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systemd supports a distribution hwdb.bin in /usr/lib/udev/hwdb.bin,
which is used if /etc/udev/hwdb.bin is not present. When generating the
install time hwdb, for systemd, ensure that we put it in /usr/lib/udev,
which then ensures that at boot time we do not regenerate it, unless the
system is marked for update.
This allows fragments dropped into /etc/udev/hwdb.d to be processed
correctly, but without requiring a first boot time build:
root@qemumips:~# systemctl status systemd-hwdb-update.service
* systemd-hwdb-update.service - Rebuild Hardware Database
Loaded: loaded (/usr/lib/systemd/system/systemd-hwdb-update.service; static; vendor preset: disabled)
Active: inactive (dead)
Condition: start condition failed at Wed 2020-03-04 15:18:11 UTC; 44s ago
|- ConditionPathExists=|!/usr/lib/udev/hwdb.bin was not met
|- ConditionPathExists=|/etc/udev/hwdb.bin was not met
`- ConditionDirectoryNotEmpty=|/etc/udev/hwdb.d was not met
Docs: man:hwdb(7)
man:systemd-hwdb(8)
(From OE-Core rev: 78ff610e571e4d739326520c391a37ee1f1290ae)
Signed-off-by: Alex Kiernan <alex.kiernan@gmail.com>
Acked-by: Otavio Salvador <otavio@ossystems.com.br>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
QEMU Emulation Targets ====================== To simplify development, the build system supports building images to work with the QEMU emulator in system emulation mode. Several architectures are currently supported in 32 and 64 bit variants: * ARM (qemuarm + qemuarm64) * x86 (qemux86 + qemux86-64) * PowerPC (qemuppc only) * MIPS (qemumips + qemumips64) Use of the QEMU images is covered in the Yocto Project Reference Manual. The appropriate MACHINE variable value corresponding to the target is given in brackets.