syslinux.bbclass: make vm and live can be built together
* The vm image(hdddirect, vmdk, qcow2, vdi) and live image (hddimg, iso)
couldn't be built together because the following vars settings are
conflicted:
- SYSLINUX_ROOT (/dev/sda2 vs /dev/ram0)
- LABELS (boot vs boot install)
- INITRD (None vs live install)
- SYSLINUX_CFG (see above)
Introduce new vars (SYSLINUX_ROOT_VM/_LIVE, the samilar to others) to
make them can work together, now we can build all of them together:
IMAGE_FSTYPES += "live iso hddimg hdddirect vmdk qcow2 vdi"
* Use SYSLINUX_CFG rather than SYSLINUXCFG to keep align with others
SYSLINUX vars.
* The SYSLINUX_TIMEOUT had been set, but it didn't work since
AUTO_SYSLINUXMENU wasn't set, this would cause confusions, so also set
AUTO_SYSLINUXMENU.
* Move SYSLINUX_PROMPT and SYSLINUX_TIMEOUT to syslinux.bbclass rather
than in separate classes since they are the same.
* Set SYSLINUX_TIMEOUT to 50 to have a unique timeout for syslinux.
[YOCTO #9161]
Signed-off-by: Robert Yang <liezhi.yang@windriver.com> Signed-off-by: Ross Burton <ross.burton@intel.com>
