From mboxrd@z Thu Jan 1 00:00:00 1970 From: bugzilla at busybox.net Date: Sat, 11 Mar 2017 13:36:06 +0000 Subject: [Buildroot] [Bug 9726] New: Raspberry Pi version B - Problems with UART speed in Buildroot 2016.11.2 and 2017.2 Message-ID: List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net https://bugs.busybox.net/show_bug.cgi?id=9726 Bug ID: 9726 Summary: Raspberry Pi version B - Problems with UART speed in Buildroot 2016.11.2 and 2017.2 Product: buildroot Version: 2016.11 Hardware: PC OS: Linux Status: NEW Severity: normal Priority: P5 Component: Other Assignee: unassigned at buildroot.uclibc.org Reporter: wzab01 at gmail.com CC: buildroot at uclibc.org Target Milestone: --- We have a lab equipped with old Respberry Pi version B. To allow student to modify the system image without removing and inserting SD cards (which killed them in a few weeks), we use U-Boot bootloder, patched so that it passes the boot parameters prepared via a standard RPi firmware. I wanted to update our environment to Buildroot 2016.11.2 in this semester. Unfortunately, it appears, that the U-Boot does not set the UART speed properly in that scenario. I've meassured the UART speed with the oscilloscope, and it appeared, that it is equal to ca. 1840 kb/s. However, the kernel uses the correct UART speed - 115.2 kb/s. I've also tested the operation with the Buildroot 2017.2 In this case things are even more interesting. The U-Boot sets the UART speed correctly to 115.2 kb/s, but hte kernel works at 921.6 kb/s What can be the reason of the experienced problems? Can I easily cure them with the settings done in the config.txt file? TIA & Regards, Wojtek -- You are receiving this mail because: You are on the CC list for the bug.