On Fri, Apr 26, 2019 at 03:47:15PM +0200, StarostaCZ@xxxxxxxxx wrote: > Hello all, > we are development and manufacturing company that use your FT232R serial > converter for couple of years with our software. We consume about a > hundreds pcs of FT232R per yer. We use FT232R as USB serial converter > with direct access (no virtual serial port) and as a "hardware key" > using FTDIChip-ID. We operate our software with FT232R converters on > Windows and Debian Linux operating system. > > We have used Intel motherboards with Intel processors so far. We want to > use AMD motherboards with AMD processors too. *We made a couple of tests > on AMD motherboards with AMD processors and Debian Linux 9.6, but we > have come across a big problem. > **When we open internal EEPROM of FT232R for reading, there will arise > many error messages in system log files. And then Debian Linux crash > after some time!* > > > _1) Hardware configurations:_ > - motherboards with AMD A320M chipset: > - MSI A320M PRO-VD PLUS, > https://www.msi.com/Motherboard/support/A320M-PRO-VD-PLUS > - ASUS PRIME A320M-K, https://www.asus.com/Motherboards/PRIME-A320M-K > - GIGABYTE A320M-S2H, > https://www.gigabyte.com/Motherboard/GA-A320M-S2H-rev-1x#kf > - latest bios installed, default bios configuration loaded, > - CPU AMD Athlon 200GE, AMD Ryzen 3 2200G > - 4GB RAM, SSD drive Kingston A400 120GB > > _2a) Operating system A:_ > - Debian Linux 9.6 64bit, https://www.debian.org/distrib/, > https://cdimage.debian.org/debian-cd/current/amd64/iso-cd/debian-9.6.0-amd64-netinst.iso > - installed from Netinst installer WITHOUT graphic dekstop, default > configuration > - tested kernels > - default kernel 4.9.0.8-amd64, > https://packages.debian.org/stretch/linux-image-4.9.0-8-amd64 > - backports kernel 4.18.0-0.bpo.1-amd64, > https://packages.debian.org/stretch-backports/linux-image-4.18.0-0.bpo.1-amd64 > > _2b) Operating system B:_ > - Ubuntu server 19.04 64bit, http://releases.ubuntu.com/19.04/, > http://releases.ubuntu.com/19.04/ubuntu-19.04-live-server-amd64.iso > - installed WITHOUT graphic dekstop, default configuration > - tested kernels > - default kernel 5.0.0-amd64, > https://packages.debian.org/stretch/linux-image-4.9.0-8-amd64 > - experimental kernel 5.0.9-050009-generic amd64, > https://kernel.ubuntu.com/~kernel-ppa/mainline/v5.0.9/ > > _3) Drivers_ > - libftd2xx drivers version 1.4.8, https://www.ftdichip.com/Drivers/D2XX.htm > > _4) Performed tests_ > You can repeat this test: > - connect FT232R into USB2.0 port (not USB3 port!) > - use examples in directory: ...\libftd2xx-i386-1.4.8.tar\release\examples\ > - add parameter "-m32" to "CFLAGS" variable into "Rules.make" file > - compiled "\examples\EEPROM\user\read\" > - run script "test.sh" - see attached file > - *Debian Linux or Ubuntu server crashes after some minutes* - see > attached kernel logs from our system > - see "kern.log" https://paste.ee/p/xxIZ2 So this is a debian 4.18 kernel seemingly crashing due to a xhci or iommu issue. Can you reproduce this on a mainline kernel? If so, please post the corresponding logs to the lists and CC the xhci and iommu maintainers (added to CC). > _5) Very important note_ > *This problem occurs when FT232R is connected into USB2.0 port only!* > When it is connected into USB3 port, all works fine, no error messages, > no crash. > > _6) Other test that we made_ > - we made other tests on Windows 10 > - same configuration with ASUS PRIME A320M-K motherboard > - latest drivers + latest FTDI drivers > - FT232R connected to USB2.0 or USB3 - no problem > > - we made the same tests on Intel architecture (that we use now) > - motherboard MSI B250M PRO-VH, CPU Intel Pentium G4560, 4GB RAM, SSD > drive Kingston A400 120GB > - same operating system Debian Linux 9.6 64bit as descripted above > - FT232R connected to USB2.0 or USB3 - no problem Johan
