On Wed, 2015-06-03 at 15:48 +0100, Julien Grall wrote: > When the property "clock-frequency" is present in the DT timer node, it > means that the bootloader/firmware didn't correctly configured the
"configure" > CNTFRQ/CNTFRQ_EL0 on each processor. > > The best solution would be to fix the offending firmware/bootloader, > although it may not always be possible to modify and re-flash it. > > As it's not possible to trap the register CNTFRQ/CNTFRQ_EL0, we have > to extend xen_arch_domainconfig to provide the timer frequency to the > toolstack when the property "clock-frequency" is present to the host DT > timer node. Then, a property "clock-frequency" will be created in the guest > DT timer node if the value is not 0. > > We could have set the property in the guest DT no matter if the property > is present in the host DT. Although, we still want to let the guest > using CNTFRQ in normal case. After all, the property "clock-frequency" > is just a workaround for buggy firmware. > > Signed-off-by: Julien Grall <julien.gr...@citrix.com> > Cc: Chris Brand <chris.br...@broadcom.com> I was about to apply but: libxl_arm.c: In function ‘make_timer_node’: libxl_arm.c:468:9: error: implicit declaration of function ‘fdt_property_u32’ [-Werror=implicit-function-declaration] cc1: all warnings being treated as errors That happen on both my 32 bit build (Debian Wheezy) and my 64 bit on (Ubuntu Saucy). Ian. _______________________________________________ Xen-devel mailing list Xen-devel@lists.xen.org http://lists.xen.org/xen-devel
