[U-Boot-Users] Re: FT u-boot shim

Kumar Gala
2006-04-27T19:46:45Z

On Apr 27, 2006, at 2:40 PM, Wolfgang Denk wrote:

> In message
> <D358E665-60E4-48C0-82FD-7A1C16DAF00C@kernel.crashing.org> you wrote:
>>
>> The problem is that there are somethings that u-boot knows that needs
>> to go into the blob (memory size, boot args, initrd info,
>> frequencies, etc.)
>
> Yes. Can we append auch variable data to the fixed part of the dts?

appending is not really how it works, but the runtime fixup is doable.

>> How would we distinguish the bootm command that takes a blob versus
>> the ones we have today?
>
> Arg count. For example:
>
> OLD: bootm <kernel_addr>
> or bootm <kernel_addr> <ramdisk_addr>
>
> NEW: bootm <kernel_addr> - <dts_addr>
> or bootm <kernel_addr> <ramdisk_addr> <dts_addr>
>
>> As stated before, the main issue is doing some runtime fix ups to the
>> blob before its handed to the kernel.
>
> Let's do exactly this: runtime fix ups.
>
>> We could hand bootm a memory location with a blob and do the fix ups
>> at runtime, we would still have some coupling between the blob and u-
>> boot build. At least the blob wouldn't be built into u-boot.
>
> OK.

Let me play with this some now that I've got some direction.

- kumar