[coreboot] XMM stack

[Rudolf Marek]

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Hi all

During the weekend train trips I managed to get serialICE 1.2 working with the
XMM stack (in qemu).

There were some gotchas:

#1 missing SSE enable
#2 missing stack setup ;) (taken from RemoteBIOS)
#3 wrong LD script, the rodata section relocation did not work
#4 the stack realign feature
#5 missing -O2 ;)

I'm attaching the modified files right now. Not so big deal hopefully.

Please can someone fix the ld script in proper way? I borrowed this change from
the RemoteBIOS.

Btw now it has just 17KB and not nearly 60KB or so with romcc ;)

With that we have 128B of stack.

Thanks,

Rudolf


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