On 16 Δεκ 2006, at 11:32 ΠΜ, Joakim Tjernlund wrote:
-----Original Message----- From: Jerry Van Baren [mailto:gerald.vanbaren@comcast.net] Sent: den 16 december 2006 17:08 To: Joakim Tjernlund Cc: u-boot-users@lists.sourceforge.net Subject: Re: [U-Boot-Users] builtin OF tree dtb gone
Joakim Tjernlund wrote:
While trying out the latest u-boot from my board I noticed that support for using a prebuilt OF tree compiled int u-boot is gone. The oftree_dtb symbol is gone and I can't find a replacement.
Why was it removed and is there a replacement?
If there isn't a replacement I request that one is added.
Jocke
I'm not the authority on this, but I believe the intent is that you compile the blob outside of u-boot and then you can load it into RAM via tftp or burn it into flash if you want it permanently on the board. Other than having to download and burn two things (u-boot and the dtb blob) rather than one, having it burn into flash separately is no different from compiling it into the u-boot image and is aesthetically much cleaner and more flexible.
"Other than having to download and burn two things" is a rather big deal to me. First it adds extra work actually get two images into the board. Secondly, now you have to reserve a DTB flash partion so you have somewhere to store it and that is a waste of space. Then you have to add even more args to the boot command to tell uboot where to find it.
To me this new OF seems like a nice feature for developing new stuff, but once you are done and ready to ship it only complicates things for boards that don't need this new flexibility.
Jocke
I agree.
As the guy that did the original implementation, my intent was to keep the DTB along with u-boot.
I don't know where you get the idea that it's more "flexible" or "cleaner" to have it on a different partition. That blob will never change after the board is debugged, so you've only introduced an extra complicated step to boot a kernel.
When I have enough free time (yeah right) I'll work on getting even the u-boot getting it's parameters from the blob - moving stuff away from the config.h file if possible.
Regards
Pantelis
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