tested with qemu:
===
qemu-system-x86_64 -bios build/coreboot.rom -serial stdio
coreboot-4.12-635-g322cab4277 Wed Jun 10 16:55:02 UTC 2020 bootblock starting (log level: 7)...
FMAP: Found "FLASH" version 1.1 at 0x0.
FMAP: base = 0xfffc0000 size = 0x40000 #areas = 3
FMAP: area COREBOOT found @ 200 (261632 bytes)
CBFS: Locating 'fallback/romstage'
CBFS: Found @ offset 80 size 3954
BS: bootblock times (exec / console): total (unknown) / 0 ms
coreboot-4.12-635-g322cab4277 Wed Jun 10 16:55:02 UTC 2020 romstage starting (log level: 7)...
QEMU: firmware config interface detected
Firmware config version id: 3
CBMEM:
IMD: root @ 0x07fff000 254 entries.
IMD: root @ 0x07ffec00 62 entries.
MTRR Range: Start=fffc0000 End=0 (Size 40000)
FMAP: area COREBOOT found @ 200 (261632 bytes)
CBFS: Locating 'fallback/postcar'
CBFS: Found @ offset 11340 size 3e30
Decompressing stage fallback/postcar @ 0x07fd3fc0 (32432 bytes)
Loading module at 0x07fd4000 with entry 0x07fd4000. filesize: 0x3b90 memsize: 0x7e70
Processing 145 relocs. Offset value of 0x05fd4000
BS: romstage times (exec / console): total (unknown) / 16 ms
coreboot-4.12-635-g322cab4277 Wed Jun 10 16:55:02 UTC 2020 postcar starting (log level: 7)...
FMAP: area COREBOOT found @ 200 (261632 bytes)
CBFS: Locating 'fallback/ramstage'
CBFS: Found @ offset 3a40 size c209
Decompressing stage fallback/ramstage @ 0x07faefc0 (144912 bytes)
Loading module at 0x07faf000 with entry 0x07faf000. filesize: 0x18858 memsize: 0x235d0
Processing 1516 relocs. Offset value of 0x071af000
BS: postcar times (exec / console): total (unknown) / 11 ms
coreboot-4.12-635-g322cab4277 Wed Jun 10 16:55:02 UTC 2020 ramstage starting (log level: 7)...
Enumerating buses...
Root Device scanning...
CPU_CLUSTER: 0 enabled
DOMAIN: 0000 enabled
CPU_CLUSTER: 0 scanning...
QEMU: firmware config interface detected
Firmware config version id: 3
QEMU: max_cpus is 1
CPU: APIC: 00 enabled
scan_bus: bus CPU_CLUSTER: 0 finished in 3 msecs
DOMAIN: 0000 scanning...
PCI: pci_scan_bus for bus 00
PCI: 00:00.0 [8086/1237] enabled
PCI: 00:01.0 [8086/7000] enabled
PCI: 00:01.1 [8086/7010] enabled
PCI: 00:01.3 [8086/7113] enabled
PCI: 00:02.0 [1234/1111] enabled
PCI: 00:03.0 [8086/100e] enabled
PCI: 00:01.0 scanning...
scan_bus: bus PCI: 00:01.0 finished in 0 msecs
PCI: 00:01.3 scanning...
scan_bus: bus PCI: 00:01.3 finished in 0 msecs
scan_bus: bus DOMAIN: 0000 finished in 10 msecs
scan_bus: bus Root Device finished in 19 msecs
done
BS: BS_DEV_ENUMERATE run times (exec / console): 7 / 16 ms
found VGA at PCI: 00:02.0
Setting up VGA for PCI: 00:02.0
Setting PCI_BRIDGE_CTL_VGA for bridge DOMAIN: 0000
Setting PCI_BRIDGE_CTL_VGA for bridge Root Device
Allocating resources...
Reading resources...
QEMU: e820/ram: 0x00000000 + 0x08000000
QEMU: reserve ioports 0x0510-0x0511 [firmware-config]
QEMU: reserve ioports 0x5658-0x5658 [vmware-port]
QEMU: reserve ioports 0xae00-0xae0f [pci-hotplug]
QEMU: reserve ioports 0xaf00-0xaf1f [cpu-hotplug]
QEMU: reserve ioports 0xafe0-0xafe3 [piix4-gpe0]
Done reading resources.
==== Resource allocator: DOMAIN: 0000 - Pass 1 (gathering requirements) ===
=== Resource allocator: DOMAIN: 0000 - Pass 2 (allocating resources) ===
DOMAIN: 0000 io: base: 0 size: 0 align: 0 gran: 0 limit: ffff
update_constraints: DOMAIN: 0000 0c base 00000510 limit 00000511 io (fixed)
update_constraints: DOMAIN: 0000 0d base 00005658 limit 00005658 io (fixed)
update_constraints: DOMAIN: 0000 0e base 0000ae00 limit 0000ae0f io (fixed)
update_constraints: DOMAIN: 0000 0f base 0000af00 limit 0000af1f io (fixed)
update_constraints: DOMAIN: 0000 10 base 0000afe0 limit 0000afe3 io (fixed)
update_constraints: PCI: 00:01.0 01 base 00000000 limit 00000fff io (fixed)
update_constraints: PCI: 00:01.3 01 base 0000e400 limit 0000e43f io (fixed)
update_constraints: PCI: 00:01.3 02 base 00000f00 limit 00000f0f io (fixed)
DOMAIN: 0000: Resource ranges:
* Base: 1000, Size: 4658, Tag: 100
* Base: 5659, Size: 57a7, Tag: 100
* Base: ae10, Size: f0, Tag: 100
* Base: af20, Size: c0, Tag: 100
* Base: afe4, Size: 341c, Tag: 100
* Base: e440, Size: 1bc0, Tag: 100
PCI: 00:03.0 14 * [0x1000 - 0x103f] limit: 103f io
PCI: 00:01.1 20 * [0x1040 - 0x104f] limit: 104f io
DOMAIN: 0000 io: base: 0 size: 0 align: 0 gran: 0 limit: ffff done
DOMAIN: 0000 mem: base: 0 size: 0 align: 0 gran: 0 limit: ffffffffff
update_constraints: DOMAIN: 0000 0a base 00000000 limit 0009ffff mem (fixed)
update_constraints: DOMAIN: 0000 0b base 000c0000 limit 07ffffff mem (fixed)
update_constraints: DOMAIN: 0000 11 base 000a0000 limit 000bffff mem (fixed)
update_constraints: DOMAIN: 0000 12 base 000c0000 limit 000fffff mem (fixed)
update_constraints: DOMAIN: 0000 02 base fec00000 limit fecfffff mem (fixed)
update_constraints: DOMAIN: 0000 03 base fee00000 limit fee0ffff mem (fixed)
update_constraints: PCI: 00:01.0 02 base ff800000 limit ffffffff mem (fixed)
DOMAIN: 0000: Resource ranges:
* Base: 8000000, Size: f6c00000, Tag: 200
* Base: fed00000, Size: 100000, Tag: 200
* Base: fee10000, Size: 9f0000, Tag: 200
* Base: 100000000, Size: ff00000000, Tag: 100200
PCI: 00:02.0 10 * [0x8000000 - 0x8ffffff] limit: 8ffffff prefmem
PCI: 00:03.0 30 * [0x9000000 - 0x903ffff] limit: 903ffff mem
PCI: 00:03.0 10 * [0x9040000 - 0x905ffff] limit: 905ffff mem
PCI: 00:02.0 30 * [0x9060000 - 0x906ffff] limit: 906ffff mem
PCI: 00:02.0 18 * [0x9070000 - 0x9070fff] limit: 9070fff mem
DOMAIN: 0000 mem: base: 0 size: 0 align: 0 gran: 0 limit: ffffffffff done
=== Resource allocator: DOMAIN: 0000 - resource allocation complete ===
PCI: 00:01.1 20 <- [0x0000001040 - 0x000000104f] size 0x00000010 gran 0x04 io
PCI: 00:02.0 10 <- [0x0008000000 - 0x0008ffffff] size 0x01000000 gran 0x18 prefmem
PCI: 00:02.0 18 <- [0x0009070000 - 0x0009070fff] size 0x00001000 gran 0x0c mem
PCI: 00:02.0 30 <- [0x0009060000 - 0x000906ffff] size 0x00010000 gran 0x10 romem
PCI: 00:03.0 10 <- [0x0009040000 - 0x000905ffff] size 0x00020000 gran 0x11 mem
PCI: 00:03.0 14 <- [0x0000001000 - 0x000000103f] size 0x00000040 gran 0x06 io
PCI: 00:03.0 30 <- [0x0009000000 - 0x000903ffff] size 0x00040000 gran 0x12 romem
Done setting resources.
Done allocating resources.
BS: BS_DEV_RESOURCES run times (exec / console): 15 / 73 ms
Enabling resources...
PCI: 00:00.0 cmd <- 00
PCI: 00:01.0 cmd <- 00
PCI: 00:01.1 cmd <- 01
PCI: 00:01.3 cmd <- 00
PCI: 00:02.0 cmd <- 03
PCI: 00:03.0 cmd <- 03
done.
BS: BS_DEV_ENABLE run times (exec / console): 4 / 3 ms
Initializing devices...
CPU_CLUSTER: 0 init
Initializing CPU #0
CPU: vendor AMD device 663
CPU: family 06, model 06, stepping 03
Setting up local APIC...
apic_id: 0x00 done.
CPU #0 initialized
CPU_CLUSTER: 0 init finished in 4 msecs
PCI: 00:00.0 init
Assigning IRQ 10 to PCI: 00:01.3
Assigning IRQ 11 to PCI: 00:03.0
PCI: 00:00.0 init finished in 6 msecs
PCI: 00:01.0 init
RTC Init
PCI: 00:01.0 init finished in 2 msecs
PCI: 00:01.1 init
IDE: Primary IDE interface: on
IDE: Secondary IDE interface: on
IDE: Access to legacy IDE ports: off
PCI: 00:01.1 init finished in 2 msecs
PCI: 00:02.0 init
PCI: 00:02.0 init finished in 15 msecs
PCI: 00:03.0 init
PCI: 00:03.0 init finished in 0 msecs
Devices initialized
BS: BS_DEV_INIT run times (exec / console): 25 / 15 ms
Finalize devices...
Devices finalized
BS: BS_POST_DEVICE run times (exec / console): 1 / 285 ms
Copying Interrupt Routing Table to 0x000f0000... done.
Copying Interrupt Routing Table to 0x07fa5000... done.
PIRQ table: 128 bytes.
QEMU: found ACPI tables in fw_cfg.
QEMU: loading "etc/acpi/rsdp" to 0x7f81000 (len 20)
QEMU: loading "etc/acpi/tables" to 0x7f81040 (len 131072)
QEMU: loaded ACPI tables from fw_cfg.
Looking on 0x07f81000 for valid checksum
Checksum 1 passed
Checksum 2 passed all OK
ACPI: * SSDT
Found 1 CPU(s).
ACPI: added table 4/32, length now 52
ACPI tables: 131136 bytes.
smbios_write_tables: 07f80000
SMBIOS: Unknown CPU
DOMAIN: 0000 (QEMU Northbridge i440fx)
QEMU: found smbios tables in fw_cfg (len 321).
QEMU: coreboot type0 table found at 0x7f80020.
QEMU: loading smbios tables to 0x7f80064
SMBIOS tables: 421 bytes.
Writing table forward entry at 0x00000500
Wrote coreboot table at: 0x00000500, 0x10 bytes, checksum 97e4
Writing coreboot table at 0x07fa6000
0. 0000000000000000-0000000000000fff: CONFIGURATION TABLES
1. 0000000000001000-000000000009ffff: RAM
2. 00000000000a0000-00000000000fffff: RESERVED
3. 0000000000100000-0000000007f7ffff: RAM
4. 0000000007f80000-0000000007faefff: CONFIGURATION TABLES
5. 0000000007faf000-0000000007fd2fff: RAMSTAGE
6. 0000000007fd3000-0000000007ffffff: CONFIGURATION TABLES
7. 00000000ff800000-00000000ffffffff: RESERVED
FMAP: area COREBOOT found @ 200 (261632 bytes)
Wrote coreboot table at: 0x07fa6000, 0x2a0 bytes, checksum 6e39
coreboot table: 696 bytes.
IMD ROOT 0. 0x07fff000 0x00001000
IMD SMALL 1. 0x07ffe000 0x00001000
CONSOLE 2. 0x07fde000 0x00020000
TIME STAMP 3. 0x07fdd000 0x00000910
ROMSTG STCK 4. 0x07fdc000 0x00001000
AFTER CAR 5. 0x07fd3000 0x00009000
RAMSTAGE 6. 0x07fae000 0x00025000
COREBOOT 7. 0x07fa6000 0x00008000
IRQ TABLE 8. 0x07fa5000 0x00001000
ACPI 9. 0x07f81000 0x00024000
SMBIOS 10. 0x07f80000 0x00000800
IMD small region:
IMD ROOT 0. 0x07ffec00 0x00000400
FMAP 1. 0x07ffeb40 0x000000b6
BS: BS_WRITE_TABLES run times (exec / console): 33 / 42 ms
FMAP: area COREBOOT found @ 200 (261632 bytes)
CBFS: Locating 'fallback/payload'
CBFS: Found @ offset 151c0 size 10eec
Checking segment from ROM address 0xfffd53f8
Payload being loaded at below 1MiB without region being marked as RAM usable.
Checking segment from ROM address 0xfffd5414
Loading segment from ROM address 0xfffd53f8
code (compression=1)
New segment dstaddr 0x000dfce0 memsize 0x20320 srcaddr 0xfffd5430 filesize 0x10eb4
Loading Segment: addr: 0x000dfce0 memsz: 0x0000000000020320 filesz: 0x0000000000010eb4
using LZMA
Loading segment from ROM address 0xfffd5414
Entry Point 0x000fd25f
BS: BS_PAYLOAD_LOAD run times (exec / console): 108 / 13 ms
Jumping to boot code at 0x000fd25f(0x07fa6000)
SeaBIOS (version rel-1.13.0-0-gf21b5a4)
BUILD: gcc: (coreboot toolchain v866e9e5cf7 2020-05-14) 10.1.0 binutils: (GNU Binutils) 2.34
SeaBIOS (version rel-1.13.0-0-gf21b5a4)
BUILD: gcc: (coreboot toolchain v866e9e5cf7 2020-05-14) 10.1.0 binutils: (GNU Binutils) 2.34
Found coreboot cbmem console @ 7fde000
Found mainboard Emulation QEMU x86 i440fx/piix4
Relocating init from 0x000e1400 to 0x07f32d00 (size 53856)
Found CBFS header at 0xfffc0238
multiboot: eax=7fc73a0, ebx=7fc7364
Found 6 PCI devices (max PCI bus is 00)
Copying SMBIOS entry point from 0x07f80000 to 0x000f6340
Copying ACPI RSDP from 0x07f81000 to 0x000f6320
Copying PIR from 0x07fa5000 to 0x000f62a0
Using pmtimer, ioport 0xe408
Scan for VGA option rom
Running option rom at c000:0003
pmm call arg1=0
Turning on vga text mode console
SeaBIOS (version rel-1.13.0-0-gf21b5a4)
ATA controller 1 at 1f0/3f4/0 (irq 14 dev 9)
ATA controller 2 at 170/374/0 (irq 15 dev 9)
Found 1 lpt ports
Found 1 serial ports
DVD/CD [ata1-0: QEMU DVD-ROM ATAPI-4 DVD/CD]
Searching bootorder for: /pci@i0cf8/*@1,1/drive@1/disk@0
Searching bios-geometry for: /pci@i0cf8/*@1,1/drive@1/disk@0
PS2 keyboard initialized
All threads complete.
Scan for option roms
Running option rom at ca00:0003
pmm call arg1=1
pmm call arg1=0
pmm call arg1=1
pmm call arg1=0
Searching bootorder for: /pci@i0cf8/*@3
Press ESC for boot menu.
Searching bootorder for: HALT
Space available for UMB: cb000-ed000, f5b60-f6200
Returned 262144 bytes of ZoneHigh
e820 map has 6 items:
0: 0000000000000000 - 000000000009fc00 = 1 RAM
1: 000000000009fc00 - 00000000000a0000 = 2 RESERVED
2: 00000000000f0000 - 0000000000100000 = 2 RESERVED
3: 0000000000100000 - 0000000007f80000 = 1 RAM
4: 0000000007f80000 - 0000000008000000 = 2 RESERVED
5: 00000000ff800000 - 0000000100000000 = 2 RESERVED
enter handle_19:
NULL
Booting from DVD/CD...
Device reports MEDIUM NOT PRESENT
scsi_is_ready returned -1
Boot failed: Could not read from CDROM (code 0003)
enter handle_18:
NULL
Booting from ROM...
Booting from ca00:0385
enter handle_18:
NULL
Booting from Floppy...
Boot failed: could not read the boot disk
enter handle_18:
NULL
Booting from Hard Disk...
Boot failed: could not read the boot disk
enter handle_18:
NULL
No bootable device. Retrying in 60 seconds.
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