[U-Boot] ads5121 - remove PSC serial console support - U-Boot - denx.biz

newer
[U-Boot] [PATCH v2 0/4] mpc52xx:...

[U-Boot] ads5121 - remove PSC serial console support

older
[U-Boot] FPGA relocation/C...

Angelo

30 Oct 2009 30 Oct '09

9:16 p.m.

Hi all,

I'm working on freescale ev. board ads5121ev and I'm trying to remove serial console support.

Do you know the right procedure to remove it?

Thanks in advance.

Reply

Show replies by date

Wolfgang Denk

30 Oct 30 Oct

10:23 p.m.

Dear Angelo,

In message 630811.21371.qm@web23106.mail.ird.yahoo.com you wrote:

I'm working on freescale ev. board ads5121ev and I'm trying to remove serial console support.

Which sense would this make?

Do you know the right procedure to remove it?

The right procedure is to keep it! U-Boot is designed around the principle of having a serial console avaialable as early as possible. You don't give up this lightly.

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de Harrison's Postulate: For every action, there is an equal and opposite criticism.

Reply

Angelo

31 Oct 31 Oct

2:43 a.m.

Ok,

I'm trying to reduce boot time and i don't want to omit anything!

I know that console is fundamental, but i need to disable it. After some modifies it seems like u-boot execute an infinite loop, waiting for unknown something.

Are there some special file (e.g. cpu/mpc512x/serial.c, include/configs/ads5121.h ...) that I have to modify?

I suppose that should be a way to remove it completely.

Thanks

--- Ven 30/10/09, Wolfgang Denk wd@denx.de ha scritto:

Da: Wolfgang Denk wd@denx.de Oggetto: Re: [U-Boot] ads5121 - remove PSC serial console support A: "Angelo" s104259@yahoo.it Cc: u-boot@lists.denx.de Data: Venerdì 30 ottobre 2009, 22:23

Dear Angelo,

In message 630811.21371.qm@web23106.mail.ird.yahoo.com you wrote:

I'm working on freescale ev. board ads5121ev and I'm trying to remove serial console support.

Which sense would this make?

Do you know the right procedure to remove it?

The right procedure is to keep it! U-Boot is designed around the principle of having a serial console avaialable as early as possible. You don't give up this lightly.

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de Harrison's Postulate: For every action, there is an equal and opposite criticism.

Reply

Wolfgang Denk

3:39 p.m.

Dear Angelo,

In message 523536.75919.qm@web23108.mail.ird.yahoo.com you wrote:

I'm trying to reduce boot time and i don't want to omit anything!

Hm.. did you do any profiling and are you really sure that the initial console messages really contribute a significant amount to the boot time?

On the MPC5121ADS board, U-Boot prints some 340 characters before you can turn off the conssole using the usual methods. At 115200 bps this takes about 30 milliseconds.

Are you really sure that it makes sense to optimize on thislevel yet? Have you solved / accelerated all the other slow parts yet?

I know that console is fundamental, but i need to disable it. After some modifies it seems like u-boot execute an infinite loop, waiting for unknown something.

Attach a debugger. It should be trivial to see where U-Boot is spinning.

I suppose that should be a way to remove it completely.

I am pretty sure that what you are trying to do makes little sense.

--- Ven 30/10/09, Wolfgang Denk wd@denx.de ha scritto:

Da: Wolfgang Denk wd@denx.de

Please also make sure to read http://www.netmeister.org/news/learn2quote.html

Do not top post / full quote. Thanks.

Best regards,

Wolfgang Denk

-- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: wd@denx.de The ideal situation is to have massive computing power right at home. Something that dims the streetlights and shrinks the picture on the neighbours' TVs when you boot it up.

Reply

5667

Age (days ago)

5668

Last active (days ago)

Download

3 comments

2 participants

tags (0)

participants (2)

Angelo
Wolfgang Denk