[U-Boot] [ELDK] global variables

[Wolfgang Denk]

Dear Detlev Zundel,

In message <m2sjosp3w7.fsf at ohwell.denx.de> you wrote:
> 
> So currently as U-Boot is its own loader, we accept the fact that .bss
> will be cleared on relocation.  Actually I don't even know if it is
> correct at all to use .bss variables before then (if you look around,
> you'll find the "global_data" structure (include/asm/global-data.h) that
> we use in this early phase by keeping a reference to it in a register)

Accessing any data in BSS before relocation causes undefined
behaviour, because the BSS segment does not exist yet.

Best regards,

Wolfgang Denk

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