Change in coreboot[master]: [WIP]Allow to build romstage sources inside the bootblock

[Keith Hui (Code Review)]

Attention is currently required from: Arthur Heymans, Martin Roth, ron minnich, Paul Menzel, Stefan Reinauer, Angel Pons, Patrick Rudolph, Ron Minnich, Felix Held.
Keith Hui has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/55068 )

Change subject: [WIP]Allow to build romstage sources inside the bootblock
......................................................................

Patch Set 4:

(1 comment)

Patchset:

PS4:
> You also need to build the current patch set, as the files where only added in patch set 2 [1].

That's it! I needed it as well. Done that. Building for asus/p2b-ls without payload yields this result:

Separate romstage
Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
fallback/romstage              0x80       stage           17408 none
cpu_microcode_blob.bin         0x4500     microcode       83968 none
fallback/ramstage              0x18d40    stage           52312 LZMA
build_info                     0x25a00    raw                98 none
fallback/dsdt.aml              0x25ac0    raw              5630 none
cmos_layout.bin                0x27100    cmos_layout       704 none
fallback/postcar               0x27400    stage           10400 none
(empty)                        0x29d00    null            79204 none
bootblock                      0x3d280    bootblock       11088 none

romstage folded into bootblock
Name                           Offset     Type           Size   Comp
cbfs master header             0x0        cbfs header        32 none
cpu_microcode_blob.bin         0x80       microcode       83968 none
fallback/ramstage              0x148c0    stage           52312 LZMA
build_info                     0x21580    raw                98 none
fallback/dsdt.aml              0x21640    raw              5630 none
cmos_layout.bin                0x22c80    cmos_layout       704 none
fallback/postcar               0x22f80    stage           10400 none
(empty)                        0x25880    null            88804 none
bootblock                      0x3b380    bootblock       19008 none

For a savings of 9600 bytes. Less than the 10-20k claimed, but still significant.

I look forward to further activities on the LTO front. Still I would have to leave out microcode to fit the Adaptec SCSI BIOS lifted from vendor firmware to boot from SCSI drives, or attempt to port aic78u2 to seabios (holy F!).

I still have to build it with seabios with a ps/2 init patch for boot testing - I do have issues with a real Model M on ps/2 port.