[U-Boot] RFC: Aligning arch initialisation sequences

[Wolfgang Denk]

Dear Graeme Russ,

In message <4CDF36E3.7060505 at gmail.com> you wrote:
>
> board_early_init_f() is (in most cases) the very first entry in the
> init_sequence[]

Right.

> So if global data is defined on the stack in board_init_f() and copied to
> the heap at the end of board_init_f() we should be OK. Is global data
> needed prior to board_init_f()?

Yes, as we have no writable data segmeit before relocation. We need a
way to pass around some data.

> For x86, I allocate global data in asm and set three members. The sticking
> point for me is the single ulong parameter to board_init_f() which does not
> present enough flexibility to pass all the information I need.

Pass a pointer to a struct ?

> One nit-pick is that, in reality, the stack space used by board_init_f() is
> never reclaimed because it never returns. What we could do is reset the
> stack pointer prior to calling board_init_r()

This is not correct. After relocation, we set up a completely new
stack in RAM.

Best regards,

Wolfgang Denk

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