README: hello world needs 16KB of RAM

STACK_TOP is at 0x2000 (8K) so we need something larger as a minimum.

Signed-off-by: Joel Stanley <joel@jms.id.au>
jtag-port
Joel Stanley 5 years ago
parent 97e3d47a13
commit 04b784011a

@ -94,9 +94,9 @@ fusesoc library add microwatt /path/to/microwatt/
- Build using FuseSoC. For hello world (Replace nexys_video with your FPGA board such as --target=arty_a7-100): - Build using FuseSoC. For hello world (Replace nexys_video with your FPGA board such as --target=arty_a7-100):


``` ```
fusesoc run --target=nexys_video microwatt --memory_size=8192 --ram_init_file=/path/to/microwatt/fpga/hello_world.hex fusesoc run --target=nexys_video microwatt --memory_size=16384 --ram_init_file=/path/to/microwatt/fpga/hello_world.hex
``` ```
You should then be able to see output via the serial port of the board (/dev/ttyUSB1, 115200 for example assuming standard clock speeds). There is a know bug where initial output may not be sent - try the reset (not programming button on your board if you don't see anything. You should then be able to see output via the serial port of the board (/dev/ttyUSB1, 115200 for example assuming standard clock speeds). There is a know bug where initial output may not be sent - try the reset (not programming button) on your board if you don't see anything.


- To build micropython (currently requires 1MB of BRAM eg an Artix-7 A200): - To build micropython (currently requires 1MB of BRAM eg an Artix-7 A200):



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