linux-kernel - Re: [PATCH 0/3] tty: serial: 8250

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 17 Jan 2017 15:25:37 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     Vignesh R <vigneshr@...com>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Peter Hurley <peter@...leysoftware.com>,
        Sebastian Andrzej Siewior <bigeasy@...utronix.de>,
        "linux-serial@...r.kernel.org" <linux-serial@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>
Subject: Re: [PATCH 0/3] tty: serial: 8250_omap: Enable DMA support

* Vignesh R <vigneshr@...com> [170117 02:06]:
> 
> 
> On Tuesday 17 January 2017 11:36 AM, Vignesh R wrote:
> > 
> > 
> > On Friday 13 January 2017 11:50 PM, Tony Lindgren wrote:
> >> * Vignesh R <vigneshr@...com> [170113 00:03]:
> >>> This patch series re enables DMA support for UART 8250_omap driver.
> >>>
> >>> Tested on AM335x, AM437x that use EDMA and OMAP5 and DRA74 EVM with
> >>> SDMA.
> >>
> >> Is 8250_omap serial console working for you on omap5 in general?
> >>
> >> I've noticed that it's really unresponsive for me as if the FIFO
> >> interrupt was not working. For example logging in might take several
> >> attempts and a long time with each character showing up much later
> >> after some timeout.
> >>
> > 
> > Yes, I did face the same issue on omap5 using 8250_omap driver for
> > console. Looks like this bug has existed all along.
> > 
> 
> This looks a separate issue, I don't see any errata specific errata wrt
> UART on OMAP5. I will try to debug further.

OK maybe it's something configured or not configured by the bootloader
that we're missing in the Linux driver?

Other than the omap5 issue, 8250_OMAP seems to behave on all variants
that I've tried it with so far.

Regards,

Tony