The following posts contain some notes I took during development. I’ll update the first post when necessary.
The Braswell SMBus driver for FreeBSD is called ichsmb_pci.
Source: freebsd-src/ichsmb_pci.c at 384c7fc01983878ebbe90da5c3a309fd9b338373 · freebsd/freebsd-src · GitHub
It’s the starting point to get the fan / lcd control working.
List kernel modules
kldstat
Load modules
kldload iicbus smbus smb ichsmb
Show pci devices (lspci)
pciconf
Edit /etc/devfs.rules and add this section to enable creation of smb devices
[wdrules=101]
add path 'i2c*' mode 660 group uucp
add path 'smb*' mode 660 group uucp
add path 'ichsmb*' mode 660 group uucp
Reload these new devfs rules
devfs rule applyset
Reload ichsmb driver and you’ll see /dev/smb0 is created now.
Now poll for devices on the bus.
[root@freenas /usr/include/dev]# smbmsg -p
Probing for devices on /dev/smb0:
Device @0x10: w
Device @0x60: rw
Device @0x62: rw
Device @0x98: rw
Device @0xa0: rw
Device @0xa2: rw
Read temperatures from 2 sensors (like here)
smbmsg -s 0x98 -c 0x00 -i 1 -F %d
24 --> 36 degrees celcius
smbmsg -s 0x98 -c 0x01 -i 1 -F %d
25 --> 37 degrees celsius
I did not manage to get the stty device working yet. This is the serial config on debian, I just need to convert this info to something usable in BSD.
root@pr4100:~# dmesg | grep -C4 tty
2.259560] Serial: 8250/16550 driver, 4 ports, IRQ sharing enabled
[ 2.286971] serial8250: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
[ 2.296401] serial 0000:00:1e.3: enabling device (0000 -> 0002)
[ 2.303396] 0000:00:1e.3: ttyS1 at MMIO 0x8161e000 (irq = 18, base_baud = 2764800) is a 16550A
[ 2.313233] serial 0000:00:1e.4: enabling device (0000 -> 0002)
[ 2.320173] 0000:00:1e.4: ttyS2 at MMIO 0x8161d000 (irq = 19, base_baud = 2764800) is a 16550A
[ 2.330182] Linux agpgart interface v0.103
root@pr4100:~# cat /proc/tty/driver/serial
serinfo:1.0 driver revision:
0: uart:16550A port:000003F8 irq:4 tx:28149 rx:0 RTS|DTR
1: uart:16550A mmio:0x8161E000 irq:18 tx:0 rx:0 CTS
2: uart:16550A mmio:0x8161D000 irq:19 tx:58 rx:0
3: uart:unknown port:000002E8 irq:3
The sio module is possibly the missing link… but it’s not part of the default FreeNAS kernel.
EDIT: the sio module is outdated. Just get the uart.ko and puc.ko modules from the trueos kernel (= FreeNAS baseline).
