uClinux for the Blackfin Processor

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[#2920] serial driver in DMA mode spams history to console on shell restart

Submitted By: Mike Frysinger
Open Date 2007-03-06 22:35:12	Close Date 2008-02-22 01:00:45
Priority: Medium	Assignee: Sonic Zhang
Fixed In Release: N/A	Status: Closed
Found In Release: N/A	Release:
Category: N/A	Board: N/A
Processor: N/A	Silicon Revision:
Is this bug repeatable?: Yes	Resolution: Fixed
Uboot version or rev.:	Toolchain version or rev.:
App binary format: N/A
Summary: serial driver in DMA mode spams history to console on shell restart
Details: once the system boots up, if you simply exit the console shell, you should see most of the recent output written out again ... if i switch to PIO mode, this no longer happens
Details: once the system boots up, if you simply exit the console shell, you should see most of the recent output written out again ... if i switch to PIO mode, this no longer happens

Follow-ups
--- Aubrey Li 2007-03-13 06:26:28 Is this exactly what your mean? ================================== root:~> uname -a Linux blackfin 2.6.19.3-ADI-2007R1-pre-svn2784 #9 Tue Mar 13 17:55:35 CST 2007 blackfin unknown root:~> exit BusyBox v1.4.1 (2007-02-28 16:58:25 CST) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> ======================================================================== If you can replicate the issue, please post the kernel revision.
--- Mike Frysinger 2007-03-13 14:20:31 hmm, 'exit' works, but i typically dont do that ... i hit CTRL+D :) so this is what i see using exit (which is OK): ======================================================================== Freeing unused kernel memory: 56k freed (0x114000 - 0x121000) dma_alloc_init: dma_page @ 0x0011d000 - 256 pages at 0x03f00000 Welcome to: ____ _ _ / __\| \|\|_\| _ _ _ _\| \| \| \| _ ____ _ _ \ \/ / \| \| \| \| \| \| \|\| \| _ \\| \| \| \| \ / \| \|_\| \| \|__\| \|\| \| \| \| \| \|_\| \| / \ \| ___\____\|_\|\|_\|_\| \|_\|\____\|/_/\_\ \|_\| For further information see: http://www.uclinux.org/ http://blackfin.uclinux.org/ BusyBox v1.4.1 (2007-03-12 19:07:32 EDT) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> uname -a Linux blackfin 2.6.19.3-ADI-2007R1-pre-svn2839 #81 Tue Mar 13 13:39:48 EDT 2007 blackfin unknown root:~> exit BusyBox v1.4.1 (2007-03-12 19:07:32 EDT) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> ======================================================================== and here's what i get when using CTRL+D (note that while it says "exit" in the middle, that's busybox displaying it): ======================================================================== Freeing unused kernel memory: 56k freed (0x114000 - 0x121000) dma_alloc_init: dma_page @ 0x0011d000 - 256 pages at 0x03f00000 Welcome to: ____ _ _ / __\| \|\|_\| _ _ _ _\| \| \| \| _ ____ _ _ \ \/ / \| \| \| \| \| \| \|\| \| _ \\| \| \| \| \ / \| \|_\| \| \|__\| \|\| \| \| \| \| \|_\| \| / \ \| ___\____\|_\|\|_\|_\| \|_\|\____\|/_/\_\ \|_\| For further information see: http://www.uclinux.org/ http://blackfin.uclinux.org/ BusyBox v1.4.1 (2007-03-12 19:07:32 EDT) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> uname -a Linux blackfin 2.6.19.3-ADI-2007R1-pre-svn2839 #81 Tue Mar 13 13:39:48 EDT 2007 blackfin unknown root:~> exitlcome to: ____ _ _ / __\| \|\|_\| _ _ _ _\| \| \| \| _ ____ _ _ \ \/ / \| \| \| \| \| \| \|\| \| _ \\| \| \| \| \ / \| \|_\| \| \|__\| \|\| \| \| \| \| \|_\| \| / \ \| ___\____\|_\|\|_\|_\| \|_\|\____\|/_/\_\ \|_\| For further information see: http://www.uclinux.org/ http://blackfin.uclinux.org/ BusyBox v1.4.1 (2007-03-12 19:07:32 EDT) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> uname -a Linux blackfin 2.6.19.3-ADI-2007R1-pre-svn2839 #81 Tue Mar 13 13:39:48 EDT 2007 blackfin unknown root:~> exit BusyBox v1.4.1 (2007-03-12 19:07:32 EDT) Built-in shell (msh) Enter 'help' for a list of built-in commands. root:~> ========================================================================
--- Aubrey Li 2007-03-13 23:50:29 So the problem is the difference between "exit" and "ctrl -d". I don't think there is a bug in the serial driver which causes that.
--- Mike Frysinger 2007-03-14 00:07:57 switching to PIO doesnt exhibit the issue ...
--- Robin Getz 2007-03-27 23:26:33 On trunk (not release branch), I did a "reboot", and got spammed by a bunch of previous output - the output was from a previous test I was running - so it doesn't look like a shell issue... root:~> root:~> reboot Jan 7 13:45:15 dhcpcd[90]: terminating on signal 15 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 0 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 0 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 0 0 2 0 1 0 1 0 0 1 1 0 0 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 0 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 2 1 1 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 2 0 1 0 1 0 0 1 1 0 0 Node 0, zone DMA 1 1 0 Restarting system.U-Boot 1.1.6-svn641 (ADI-2007R1-pre) (Mar 7 2007 - 16:57:38) CPU: ADSP BF537 Rev.: 0.2 Board: ADI BF537 stamp board Support: http://blackfin.uclinux.org/ Clock: VCO: 500 MHz, Core: 500 MHz, System: 100 MHz SDRAM: 64 MB FLASH: 4 MB In: serial Out: serial Err: serial Net: BF537 ETHERNET I2C: ready Hit any key to stop autoboot: 0 bf537> -Robin
--- Aubrey Li 2007-03-29 23:55:40 When register serial driver as a console, the funtion bfin_serial_remove() and bfin_serial_shutdown() seem be never called, even if the command "reboot" issued. I've posted a quick question on the LKML, let's see what feed back.
--- Sonic Zhang 2007-11-21 03:13:06 This bug is never replicated on SVN trunk.
--- Robin Getz 2007-11-21 11:01:15 Sonic: Since when? I get it on trunk all the time (including yesterday). -Robin
--- Mike Frysinger 2007-11-21 11:22:13 i continue to see this as well
--- Mike Frysinger 2007-11-21 11:44:19 so we're clear, i see this problem even after all the latest changes. i just tested svn rev 3915. to reproduce, i do: - boot up fresh uImage - run: ls -R / - wait for it all to display - type: exit - see recent history incorrectly spammed
--- Sonic Zhang 2007-11-22 01:38:46 Fixed. Increase buffer tail immediately before starting tx dma.
--- Alex Landau 2008-01-16 02:45:49 I'm having a similar problem with trunk r4099. It's not about spamming history, but instead only part of my keystrokes are processed when the serial port uses DMA. Everything is fine once I switch to PIO. For example, I get the shell prompt and type "ls<enter>". What I see on the screen varies: sometimes nothing, sometimes just "l", or just "s", sometimes "ls" and very rarely "ls<enter>" with the listing of files. It seems like something "eats" some of the keystrokes...
--- Alex Landau 2008-01-16 05:56:57 I also noted that in PIO mode I get messages like "ttyBF0: 21 input overrun(s)" quite often. Usually, this means I can't use vi on the console. I guess any other curses application will hit this problem.

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Change Date	User Id	Field Name	Old Value	New Value
2008-02-22 01:00:45	Mike Frysinger	status	Open	Closed
2008-02-22 01:00:45	Mike Frysinger	close_date	None	2008-02-22 01:00:45
2007-11-22 01:38:46	Sonic Zhang	resolution18	Not reproducible	Fixed
2007-11-22 01:38:46	Sonic Zhang	assignee	Nobody	Removed
2007-11-21 03:13:06	Sonic Zhang	resolution18	None	Not reproducible
2007-09-20 22:08:18	Sonic Zhang	assignee	Aubrey Li	Removed
2007-03-06 22:43:04	Sonic Zhang	assignee	Nobody	Removed

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