<div dir="ltr"><div><span style="font-family:"Times","serif"">Through ssh login on CentOS, we set /dev/ttyS0 to work in polling mode by making its irq=0 using the following command <br></span></div><div><br><span style="font-family:"Times","serif""></span></div><div><span style="font-family:"Times","serif""></span></div><span style="font-family:"Times","serif""> $ setserial /dev/ttyS0 uart 16550a irq 0 <br> <br> Now we are getting login prompt on serial console. <br> <br></span><div><span style="font-family:"Times","serif""> When we change /dev/ttyS0 back to interrupt mode with irq=4, we are not getting login prompt over serial console.</span></div><div><span style="font-family:"Times","serif""><br></span></div><div><span style="font-family:"Times","serif"">We do not have a serial port connected to ttyS0 of BMC. So ttyS4 of BMC is used as local-tty in obmc-console configuration.</span></div><div><span style="font-family:"Times","serif""><br></span></div><div><span style="font-family:"Times","serif"">Whether anything is required to be done in OpenBMC firmware to enable irq mode for serial redirection.<br></span></div></div><br><div class="gmail_quote"><div dir="ltr" class="gmail_attr">On Wed, Nov 6, 2019 at 7:09 PM AKASH G J <<a href="mailto:akashgj91@gmail.com">akashgj91@gmail.com</a>> wrote:<br></div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div dir="ltr">Hi all,<br><br>We are using BMC Aspeed AST-2500 in our motherboard with OpenBMC firmware. 'obmc-console' is used to get host messages over BMC. obmc-console.conf looks like <br><br><i>lpc-address = 0x3f8<br>sirq = 4<br>local-tty = ttyS4<br>local-tty-baud = 115200</i><br><br>BIOS serial redirection is enabled over COM port 0 (0x3f8, sirq=4, baudrate=115200) for super-IO.<br><br>We are getting BIOS debug messages, grub entries on BMC. But Linux booting is very slow, it is not printing systemd status messages(OK/FAILED) on serial console. Also is not giving login prompt on the serial console over BMC.<br><br><div>Please someone help to resolve the problem.</div><div><br></div><div><br></div><div>Thanks and Regards,</div><div><br></div><div>Akash<br></div></div>
</blockquote></div>