[U-Boot-Users] bootm support for netbsd question

[U-Boot-Users] bootm support for netbsd question

[Kumar Gala]

Anyone know why we pass the image_header_t * to the netbsd loader?

         /*
          * Booting a (NetBSD) kernel image
          *
          * This process is pretty similar to a standalone application:
          * The (first part of an multi-) image must be a stage-2  
loader,
          * which in turn is responsible for loading & invoking the  
actual
          * kernel.  The only differences are the parameters being  
passed:
          * besides the board info strucure, the loader expects a  
command
          * line, the name of the console device, and (optionally) the
          * address of the original image header.
          */
...

         /*
          * NetBSD Stage-2 Loader Parameters:
          *   r3: ptr to board info data
          *   r4: image address
          *   r5: console device
          *   r6: boot args string
          */
         (*loader) (gd->bd, os_hdr, consdev, cmdline);

this is some pretty tight coupling with u-boot.  Is the stage-2 loader  
part of u-boot?

- k

[U-Boot-Users] bootm support for netbsd question

[Rafal Jaworowski]

Kumar Gala wrote:
> Anyone know why we pass the image_header_t * to the netbsd loader?
> 

*snip*

> this is some pretty tight coupling with u-boot.  Is the stage-2 loader  
> part of u-boot?

I believe this is meant to be NetBSD's last stage bootloader and not any
U-Boot piece. See for example their PREP loader variant:
http://fxr.watson.org/fxr/source/arch/prep/stand/

As I understand it, to boot NetBSD from U-Boot they produce a fat image (the
above stage2 loader + kernel as a multi-image file), which is booted via
bootm, but I never exercised the procedure myself.

Rafal

[U-Boot-Users] bootm support for netbsd question

[Rafal Jaworowski]

Rafal Jaworowski wrote:
> Kumar Gala wrote:
>> Anyone know why we pass the image_header_t * to the netbsd loader?
>>
> 
> *snip*
> 
>> this is some pretty tight coupling with u-boot.  Is the stage-2 loader  
>> part of u-boot?
> 
> I believe this is meant to be NetBSD's last stage bootloader and not any
> U-Boot piece. See for example their PREP loader variant:
> http://fxr.watson.org/fxr/source/arch/prep/stand/

Ooops, I meant:
http://fxr.watson.org/fxr/source/arch/prep/stand/?v=NETBSD

Rafal