[coreboot] [PATCH]Avoid globals in romstage

[Patrick Georgi]

Hi,

attached patch makes globals in romstage a build breaking condition,
given that .bss and .data are allocated in ROM areas (ie. non-writable)
this is provides some protection against certain coding errors.


Signed-off-by: Patrick Georgi <patrick.georgi at coresystems.de>
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