[U-Boot-Users] Peripheral initialization hooks

[U-Boot-Users] Peripheral initialization hooks

[Steve Strublic]

Hello all,

 

I have a PPC852T platform running U-Boot.  My platform has the ability
to enable or disable the Ethernet PHY directly, and at boot the PHY is
disabled.  It must be enabled, through a register in an FPGA that is
accessed through a separate chip select.

 

Is it acceptable to modify board_init_r() to include a call to an
enable/disable function that would only apply if my board were defined?
Or are there any hooks for board-specific initializations?

 

Also, given that this is related to Ethernet, I think it's best that I
enable the PHY immediately before querying the config for 'ethaddr' in
board_init_r().  Agree/disagree?

 

TIA,

 

Steve

 

------

Steve Strublic

Network Solutions Group

Hypercom Corporation

Phoenix, AZ

 

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[U-Boot-Users] Peripheral initialization hooks

[Shawn Jin]

> Is it acceptable to modify board_init_r() to include a call to an
> enable/disable function that would only apply if my board were defined?  Or
> are there any hooks for board-specific initializations?

The hooks are already there. I would recommend board_early_init_f() or
board_early_init_r() which can be turned on/off by the board
configuration header file.

Regards,
-Shawn.

[U-Boot-Users] Peripheral initialization hooks

[Tolunay Orkun]

Steve,

Steve Strublic wrote:

 > I have a PPC852T platform running U-Boot.  My platform has the ability
 > to enable or disable the Ethernet PHY directly, and at boot the PHY is
 > disabled.  It must be enabled, through a register in an FPGA that is
 > accessed through a separate chip select.
 >
 >
 >
 > Is it acceptable to modify board_init_r() to include a call to an
 > enable/disable function that would only apply if my board were defined?
 > Or are there any hooks for board-specific initializations?
 >
 >
 >
 > Also, given that this is related to Ethernet, I think it?s best that I
 > enable the PHY immediately before querying the config for ?ethaddr? in
 > board_init_r().  Agree/disagree?

I personally would stay away modifying common code if there is a way to 
do it. You surely will make it modifications conditional for your board 
but still it is a distribution of your board programming logic into 
other files that are not obvious immediately.


What if you enable CONFIG_BOARD_EARLY_INIT_F in your board config file 
and create a board_early_init_f() that enables all your PHYs and leave 
it enabled?

Unless there is a serious issues with that, I would choose to keep all 
your PHYs enabled. This assumes that you have initialized your FPGA CS 
in your board initialization.

I use early init to initialize PLL to generate correct frquency for my 
external serial console clock and a number of other clocks.

Tolunay

[U-Boot-Users] Peripheral initialization hooks

[Wolfgang Denk]

In message <482F3C06ECF00C44AEC226520C6FCB1A51ECB9@EXCHANGEVS.HYPERCOM.COM> you wrote:
> 
> Is it acceptable to modify board_init_r() to include a call to an
> enable/disable function that would only apply if my board were defined?

No, it is not, as there are already too many such hooks available.

> Or are there any hooks for board-specific initializations?

Yes, there are.


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
Prepare for tomorrow -- get ready.
	-- Edith Keeler, "The City On the Edge of Forever",
	   stardate unknown

[U-Boot-Users] Peripheral initialization hooks

[Steve Strublic]

I have resolved the issue to my satisfaction by using the hooks.

Thanks,

Steve

-----Original Message-----
From: wd@denx.de [mailto:wd at denx.de] 
Sent: Thursday, February 16, 2006 5:08 PM
To: Steve Strublic
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Peripheral initialization hooks 

In message
<482F3C06ECF00C44AEC226520C6FCB1A51ECB9@EXCHANGEVS.HYPERCOM.COM> you
wrote:
> 
> Is it acceptable to modify board_init_r() to include a call to an
> enable/disable function that would only apply if my board were
defined?

No, it is not, as there are already too many such hooks available.

> Or are there any hooks for board-specific initializations?

Yes, there are.


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
Prepare for tomorrow -- get ready.
	-- Edith Keeler, "The City On the Edge of Forever",
	   stardate unknown

[U-Boot-Users] Peripheral initialization hooks

[Steve Strublic]

Thanks Shawn,

I think board_early_init_f() is a little too early to mess with the
Ethernet PHY.  However, I saw the hook for reset_phy() later on in
board_reset_r(), which is perfect.  So I hooked that for my board, and
voila!  

Steve

-----Original Message-----
From: Shawn Jin [mailto:shawnxjin at gmail.com] 
Sent: Monday, February 13, 2006 5:26 PM
To: Steve Strublic
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] Peripheral initialization hooks

> Is it acceptable to modify board_init_r() to include a call to an
> enable/disable function that would only apply if my board were
defined?  Or
> are there any hooks for board-specific initializations?

The hooks are already there. I would recommend board_early_init_f() or
board_early_init_r() which can be turned on/off by the board
configuration header file.

Regards,
-Shawn.