mb/google/kukui: Extend FMAP to 8MB layout

The SPI flash component requirement for Kukui family is 8M so we should
update FMAP for that:

- Add more comments for alignment and size recommendation.
- Enlarge RO to 4M, and RW_SECTION_{A,B} both ~1.5M.
- BOOTBLOCK: 32K->128K, aligned with other ARM boards.
- Preserve RW_DDR_TRAINING for new calibration.
- Reorder the sections for better alignment.
- RW_MISC to contain RW sections that should be merged when creating AU image.

BUG=b:134624821
TEST=Built Kukui image and boots. dump_fmap -h image-kukui.bin:
     # name              start       end         size
     RW_LEGACY           00700000    00800000    00100000
     RW_SHARED           006f7000    00700000    00009000
       RW_UNUSED           006f8000    00700000    00008000
       SHARED_DATA         006f7000    006f8000    00001000
     RW_SECTION_B        00580000    006f7000    00177000
       RW_FWID_B           006f6f00    006f7000    00000100
       FW_MAIN_B           00582000    006f6f00    00174f00
       VBLOCK_B            00580000    00582000    00002000
     RW_MISC             00577000    00580000    00009000
       RW_ELOG             0057f000    00580000    00001000
       RW_DDR_TRAINING     0057d000    0057f000    00002000
       RW_NVRAM            0057b000    0057d000    00002000
       RW_VPD              00577000    0057b000    00004000
     RW_SECTION_A        00400000    00577000    00177000
       RW_FWID_A           00576f00    00577000    00000100
       FW_MAIN_A           00402000    00576f00    00174f00
       VBLOCK_A            00400000    00402000    00002000
     WP_RO               00000000    00400000    00400000
       RO_VPD              003f8000    00400000    00008000
       RO_SECTION          00000000    003f8000    003f8000
         RO_FRID             003f7f00    003f8000    00000100
         GBB                 003f5000    003f7f00    00002f00
         COREBOOT            00021000    003f5000    003d4000
         FMAP                00020000    00021000    00001000
         BOOTBLOCK           00000000    00020000    00020000

Change-Id: Id342d57dc95c6197d05b8a265742a2866c35ae09
Signed-off-by: Hung-Te Lin <hungte@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/35612
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Julius Werner <jwerner@chromium.org>

src/mainboard/google/kukui/chromeos.fmd

@@ -1,30 +1,45 @@
-FLASH@0x0 0x800000 {
-	WP_RO@0x0 0x200000 {
-		RO_SECTION@0x0 0x1f8000 {
-			BOOTBLOCK@0 32K
-			FMAP@0x8000 0x1000
-			COREBOOT(CBFS)@0x9000 0x1ec000
+# Firmware Layout Description for Chrome OS.
+#
+# The size and address of every section must be aligned to at least 4K, except:
+# RO_FRID, RW_FWID*, GBB, or any unused / padding / CBFS type sections.
+#
+# 'FMAP' may be found by binary search so its starting address should be better
+# aligned to larger values.
+#
+# For sections to be preserved on update, add (PRESERVE) to individual sections
+# instead of a group section; otherwise the preserved data may be wrong if you
+# resize or reorder sections inside a group.
+
+FLASH@0x0 8M {
+	WP_RO@0x0 4M {
+		RO_SECTION {
+			BOOTBLOCK 128K
+			FMAP 4K
+			COREBOOT(CBFS)
 			GBB 0x2f00
 			RO_FRID 0x100
 		}
-		RO_VPD(PRESERVE)@0x1f8000 0x8000
+		RO_VPD(PRESERVE) 32K  # At least 16K.
 	}
-	RW_SECTION_A@0x200000 0x7c000 {
-		VBLOCK_A@0x0 0x2000
-		FW_MAIN_A(CBFS) 0x79f00
+	RW_SECTION_A 1500K {
+		VBLOCK_A 8K
+		FW_MAIN_A(CBFS)
 		RW_FWID_A 0x100
 	}
-	RW_SHARED@0x27c000 0x1000 {
-		SHARED_DATA@0x0 0x1000
+	RW_MISC 36K {
+		RW_VPD(PRESERVE) 16K  # At least 8K.
+		RW_NVRAM(PRESERVE) 8K
+		RW_DDR_TRAINING(PRESERVE) 8K
+		RW_ELOG(PRESERVE) 4K  # ELOG driver hard-coded size in 4K.
 	}
-	RW_NVRAM(PRESERVE)@0x27d000 0x2000
-	# ELOG driver has hard-coded the size to 4k.
-	RW_ELOG(PRESERVE)@0x27f000 0x1000
-	RW_SECTION_B@0x280000 0x7c000 {
-		VBLOCK_B@0x0 0x2000
-		FW_MAIN_B(CBFS) 0x79f00
+	RW_SECTION_B 1500K {
+		VBLOCK_B 8K
+		FW_MAIN_B(CBFS)
 		RW_FWID_B 0x100
 	}
-	RW_VPD(PRESERVE)@0x2fc000 0x4000
-	RW_LEGACY(CBFS)@0x300000 0x100000
+	RW_SHARED 36K {  # Will be force updated on recovery.
+		SHARED_DATA 4K  # 4K or less for netboot params.
+		RW_UNUSED
+	}
+	RW_LEGACY(CBFS) 1M  # Minimal 1M.
 }