On Wed, Aug 14, 2013 at 09:53:16PM -0500, Peter A. Bigot wrote:
On 07/09/2013 02:43 AM, Naumann Andreas wrote:
In chapter 'Advisory 2.1 USB Host Clock Drift Causes USB Spec Non-compliance in Certain Configurations' of the TI Errata it is recommended to use certain div/mult values for the DPLL5 clock setup. So far u-boot used the old 34xx values, so I added the errata recommended values specificly for 36xx init only. Also, the FSEL registers exist no longer, so removed them from init.
Tested this on a AM3703 board with 19.2MHz oscillator, which previously couldnt lock the dpll5 (kernel complained). As a consequence the EHCI USB port wasnt usable in U-Boot and kernel. With this patch, kernel panics disappear and USB working fine in u-boot and kernel.
Signed-off-by: Andreas Naumann anaumann@ultratronik.de
While this patch works with Linux that has been patched for this erratum, it will cause problems with some unpatched versions of Linux.
Right. So Linux also needs to be patched for the erratum.