Compiling FreeBSD 12.0 for MIPS 14kc

[Georg Bege]

Hi,

wanna give some heads up - conversation about this took mainly place in
#bsdmips @EFnet and for a short time #FreeBSD-social @Freenode.

I've posted the complete boot up here:

https://pastebin.com/6HCFJRWD


According to the Linux and /proc/cpuinfo, it says:

--------------------------------snip--------------------------------

system type        : MT7621
machine            : Unknown
processor        : 0
cpu model        : MIPS 1004Kc V2.15
BogoMIPS        : 583.68
wait instruction    : yes
microsecond timers    : yes
tlb_entries        : 32
extra interrupt vector    : yes
hardware watchpoint    : yes, count: 4, address/irw mask: [0x0ffc,
0x0ffc, 0x0ffb, 0x0ffb]
isa            : mips1 mips2 mips32r1 mips32r2
ASEs implemented    : mips16 dsp mt
shadow register sets    : 1
kscratch registers    : 0
core            : 0
VPE            : 0
VCED exceptions        : not available
VCEI exceptions        : not available
--------------------------------snip--------------------------------


I've tried to build a FreeBSD12 along with a proper kernel, now Im stuck
at loading the kernel via tftp in Uboot:

https://pastebin.com/Ujx7t4SE

Im not using compression, it seems the old U-Boot 1.1.5 only supports
LZMA and using lzma from ports gives me a decompression error.

As the paste says, Im using XIP (kernel in place) and trying to boot off
80001000, the 'md' output seems to be correct and that's where the bin
also is located in memory.

However upon start it just stucks and doesnt continue....

Im using a kernconf now which is inspired by the MT7621_FDT
configuration, this seems to be not soo wrong as  this seems to be the
same chip.


best regards,

Georg


Am 08.10.20 um 15:27 schrieb Kyle Evans:
> On Thu, Oct 8, 2020 at 7:13 AM Georg Bege <georg at bege.email> wrote:
>> Hello folks,
>>
>> Im trying to compile FreeBSD 12.0 for mips/mipshf and targetting
>> specifically an mips 14kc CPU.
>>
>> I know this is not officially supported by any means, but I want to try
>> it nonetheless.
>>
>> FreeBSD seem's to work on various platforms including a couple of MIPS
>> families like 24kc.
>>
>> At least it's supposed to work on them... the device I have at hand is
>> an EdgeRouter ER-X which is *not* an Octeon device.
>>
>> The steps buildworld seems to work fine so far, at least it compiles but
>> on buildkernel I get an error upon linking:
>>
>>     ld: unrecognised emulation mode: -Bdynamic
>>
>> It seems to come from an erroneous ld command which includes "ld -m
>> -Bdynamic", which is obviously wong.
>>
>> I just dont understand why it is there :-( Im not super familiar with
>> the inner details of the FreeBSD make files and building steps.
>>
>> Maybe someone can help me here...
> 08:19 < kevans91> hmm
> 08:20 < kevans91> actually, these are probably mostly legit
> 08:20 < kevans91> You should still do a clean build, but that almost
> certainly won't fix it on its own
> 08:22 -!- Netsplit efnet.port80.se <-> se.hub quits: rap2, hugohagog,
> @adalava, cognet, @dim, wkoszek, joneum3,
>           ganbold_, idwer, arrowd,  (+23 more, use /NETSPLIT to show
> all of them)
> 08:22 < kevans91> DELAY is defined in mips/mips/tick.c, which isn't in
> the standard sys/conf/files.mips because some
>                   platforms have their own implementation
>
> So basically, you'll need to start building your own files.ERX to
> include some of the stuff that isn't globally included; see, for
> instance, sys/mips/mediatek/files.mediatek and copy the
> mips/mips/tick.c line from that. Some of these are also being caused
> by
>
> #device loop # Network loopback
> #device ether # Ethernet support
>
> You'll need at least loop/ether for some things in the tree you're buiilding.
>
> Thanks,
>
> Kyle Evans
-------------- next part --------------
#
# MT7621_FDT -- Kernel configuration file for FreeBSD/MIPS MT7621 SoC
#
# This includes all the configurable parts of the kernel.
#
# $FreeBSD: releng/12.0/sys/mips/conf/MT7621_FDT 315141 2017-03-12 07:09:50Z manu $
#

#NO_UNIVERSE

#
# FDT_DTS_FILE should be modified to suit the target board type.
#
#makeoptions	ARCH_FLAGS="-EL -march=1004k"
makeoptions 	FDT_DTS_FILE=UBNT-ERX.dts

# Start with a base configuration
include 	"../mediatek/std.mediatek"

ident 		MT7621
#machine	mips mipshf
cpu 		CPU_MIPS1004K

# Don't build any modules by default
makeoptions 	MODULES_OVERRIDE=""

# Default rootfs device configuration, should be changed to suit target board
options 	ROOTDEVNAME=\"ufs:md0.uzip\"

# Support geom_uzip(4) compressed disk images
device 		geom_uzip
options 	GEOM_UZIP

# Support md(4) and md-based rootfs
device 		md
options 	MD_ROOT

# Interrupt controller support
device 		mtk_intr_gic

# UART device support is compiled in when uart_ns8250 is selected (default)

# SPI and SPI flash support
device 		mtk_spi_v2
device 		spibus
device 		mx25l

# GPIO and gpioled support
device 		mtk_gpio_v2
device 		gpio
device 		gpioled

# PCI support
device 		pci

# USB (ehci, ohci) support
#device 	usb
#device 	xhci

# USB umass(4) storage and da(4) support
#device 	umass
#device 	da

# CAM support, required if umass(4) is enabled above
device 		pass
device 		scbus

# Ethernet, BPF and bridge support
device 		rt
device 		bpf		# berkeley packet filter
device 		if_bridge

# Extres
options		EXT_RESOURCES
device 		clk

# Pseudo devices.
device		loop	# Network loopback
device		random	# Entropy device
device		ether	# Ethernet support
device		vlan	# 802.1Q VLAN support
device		tun	# Packet tunnel.
device		md	# Memory "disks"
device		gif	# IPv6 and IPv4 tunneling
device		firmware # firmware assist module

# crypto subsystem
#device		crypto	# core crypto support
#device		cryptodev # /dev/crypto for access to h/w