as a reasonable example.

These can (and should) be polled functions, i.e. you shouldn't be using interrupts to drive the device.

Initialising the channel is achieved by calling the macros CYGACC_COMM_IF_WRITE_SET etc. as done for the JTAG UART.