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litex-hub / linux-on-litex-rocket

Run 64-bit Linux on LiteX + RocketChip
BSD 2-Clause "Simplified" License
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just scrolling LEDs #5

Closed monniaux closed 3 years ago

monniaux commented 3 years ago

On Nexys-A7, if the MODE jumper is set to JTAG:

Programming the board with openocd -f litex-boards/litex_boards/prog/openocd_xc7_ft2232.cfg -c 'transport select jtag; init; pld load 0 linux-on-litex-rocket/nexys4ddr.bit ; exit' just results in the board scrolling its LEDs without booting anything.

Is there anything else to set?

gsomlo commented 3 years ago

You're talking about the "programming mode" jumper (#9 in the linked image: https://reference.digilentinc.com/_media/reference/programmable-logic/nexys-a7/nexys-a7-callout.png

The other potentially relevant jumper is "external configuration (SD/USB)" (#23 in the image above). That one should be set to "USB".

On Tue, Jan 12, 2021 at 07:39:54AM -0800, David Monniaux wrote:

On Nexys-A7, if the MODE jumper is set to JTAG:

Programming the board with openocd -f litex-boards/litex_boards/prog/ openocd_xc7_ft2232.cfg -c 'transport select jtag; init; pld load 0 linux-on-litex-rocket/nexys4ddr.bit ; exit' just results in the board scrolling its LEDs without booting anything.

Is there anything else to set?

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gsomlo commented 3 years ago

@monniaux: Any luck? I only have the "classic" nexys4ddr board, but word on the street is that the nexys-a7 should be compatible. Not sure if we're tickling any small-but-relevant differences between the two versions of the board, but it would be nice to know if that's the case...

monniaux commented 3 years ago

Setting switches: MODE: USB/SD, JP2: USB, SW1: 1, the system boots. Thank you. I am going to run some tests !