Hi Vagrant, On 05/10/16 22:24, Nishanth Menon wrote: > On 10/05/2016 12:56 PM, Vagrant Cascadian wrote: >> After some months of putting it on the back burner, I finally managed to >> get the BeagleBoard X15 booting with rootfs on eSATA using Debian's >> modularized kernel, with u-boot-omap 2016.09+dfsg1-1 and >> linux-image-4.8.0-rc8-armmp-lpae 4.8~rc8-1~exp1. >> >> The eSATA port appears to to be powered off of USB, and for some reason >> only works when compiled in. I haven't tried with an externally powered >> eSATA device. >> >> The workaround seems to be calling "usb start" from u-boot (which reset >> the board on older versions of mainline u-boot). >> >> With linux 4.6, it worked fine with the following compiled as built-ins, >> without the workaround: >> >> CONFIG_OMAP_CONTROL_PHY=y >> CONFIG_TI_PIPE3=y >> CONFIG_OMAP_OCP2SCP=y >> >> >> Ideally this would work regardless of being compiled as a module or a >> built-in, or initializing usb from u-boot... I'm not sure if the issue >> is in u-boot or linux. But at least this is a useable workaround for >> now. Great!! thanks for the update. I believe the issue is kind of related to both u-boot and kernel due to Errata i818 SATA PHY Reset Required Following SATA PLL Unlock http://www.ti.com/lit/er/sprz429j/sprz429j.pdf u-boot is not powering down SATA as per that recommendation. As long as SATA_DPLL is not unlocked/powered down at any point i818 won't occur. But if the TI_PIPE3 and related drivers are not built-in then there is a small window where the SATA PLL is unlocked and so SATA breaks. (due to kernel auto-idling unused clocks?) The right fix would be to make sure SATA is shutdown in u-boot and workaround for i818 is applied there. I will take this as an action item for me. cheers, -roger -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
