Hi Fabio, On 24 May 2017 12:53 Fabio Estevam wrote: > Subject: Re: [PATCH V1] serial: imx: revert setup DCEDTE early and ensure DCD and RI irqs to be off > On Wed, May 24, 2017 at 7:32 AM, Steve Twiss wrote: > > > 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. For the previous tests I was using a slightly modified U-Boot from an old Freescale Android release JB43_110, but I've just compiled up the standard u-boot from the Freescale git repository, and I get the same results. > 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 ? I used this tag: jb4.3_1.1.1-ga http://git.freescale.com/git/cgit.cgi/imx/uboot-imx.git/commit/?id=jb4.3_1.1.1-ga This repo is slightly modified for a project I am working on, but it only queries the I2C for devices before printing out some messages, so minor changes I think. Here's the output from the console: --- 8< --- U-Boot 2009.08 (May 24 2017 - 13:15:47) CPU: Freescale i.MX6 family TO1.2 at 792 MHz Thermal sensor with ratio = 200 Temperature: 38 C, calibration data 0x5f15527d mx6q pll1: 792MHz mx6q pll2: 528MHz mx6q pll3: 480MHz mx6q pll8: 50MHz ipg clock : 66000000Hz ipg per clock : 66000000Hz uart clock : 80000000Hz cspi clock : 60000000Hz ahb clock : 132000000Hz axi clock : 264000000Hz emi_slow clock: 132000000Hz ddr clock : 528000000Hz usdhc1 clock : 198000000Hz usdhc2 clock : 198000000Hz usdhc3 clock : 198000000Hz usdhc4 clock : 198000000Hz nfc clock : 24000000Hz Board: i.MX6Q-SABRESD: unknown-board Board: 0x63012 [POR ] Boot Device: SD I2C: ready DRAM: 1 GB MMC: FSL_USDHC: 0,FSL_USDHC: 1,FSL_USDHC: 2,FSL_USDHC: 3 In: serial Out: serial Err: serial Found PFUZE100! deviceid=10,revid=11 Net: got MAC address from IIM: 00:04:9f:02:e3:0a FEC0 [PRIME] Hit any key to stop autoboot: 0 PHY indentify @ 0x1 = 0x004dd074 FEC: Link is Up 796d Using FEC0 device TFTP from server 192.168.2.1; our IP address is 192.168.2.2 Filename 'uImage_dtb.imx6q.v4.12-rc2'. Load address: 0x12000000 Loading: ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ################################################################# ########################################################## done Bytes transferred = 5951076 (5ace64 hex) ## Booting kernel from Legacy Image at 12000000 ... Image Name: Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 5951012 Bytes = 5.7 MB Load Address: 10800000 Entry Point: 10800000 Verifying Checksum ... OK Loading Kernel Image ... OK OK --- 8< --- Regards, Stephen ��.n��������+%������w��{.n�����{��ǫ����{ay� ʇڙ���f���h������_�(�階�ݢj"��������G����?���&��
