On Thu, 2007-10-25 at 22:16 +0400, Valentine Barshak wrote: > PowerPC 440EP(x) 440GR(x) processors have the same PVR values, since > they have identical cores. However, FPU is not supported on GR(x) and > enabling APU instruction broadcast in the CCR0 register (to enable FPU) > may cause unpredictable results. There's no safe way to detect FPU > support at runtime. This patch provides a workarund for the issue. > We use a POWER6 "logical PVR approach". First, we identify all EP(x) > and GR(x) processors as GR(x) ones (which is safe). Then we check > the device tree cpu path. If we have a EP(x) processor entry, > we call identify_cpu again with PVR | 0x8. This bit is always 0 > in the real PVR. This way we enable FPU only for 440EP(x). > > Signed-off-by: Valentine Barshak <[EMAIL PROTECTED]>
Why not just or-in the FPU feature bit ? Ben. _______________________________________________ Linuxppc-dev mailing list Linuxppc-dev@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-dev