[U-Boot-Users] Any default audio card driver in U-boot?

[U-Boot-Users] Any default audio card driver in U-boot?

[boku]

Dear all,
    I'm searching for some example for audio card driver for U-boot?
But it seems most drivers in drivers/ are for ethernet card. Can
anyone tell me where I can find it in u-boot? Thanks a lot!~

Regards,

[U-Boot-Users] Any default audio card driver in U-boot?

[Bryan Wu]

Could you tell us why do you want to use an audio card in a bootloader?

Thanks 

----- Original Message ----- 
From: "boku" <boku0712@gmail.com>
To: <u-boot-users@lists.sourceforge.net>
Sent: Monday, August 22, 2005 11:42 AM
Subject: [U-Boot-Users] Any default audio card driver in U-boot?


Dear all,
    I'm searching for some example for audio card driver for U-boot?
But it seems most drivers in drivers/ are for ethernet card. Can
anyone tell me where I can find it in u-boot? Thanks a lot!~

Regards,


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[U-Boot-Users] Any default audio card driver in U-boot?

[Wolfgang Denk]

In message <715d9090050821204265e86ab2@mail.gmail.com> you wrote:
>
>     I'm searching for some example for audio card driver for U-boot?

There are none. Remember, this is a boot loader, not an OS.


Best regards,

Wolfgang Denk

-- 
Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd at denx.de
"I've seen it. It's rubbish."          - Marvin the Paranoid Android

[U-Boot-Users] Any default audio card driver in U-boot?

[Martin Krause]

Hi,

u-boot-users-admin at lists.sourceforge.net wrote on Monday, August 22,
2005 5:42 AM: 
> Dear all,
>     I'm searching for some example for audio card driver for U-boot?
> But it seems most drivers in drivers/ are for ethernet card. Can
> anyone tell me where I can find it in u-boot? Thanks a lot!~

We implemented some _very_ basic sound commands (play a beep, play
square wave, play a microsoft .wav file) to test our hardware
with it. Perhaps you will find this usefull. Please look at:

http://source.denx.net/cgi-bin/gitweb.cgi?p=u-boot.git;a=commit;h=6617aae9b9f297c388fc011bdf4eb6c4553339e6

The commands are implemented in board/tqm5200/cmd_stk52xx.c

Regards,
Martin

TQ-Systems GmbH
M?hlstra?e 2, Gut Delling, 82229 Seefeld
Tel. +49 (8153) 93 08-157, Fax +49 (8153) 93 08-7157
martin.krause at tqs.de
www.tq-group.com

[U-Boot-Users] Any default audio card driver in U-boot?

[boku]

Ok! It's just what i want. Thank you very much!~

B.R. 

On 8/22/05, Martin Krause <Martin.Krause@tqs.de> wrote:
> Hi,
> 
> u-boot-users-admin at lists.sourceforge.net wrote on Monday, August 22,
> 2005 5:42 AM:
> > Dear all,
> >     I'm searching for some example for audio card driver for U-boot?
> > But it seems most drivers in drivers/ are for ethernet card. Can
> > anyone tell me where I can find it in u-boot? Thanks a lot!~
> 
> We implemented some _very_ basic sound commands (play a beep, play
> square wave, play a microsoft .wav file) to test our hardware
> with it. Perhaps you will find this usefull. Please look at:
> 
> http://source.denx.net/cgi-bin/gitweb.cgi?p=u-boot.git;a=commit;h=6617aae9b9f297c388fc011bdf4eb6c4553339e6
> 
> The commands are implemented in board/tqm5200/cmd_stk52xx.c
> 
> Regards,
> Martin
> 
> TQ-Systems GmbH
> M?hlstra?e 2, Gut Delling, 82229 Seefeld
> Tel. +49 (8153) 93 08-157, Fax +49 (8153) 93 08-7157
> martin.krause at tqs.de
> www.tq-group.com
>

[U-Boot-Users] Any default audio card driver in U-boot?

[Martin Krause]

Hi Boku,

boku wrote on Wednesday, November 16, 2005 8:26 AM:
> Dear Martin,
>     Thanks for the information to me. I'd like to ask you further
> about your audio driver. Did you design the driver based on ALSA
> architecture? Or you directly write your driver without it? I met some
> problems while using alsa to build my audio driver for a specific arm
> soc chip. Thanks in advance.

No, we didn't base on ALSA. We only needed a quick hack to test
our audio hardware. For linux audio driver the usage of DMA is a must,
to feed the audio codec continuously with data (any interruption in
the audio stream would be hearable).
Since U-Boot is single-tasking, instead of DMA transfers, a polling
mechanism could be used to feed the audio codec continously with data.
This is much easier to implement - and is the way we did it.

Regards, Martin

> On 8/22/05, Martin Krause <Martin.Krause@tqs.de> wrote:
> > Hi,
> > 
> > u-boot-users-admin at lists.sourceforge.net wrote on Monday, August 22,
> > 2005 5:42 AM:
> > > Dear all,
> > >     I'm searching for some example for audio card driver for
> > > U-boot? But it seems most drivers in drivers/ are for ethernet
> > > card. Can anyone tell me where I can find it in u-boot? Thanks a
> > > lot!~ 
> > 
> > We implemented some _very_ basic sound commands (play a beep, play
> > square wave, play a microsoft .wav file) to test our hardware
> > with it. Perhaps you will find this usefull. Please look at:
> > 
> > http://source.denx.net/cgi-bin/gitweb.cgi?p=u-boot.git;a=commit;h=6617aae9b9f297c388fc011bdf4eb6c4553339e6
> > 
> > The commands are implemented in board/tqm5200/cmd_stk52xx.c