Error while booting rpi4 / start4.elf: is not compatible

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07 May 2022 07:25 #242213 by RMey
Hi, I'm new to linuxcnc and I have the following problem:

I have a 2gb rpi4 on which I'm trying to install linuxcnc 2.8.1. I'm using rpi-imager to flash the sd-card, no problems there. When I boot up the rpi I get this error "start4.elf: is not compatible", "this board requires newer software", (see picture). On some non linuxcnc forum on a similar case I found some advice to replace the start4.elf file in the rpi boot folder with the start4.elf file found in the boot folder of the rpi firmware found on github (github.com/raspberrypi/firmware). Trying to boot after this I get the error "Error, CPU 0 not supported!" (see picture), but it does boot up and I'm able to change my settings etc. On latency test I'm getting 50 000ns and as far as I'm concerned that's very high.

I'm quite lost right now so if I left out some important details just ask and I will provide them.
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07 May 2022 09:25 #242223 by tommylight

On latency test I'm getting 50 000ns and as far as I'm concerned that's very high.

Not sure about the rest, but, 50K latency for a RPI is very, very good.

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