Static CBMEM / CAR: Flag boards with BROKEN_CAR_MIGRATE

Use of CAR_GLOBAL is not safe after CAR is torn down, unless the
board properly implements EARLY_CBMEM_INIT.

Flag vulnerable boards that only do cbmem_recovery() in romstage on S3
resume and implementation with Intel FSP that invalidates cache before
we have a chance to copy the contents.

Change-Id: Iecd10dee9b73ab3f1f66826950fa0945675ff39f
Signed-off-by: Kyösti Mälkki <kyosti.malkki@gmail.com>
Reviewed-on: http://review.coreboot.org/5419
Tested-by: build bot (Jenkins)
Reviewed-by: Aaron Durbin <adurbin@google.com>

src/arch/x86/boot/Makefile.inc

@@ -1,5 +1,5 @@
 romstage-$(CONFIG_EARLY_CBMEM_INIT) += cbmem.c
-romstage-$(CONFIG_HAVE_ACPI_RESUME) += cbmem.c
+romstage-$(CONFIG_BROKEN_CAR_MIGRATE) += cbmem.c
 
 ramstage-y += boot.c
 ramstage-y += gdt.c

src/arch/x86/boot/cbmem.c

@@ -49,13 +49,15 @@ void set_top_of_ram(uint64_t ramtop)
 	backup_top_of_ram(ramtop);
 	cbmem_late_set_table(ramtop - HIGH_MEMORY_SIZE, HIGH_MEMORY_SIZE);
 }
+#endif /* !__PRE_RAM__ */
 
+#if CONFIG_BROKEN_CAR_MIGRATE || !defined(__PRE_RAM__)
 unsigned long __attribute__((weak)) get_top_of_ram(void)
 {
 	printk(BIOS_WARNING, "WARNING: you need to define get_top_of_ram() for your chipset\n");
 	return 0;
 }
-#endif /* !__PRE_RAM__ */
+#endif
 
 #else