SMARC-sAL28 User Guide. Rev. 1.0
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mtd3: 000a0000 00001000 "failsafe PPA firmware"
mtd4: 00020000 00001000 "reserved"
mtd5: 00010000 00001000 "configuration store"
mtd6: 000f0000 00001000 "bootloader"
mtd7: 00040000 00001000 "DP firmware"
mtd8: 000a0000 00001000 "PPA firmware"
mtd9: 00020000 00001000 "bootloader environment"
8.6.
Watchdog
Two watchdog devices are supported by the BSP:
/dev/watchdog0 and /dev/watchdog1 are additional watchdog timers ( /dev/watchdog0 is also available
as legacy /dev/watchdog), which correspond to built-in watchdog device in LS1028A SoC;
/dev/watchdog2 is a main watchdog timer, which corresponds to watchdog device in CPLD. This watchdog
device is able to reset the CPU and to assert WDT_TIME_OUT# line on SMARC connector.
Note that KEAPI provides access only to the CPLD watchdog (/dev/watchdog2). But it can be easily changed by
adjusting a corresponding config: /etc/keapi/watchdog.conf. Please refer to /etc/keapi/watchdog_cpld.conf and
/etc/keapi/watchdog_soc.conf.
8.7.
CAN
FlexCAN controller controller and corresponding driver support operation in two modes: CAN FD and CAN 2.0. By
default a CAN FD mode, which may not be supported by some devices, is activated. To switch to CAN 2.0 mode,
following commands can be used:
# ifconfig can0 down
# ip link set can0 type can fd off
# ip link set can0 type can bitrate 1000000 #NOTE: bitrate should be adjusted
# ifconfig can0 up
8.8.
Video Output (DP and LVDS)
Depending on type of SMARC-sAL28 module, either DP or LVDS output is supported.
To activate a DP output, following actions should be performed:
DP firmware should be loaded in U-Boot before loading Linux. i.e. following command should be executed
in U-Boot prompt:
run hdpload
an “ordinary” dtb file (sl28-var34-ads2.dtb) should be loaded;
an appropriate resolution should be passed to kernel via cmdline, e.g.:
default_hugepagesz=2m hugepagesz=2m hugepages=256 video=1920x1080-32@60 cma=256M root=/dev/nfs rw
ip=dhcp
the same resolution should be defined for HDMI-A-1 output in /etc/xdg/weston/weston.ini, e.g.:
[core]
idle-time=0
[output]
name=HDMI-A-1
mode=1920x1080@60
[screen-share]
command=/usr/bin/weston --backend=rdp-backend.so --shell=fullscreen-shell.so --no-clients-resize
the list of supported resolution can be found in /var/log/weston.log
In the current version of the BSP, only two LVDS displays are supported: AUO B101UAN02.1 (1920x1200) and AM-
1280800N4TZQ (1280x800). The same actions as for DP output above should be performed to activate them, except
that a special dtb file should be used: either sl28-var3-ads2-b101uan021.dtb or sl28-var3-ads2-am1280800.dtb
depending on the model of connected display.
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