PoC : qemu-coreboot-fbwhiptail-tpm1 & qemu-coreboot-whiptail-tpm1 wit…

…h native vga init + bootsplash

- Changes qemu call from -vga virtio to -vga std (to use bochs coreboot fb init)
- coreboot configs:
  - add CONFIG_FW_CONFIG=y to expose coreboot tables so fbsimple can fire up the console
  - add CONFIG_BOOTSPLASH_FILE="@BLOB_DIR@/bootsplash-1024x768.jpg" (hard to generate jpg, another story)
  - fixate CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_XRES=1024 and CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_YRES=768
- linux configs:
  - CONFIG_X86_SYSFB=y to have linux expect FB inititalized by firmware (EFI/BIOS: all the same requirement)
  - Removed DRM+GPU specific options # CONFIG_DRM is not set
  - add CONFIG_FB_SIMPLE=y so that linux uses coreboot's exposed FB
  - add CONFIG_FIRMWARE_EDID=y so that firmware is probed for config
  - add CONFIG_FB_MODE_HELPERS=y CONFIG_FB_TILEBLITTING=y so that fbwhiptail can deal with the framebuffer
  - add CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y CONFIG_FRAMEBUFFER_CONSOLE_DEFERRED_TAKEOVER=y to ease usage if whatever
- kexec patch : add "simple" fb support for VLFB, so that address of Heads fb is passed on kexec call

Limitations:
- BUGS:
 - qemu on debian-11 (not KVM) is not refreshing screen unless zooming in/out or chaning input (bug in qemu?)
 - FBWHIPTAIL requires VSYNC ioctl. Should not fail if not present to stay under fbwhiptail, not corrupting output.

boards/qemu-coreboot-fbwhiptail-tpm1/qemu-coreboot-fbwhiptail-tpm1.config

@@ -134,8 +134,7 @@ run: $(TPMDIR)/.manufacture $(ROOT_DISK_IMG) $(MEMORY_SIZE_FILE) $(USB_FD_IMG)
 		--machine q35,accel=kvm:tcg \
 		-rtc base=utc \
 		-smp "$$(nproc)" \
-		-vga virtio \
-		-full-screen \
+		-vga std \
 		-m "$$(cat "$(MEMORY_SIZE_FILE)")" \
 		-serial stdio \
 		--bios "$(QEMU_BOOT_ROM)" \

boards/qemu-coreboot-whiptail-tpm1/qemu-coreboot-whiptail-tpm1.config

@@ -134,8 +134,7 @@ run: $(TPMDIR)/.manufacture $(ROOT_DISK_IMG) $(MEMORY_SIZE_FILE) $(USB_FD_IMG)
 		--machine q35,accel=kvm:tcg \
 		-rtc base=utc \
 		-smp "$$(nproc)" \
-		-vga virtio \
-		-full-screen \
+		-vga std \
 		-m "$$(cat "$(MEMORY_SIZE_FILE)")" \
 		-serial stdio \
 		--bios "$(QEMU_BOOT_ROM)" \

config/coreboot-qemu-tpm1.config

@@ -35,8 +35,9 @@ CONFIG_NO_STAGE_CACHE=y
 # CONFIG_CBMEM_STAGE_CACHE is not set
 # CONFIG_UPDATE_IMAGE is not set
 CONFIG_BOOTSPLASH_IMAGE=y
-CONFIG_BOOTSPLASH_FILE="@BLOB_DIR@/bootsplash.jpg"
-# CONFIG_FW_CONFIG is not set
+CONFIG_BOOTSPLASH_FILE="@BLOB_DIR@/bootsplash-1024x768.jpg"
+CONFIG_FW_CONFIG=y
+# CONFIG_FW_CONFIG_SOURCE_CBFS is not set
 
 #
 # Software Bill Of Materials (SBOM)
@@ -355,8 +356,8 @@ CONFIG_HAVE_USBDEBUG_OPTIONS=y
 # CONFIG_USBDEBUG is not set
 # CONFIG_VPD is not set
 CONFIG_DRIVERS_EMULATION_QEMU_BOCHS=y
-CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_XRES=800
-CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_YRES=600
+CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_XRES=1024
+CONFIG_DRIVERS_EMULATION_QEMU_BOCHS_YRES=768
 # CONFIG_DRIVERS_GENERIC_CBFS_SERIAL is not set
 # CONFIG_DRIVERS_GENERIC_CBFS_UUID is not set
 # CONFIG_DRIVERS_GENESYSLOGIC_GL9750 is not set

config/coreboot-x230-maximized.config

@@ -656,7 +656,7 @@ CONFIG_HAVE_DEBUG_SMBUS=y
 # CONFIG_DEBUG_SMI is not set
 # CONFIG_DEBUG_MALLOC is not set
 # CONFIG_DEBUG_CONSOLE_INIT is not set
-# CONFIG_DEBUG_SPI_FLASH is not set
+CONFIG_DEBUG_SPI_FLASH=y
 # CONFIG_DEBUG_BOOT_STATE is not set
 # CONFIG_DEBUG_ADA_CODE is not set
 CONFIG_HAVE_EM100_SUPPORT=y