On 05/03/2013 04:53 AM, Jim Lin wrote: > On Fri, 2013-05-03 at 03:29 +0800, Stephen Warren wrote: >> On 04/29/2013 03:21 AM, Jim Lin wrote: >>> Tegra30 and Tegra114 are compatible except >>> 1. T30 takes 55 ms to finish Port Reset. T114 takes >>> 50 ms. >> >> Is that 55-vs-50 some aspect of the HW specification itself, or the >> overall result of multiple separate delays? I ask because the statement >> that one piece of HW differs from another only in a delay, especially >> where that delay is enormous in HW terms, seem very unusual. > > 50 ms comes from USB 2.0 specification for root port. > 55 ms comes from T30 Technical Reference Manual.
OK, I see this value is indeed in the TRM, so I guess the code is OK. > Overall result of multiple separate delays. That doesn't seem true though; the TRM simply documents a single 55ms delay, not a set of delays that add up to 55ms. _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
