Re: [PATCH V1] serial: imx: revert setup DCEDTE early and ensure DCD and RI irqs to be off
From: Fabio Estevam <festevam@gmail.com>
Date: 2017-05-24 11:52:56
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Hi Steve, On Wed, May 24, 2017 at 7:32 AM, Steve Twiss [off-list ref] wrote:
quoted hunk ↗ jump to hunk
The USB to UART connection gets corrupted. If this patch is applied to the kernel, the i.MX6 Q (quad), and only this board as far as we know, starts to fail. This does *not* change the i.MX6DL and other sabre boards have been tested on kernelci.org and do not see a problem. An NXP/Freescale SABRESD i.MX6 Q board is requred. My system for testing is to TFTP the Linux kernel over an ethernet connection. The U-boot executes okay and the UART is working at that point. When the kernel loads the console trace becomes garbled, in the sense that I get the some characters being output to the console, in the style of the kernel starting up, but they are not correct. I expect the kernel has started ok, but I am unable to read/write through the UART console because of corruptions. Console log with the output I am seeing with linux-next/v4.12-rc2--- 8< ---U-Boot 2009.08-00001-gf65536a (Jan 12 2015 - 15:47:19)
Thanks for your detailed explanation. I also have a mx6q sabresd board here, but the error did not happen when I use a recent U-Boot version. I would like to use the same U-Boot version here as well to help debugging this problem. Could you please let me know which 2009.08 branch you used? Is it any one from git.freescale.com http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/refs/heads ? Thanks, Fabio Estevam