Adding custom executables and files into Linux rootfs

[Rajat Rao]

Hello,

I was able to port Rocket+L2 config onto a Zynq FPGA on ZCU106 and can boot Linux. I would like to run SPEC benchmarks under Linux. I have the compiled SPEC executables and was able to run it using the old fpga-zynq method because we created the initramfs and kernel ourselves. I don't know how to do that now with firemarshal and a 30 MB limit on image size. And, obviously, SPEC benchmarks are HUGE.

Questions -

1. How do I overcome the 30 MB limit? Is there a way to access the second partition on the SD card after booting? My guess is there isn't...I remember reading somewhere that there is no support for block devices. Should I just increase the limit and rebuild?

2. Is there a way to pass an existing kernel vmlinux image to firemarshal to simply package along with the bootloader and create an image? This gives me greater control over what I want to put in the initramfs rather than doing it via firemarshal.

3. If answer to (2) is "No", then is there an example for adding custom programs using firemarshal?

[Philipp Schmitz]

Hello,

1. Yes, you should be able to mount the second partition of the SDCard (although I have no experience with your config itself). mount -t  hfsplus /dev/mmcblk0p2 <your_path> should work if you set up your SDCard according to the Chipyard tutorial. (also see:  https://groups.google.com/g/chipyard/c/TLwytgq9g5A)

2. idk

3. check out https://github.com/ucb-bar/spec2017-workload but I would recommend 1.

[Dakota Berbrich]

Rajat,

Did you use the older fpga-zynq platform for getting the ZCU106 up and running? Or did you implement the shell and overlays found in 'chipyard/fpga/'  and 'chipyard/fpga/fpga-shells'?

Let me know,

Thanks