Report: FreeBSD on Rpi4 8 GB model

[Robert Crowston]

> No, SPIN_PAGES=2 is fine

I confirm that CONFIG_RPI_EFI_NR_SPIN_PAGES 2 is sufficient.

> Even without this setting, it should still largely boot;
> you'll just only have half the memory you wanted.

Without raising the spin pages limit, the kernel panics while trying to start the secondary CPUs. I don't have a working JTAG so I can't diagnose exactly why, but the spin table thing seemed like an obvious thing to check.

Starting CPU 1 (1)
panic: Failed to start CPU 1 (1), error 16

cpuid = 0
time = 1
KDB: stack backtrace:
db_trace_self() at db_trace_self_wrapper+0x28
         pc = 0xffff00000075cd0c  lr = 0xffff00000010a0ac
         sp = 0xffff000000010590  fp = 0xffff000000010790

db_trace_self_wrapper() at vpanic+0x194
         pc = 0xffff00000010a0ac  lr = 0xffff0000004185c0
         sp = 0xffff0000000107a0  fp = 0xffff0000000107f0

vpanic() at panic+0x44
         pc = 0xffff0000004185c0  lr = 0xffff000000418368
         sp = 0xffff000000010800  fp = 0xffff0000000108b0

panic() at start_cpu+0x224
         pc = 0xffff000000418368  lr = 0xffff00000076bd94
         sp = 0xffff0000000108c0  fp = 0xffff0000000108c0

start_cpu() at cpu_init_fdt+0x34
         pc = 0xffff00000076bd94  lr = 0xffff00000076b094
         sp = 0xffff0000000108d0  fp = 0xffff000000010930

cpu_init_fdt() at ofw_cpu_early_foreach+0x180
         pc = 0xffff00000076b094  lr = 0xffff00000020e0cc
         sp = 0xffff000000010940  fp = 0xffff000000010990

ofw_cpu_early_foreach() at mp_start+0x8c
         pc = 0xffff00000020e0cc  lr = 0xffff000000472e98
         sp = 0xffff0000000109a0  fp = 0xffff0000000109f0

mp_start() at mi_startup+0x12c
         pc = 0xffff000000472e98  lr = 0xffff0000003abfcc
         sp = 0xffff000000010a00  fp = 0xffff000000010a20

mi_startup() at virtdone+0x5c
         pc = 0xffff0000003abfcc  lr = 0xffff00000000108c
         sp = 0xffff000000010a30  fp = 0x0000000000000000

KDB: enter: panic


‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Saturday, 6 June 2020 20:29, Klaus Küchemann via freebsd-arm <freebsd-arm at freebsd.org> wrote:

>
>
> > Am 06.06.2020 um 21:19 schrieb Kyle Evans kevans at freebsd.org:
> > On Sat, Jun 6, 2020 at 2:13 PM Klaus Küchemann via freebsd-arm
> > freebsd-arm at freebsd.org wrote:
> >
> > > > Am 06.06.2020 um 20:15 schrieb Robert Crowston via freebsd-arm freebsd-arm at freebsd.org:
> > > > …...
> > > > Edit board/raspberrypi/rpi/Kconfig, set RPI_EFI_NR_SPIN_PAGES to a larger number (I picked 10, probably too big, but it was easier than doing the arithmetic).
> > > > ……
> > >
> > > You mean that https://reviews.freebsd.org/D24085 rpi4_fragment has to set SPIN_PAGES from 2 to 10 ?
> > > This could be done in sysutils/u-boot-rpi4 , perhaps with something like an #ifdef RPI4/8GB“ for the first try .
> >
> > No, SPIN_PAGES=2 is fine; the default in upstream is 1 because they
> > don't need any more, so he would've needed to manually bump it to 2.
> > You should be able to just add CONFIG_NR_DRAM_BANKS=8 to
> > sysutils/u-boot-rpi4's rpi4_fragment and it 'just work' -- this was
> > tested on IRC a couple days ago, and should be safe for all variants
> > as far as I'm aware (but needed to test on my 4GB variant). Even
> > without this setting, it should still largely boot; you'll just only
> > have half the memory you wanted.
> > Thanks,
> > Kyle Evans
>
> Ah, thanks a lot !
> So it was too hasty from me to post to https://reviews.freebsd.org/D24085 :-)
> Regards
> Klaus
>
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