I worked around that error with the hack below.

```
$ git diff
diff --git a/src/arch/x86/Makefile.inc b/src/arch/x86/Makefile.inc
index 1615e75c9a..d818205ab7 100644
--- a/src/arch/x86/Makefile.inc
+++ b/src/arch/x86/Makefile.inc
@@ -78,11 +78,7 @@ $(1)-S-ccopts += -I.
 $$(objcbfs)/$(1).debug: $$$$($(1)-libs) $$$$($(1)-objs)
        @printf "    LINK       $$(subst $$(obj)/,,$$(@))\n"
        $$(LD_$(1)) $$(LDFLAGS_$(1)) -o $$@ -L$$(obj) $$(COMPILER_RT_FLAGS_$(1)) -Wl,--whole-archive,--start-group $$(filter-out %.ld,$$($(1)-objs)) $$($(1)-libs) -Wl,--no-whole-archive $$(COMPILER_RT_$(1)) -Wl,--end-group -T $(call src-to-obj,$(1),$(dir)/memlayout.ld) -Wl,--oformat=$(2)
-       -LANG=C LC_ALL= $$(OBJCOPY_$(1)) --only-section .illegal_globals $$(@) $$(objcbfs)/$(1)_null.offenders >/dev/null 2>&1
-       if [ -z "$$$$($$(NM_$(1)) $$(objcbfs)/$(1)_null.offenders 2>&1 | grep 'no symbols')" ];then \
-               echo "Forbidden global variables in $(1):"; \
-               $$(NM_$(1)) $$(objcbfs)/$(1)_null.offenders; false; \
-       fi
+       -LANG=C LC_ALL= $$(OBJCOPY_$(1)) --only-section $$(@) $$(objcbfs)/$(1)_null.offenders >/dev/null 2>&1
 endef
 
 ###############################################################################
diff --git a/src/arch/x86/car.ld b/src/arch/x86/car.ld
index 92b26a0877..05e317dd29 100644
--- a/src/arch/x86/car.ld
+++ b/src/arch/x86/car.ld
@@ -83,10 +83,6 @@
  */
 
 . = 0xffffff00;
-.illegal_globals . : {
-       *(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data)
-               *(EXCLUDE_FILE ("*/libagesa.*.a:" "*/romstage*/buildOpts.o" "*/romstage*/agesawrapper.o" "*/vendorcode/amd/agesa/*" "*/vendorcode/amd/cimx/*") .data.*)
-}
 
 _bogus = ASSERT((CONFIG_DCACHE_RAM_SIZE == 0) || (SIZEOF(.car.data) <= CONFIG_DCACHE_RAM_SIZE), "Cache as RAM area is too full");
 #if CONFIG(PAGING_IN_CACHE_AS_RAM)
```

romstage is 9.3 % smaller, and ramstage around 11 %.

```
$ build/cbfstool build/coreboot.rom print
FMAP REGION: COREBOOT
Name Offset Type Size Comp
cbfs master header 0x0 cbfs header 32 none
fallback/romstage 0x80 stage 170260 none
fallback/ramstage 0x29a00 stage 105668 none
[…]
```

No LTO:

```
fallback/romstage 0x80 stage 185012 none
fallback/ramstage 0x2d3c0 stage 119027 none
```

With that, I reach the payload phase, but the drive connected to the SATA port is not detected by the payload (GRUB, SeaBIOS) and GNU/Linux (5.7-rc1 and 5.5) – also not with warm reboot. I cannot spot a difference in the coreboot log [1]. Booting from USB works.

[1]: https://paste.flashrom.org/view.php?id=3306

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