Report: FreeBSD on Rpi4 8 GB model

[Robert Crowston]

Fixed the JTAG. Turns out the RTCK signal is now apparently required, despite ARM emphatically declaring it isn't. It's not documented anywhere but on the FTDI FT232H it's the blue wire (labelled "GPIOL3" on the circuit diagram), goes to pin 16 on the board.

‐‐‐‐‐‐‐ Original Message ‐‐‐‐‐‐‐
On Saturday, 6 June 2020 19:15, Robert Crowston via freebsd-arm <freebsd-arm at freebsd.org> wrote:

> What works:
>
> -   FreeBSD SMP (see below)
> -   All 8 GB of memory (less video RAM).
>
>     What does not work on the 8 GB model (but does work on the 4 GB model):
>
> -   xhci (with my driver, there has been a change in the way the firmware is loaded)
> -   ethernet (genet0 is detected fine, appears to be up, but no packets go over the interface)
> -   JTAG debugging (urgh)
>
>     dmesg: https://dmesgd.nycbug.org/index.cgi?do=view&id=5534
>
>     You will need the latest u-boot. The one in pkg doesn't work. I compiled from head: https://github.com/u-boot/u-boot.git
>
>     For SMP, you need also need to tell u-boot not to clobber over our processor start up function set up by armstub8-gic.bin.
>
>     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).
>
>     $ CROSS_COMPILE=aarch64-none-elf- gmake rpi_4_defconfig
>     $ CROSS_COMPILE=aarch64-none-elf- gmake
>
>     Overwrite the u-boot.bin file on your sdcard with the one just built.
>
>     You will also need the latest versions of the pi4 firmware files on your MSDOS partition, bcm2711-rpi-4-b.dtb, fixup4.dat, start4.elf, and the overlays/ directory.
>
>
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