Like many, I'm having issues with loading device tree overlays at boot.
# uname -a
Linux spa.turrim 4.4.4-1-ARCH #1 Sat Mar 5 18:30:09 MST 2016 armv7l
GNU/Linux
#
I have DS3231.dts:
/dts-v1/;
/plugin/;
/{
compatible = "ti,beaglebone", "ti,beaglebone-black";
part-number = "BBB-DS3231";
version = "00A0";
fragment@0 {
target = <&i2c2>;
__overlay__ {
pinctrl-0 = <&i2c2_pins>;
clock-frequency = <100000>;
status = "okay";
rtc: rtc@68 {
compatible = "dallas,ds1307";
#address-cells = <1>;
#size-cells = <0>;
reg = <0x68>;
};
};
};
};
I have compiled it and put the .dtbo in /lib/firmware:
# ls -l /lib/firmware/DS3231-00A0.dtbo
-rw-r--r-- 1 root root 699 Feb 22 21:35 /lib/firmware/DS3231-00A0.dtbo
#
Interactively it works:
# echo DS3231 > /sys/devices/platform/bone_capemgr/slots
produces:
[ 4082.171481] bone_capemgr bone_capemgr: part_number 'DS3231', version
'N/A'
[ 4082.178999] bone_capemgr bone_capemgr: slot #4: override
[ 4082.184502] bone_capemgr bone_capemgr: Using override eeprom data at
slot 4
[ 4082.191512] bone_capemgr bone_capemgr: slot #4: 'Override Board
Name,00A0,Override Manuf,DS3231'
[ 4082.216295] rtc-ds1307 2-0068: rtc core: registered ds1307 as rtc1
[ 4082.222530] rtc-ds1307 2-0068: 56 bytes nvram
[ 4082.237260] bone_capemgr bone_capemgr: slot #4: dtbo 'DS3231-00A0.dtbo'
loaded; overlay id #0
and
# cat /sys/devices/platform/bone_capemgr/slots
0: PF---- -1
1: PF---- -1
2: PF---- -1
3: PF---- -1
4: P-O-L- 0 Override Board Name,00A0,Override Manuf,DS3231
#
So I ask to have it enabled at boot:
# cat /boot/uEnv.txt
optargs=coherent_pool=1M bone_capemgr.enable_partno=BBB-DS3231
#
and I get this in dmesg:
# dmesg | grep bone
[ 0.000000] Kernel command line: console=ttyO0,115200n8 coherent_pool=1M
bone_capemgr.enable_partno=BBB-DS3231 root=PARTUUID=0e4f7ccd-01 rw rootwait
fixrtc
[ 4.950284] bone_capemgr bone_capemgr: Baseboard:
'A335BNLT,00C0,3214BBBK9247'
[ 4.957585] bone_capemgr bone_capemgr:
compatible-baseboard=ti,beaglebone-black - #slots=4
[ 5.023585] bone_capemgr bone_capemgr: slot #0: No cape found
[ 5.083600] bone_capemgr bone_capemgr: slot #1: No cape found
[ 5.143596] bone_capemgr bone_capemgr: slot #2: No cape found
[ 5.203580] bone_capemgr bone_capemgr: slot #3: No cape found
[ 5.209370] bone_capemgr bone_capemgr: enabled_partno PARTNO
'BBB-DS3231' VER 'N/A' PR '0'
[ 5.217685] bone_capemgr bone_capemgr: slot #4: override
[ 5.223023] bone_capemgr bone_capemgr: Using override eeprom data at
slot 4
[ 5.230034] bone_capemgr bone_capemgr: slot #4: 'Override Board
Name,00A0,Override Manuf,BBB-DS3231'
[ 5.239545] bone_capemgr bone_capemgr: initialized OK.
[ 6.259420] bone_capemgr bone_capemgr: loader: failed to load slot-4
BBB-DS3231:00A0 (prio 0)
#
Is this a case of /lib/firmware not being available yet? I see people with
Debian fiddling with initramfs in similar situations...?
--
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