Stephen Warren <swarren@xxxxxxxxxxxxx> writes: > On 04/21/2015 12:09 PM, Eric Anholt wrote: >> This is my first submission of a Raspberry Pi 2 port. It can be found >> at https://github.com/anholt/linux/tree/bcm2836 >> >> I'm using the 2835 interrupt controller support, without adding the >> checks for ARM local interrupts first. That means no support for IPIs >> (and thus no SMP), no PMU events, and no local timer (I'm using the >> same 2835 peripheral one). >> >> It supports a similar featureset to Pi 1 at this point. Serial and SD >> cards work. Just one CPU supported. USB (ethernet) works if you use >> U-Boot, or my mailbox series >> (https://github.com/anholt/linux/tree/bcm2836-mbox). > > I can't quite get this to work. I think what's happening is that U-Boot > is over-writing the location of the code/data that the CPU1..3 pin loop > uses. Do you know what that address is so I can confirm that? > > I suspect this because when I load the kernel/DT in U-Boot, or when I > jump to the kernel to boot it, I see lots of extra duplicated characters > on the UART, like all 4 CPUs are booting Linux. For example: Oops, I was just extrapolating that U-Boot would work. I've quit using it because of the extra configuration work (particularly the compiled text files for the boot scripts). I haven't looked into how SMP works, because I don't have the interrupt support necessary yet (bcm2836-irq branch for hacks in that direction). And in further testing, the USB is actually not working and I'm not sure what gave me the idea that it was.
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