[U-Boot-Users] What the right procedure should be when write a new driver for U-boot?

[U-Boot-Users] What the right procedure should be when write a new driver for U-boot?

[Lyoo]

Hi maintainer

There is some confusion about what the right procedure should be, when
someone want to add some drivers to U-boot.

When I read U-boot's code, I found the devices initialize function
devices_init() (called in /u-boot-x.x.x/lib_xxx/board.c), It creates a
device list, then dev_xxx_init() register the devices such as LCD, USB,
Serial, Keyboard in the list. 

But, some SOC have their own drivers, for example s3c24x0 have their own
driver of USB, Serial,(/cpu/arm920t/s3c24x0/usb_ohci.c) they don't care
about the device list, they do it their way.

Is there any 'official' policy on it?

[U-Boot-Users] What the right procedure should be when write a new driver for U-boot?

[Lyoo]

Hi maintainer,

There is some confusion about what the right procedure should be, when
someone want to add some drivers to U-boot.

When I read U-boot's code, I found the devices initialize function
devices_init() (called in /u-boot-x.x.x/lib_xxx/board.c), It creates a
device list, then dev_xxx_init() register the devices such as LCD, USB,
Serial, Keyboard in the list.

But, some SOC have their own drivers, for example s3c24x0 have their own
driver of USB, Serial,(/cpu/arm920t/s3c24x0/usb_ohci.c) they don't care
about the device list, they do it their way.

Is there any 'official' policy on it?

-- 
Thanks & Regards
Lyoo

[U-Boot-Users] What the right procedure should be when write a new driver for U-boot?

[Wolfgang Denk]

In message <1158829226.8962.35.camel@localhost> you wrote:
> 
> When I read U-boot's code, I found the devices initialize function
> devices_init() (called in /u-boot-x.x.x/lib_xxx/board.c), It creates a
> device list, then dev_xxx_init() register the devices such as LCD, USB,
> Serial, Keyboard in the list. 

The "devices" list is  what  can  be  used  for  assignement  to  the
standard  I/O  "devices"  (i.  e.  the  stdin, stdout and stderr data
streams).

> But, some SOC have their own drivers, for example s3c24x0 have their own
> driver of USB, Serial,(/cpu/arm920t/s3c24x0/usb_ohci.c) they don't care
> about the device list, they do it their way.

Some devices like serial or LCD may be used for standard I/O streams,
others (like USB or network may not.

> Is there any 'official' policy on it?

Yes - see above.

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
"In matrimony, to hesitate is sometimes to be saved."        - Butler