On Fri, Mar 20, 2015 at 10:16:49AM -0400, Alan Stern wrote: > Peter: > > Are there any known errata for the root-hub Transaction Translator in > the Freescale host controllers? > > When debugging some problems in an i.MX51 system, I found that the host > controller would never issue more than 4 full-speed isochronous packets > in any frame, no matter how many siTDs were linked into the EHCI > schedule. Sometimes it would issue only 1 or 2 packets, even though > eight were in the schedule! The behavior was very erratic. > > The controller seemed to work okay when the full-speed devices were > behind a high-speed hub. The problems came up only when the host > controller was connected to a full-speed hub. > > Alan Stern > Hi Alan, When look at below imx51 errata, it does not describe this issue, I will talk with IC guys about it next Monday. http://cache.freescale.com/files/dsp/doc/errata/IMX51CE.pdf -- Best Regards, Peter Chen -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
