LinuxBoot is a firmware for modern servers that replaces specific firmware functionality with a Linux kernel and runtime. It can work with many different bootloaders such as coreboot, u-boot, UEFI and Slim Bootloader. This repo demonstrates how to enable LinuxBoot on Slim Bootloader with QEMU platform. The similar steps can be applied on ohter real hardware platforms supported by Slim Bootloader.
Prepare basic environment for u-root. Please refer to u-root for GO language development environment setup.
Prepare basic environment for Slim Bootloader. Please refer to Slim Bootloader for details.
Clone this repo and then run build command:
make all
Run LinuxBoot on QEMU:
make run
LinuxBoot log on QEMU:
qemu-system-x86_64 -cpu qemu64,+movbe -machine q35,max-fw-size=16777216 -m 256 -serial mon:stdio -bn
WARNING: Image format was not specified for 'sbl/Outputs/qemu/SlimBootloader.bin' and probing guess.
Automatically detecting the format is dangerous for raw images, write operations on block .
Specify the 'raw' format explicitly to remove the restrictions.
============= Intel Slim Bootloader STAGE1A =============
SBID: SB_QEMU
ISVN: 001
IVER: 000.005.001.001.00545
SVER: F7ADD2E46D5F9B4E
FDBG: BLD(D IA32) FSP(R)
FSPV: ID($QEMFSP$) REV(00001000)
Loader global data @ 0x00001D44
Run STAGE1A @ 0x00070000
Load STAGE1B @ 0x00040000
HASH verification for usage (0x00000001) with Hash Alg (0x2): Success
============= Intel Slim Bootloader STAGE1B =============
Host Bridge Device ID:0x29C0
Board ID:0x1 - Loading QEMU!
QEMU Flash: Attempting flash detection at FF000000
QemuFlashDetected => FD behaves as FLASH
QemuFlashDetected => Yes
SpiInstance = 0000E480
Variable region: 0xFF7A0000:0x2000
SPI WRITE: FF7A0010 00000004
SPI WRITE: FF7A0011 00000001
SPI WRITE: FF7A0014 00000008
SPI WRITE: FF7A001C 00000004
SPI WRITE: FF7A0011 00000001
Loading Component KEYH:_HS_
Registering container KEYH
HASH verification for usage (0x00000100) with Hash Alg (0x2): Success
SignType (0x2) SignSize (0x180) SignHashAlg (0x2)
RSA verification for usage (0x00000100): Success
HASH verification for usage (0x00000000) with Hash Alg (0x2): Success
Append public key hash into store: Success
Load EXT CFG Data @ 0x0000EB54:0x0170 ... Success
HASH verification for usage (0x00000200) with Hash Alg (0x2): Success
SignType (0x2) SignSize (0x180) SignHashAlg (0x2)
RSA verification for usage (0x00000200): Success
BOOT: BP0
MODE: 0
BoardID: 0x01
PlatformName: QEMU_01
Memory Init
Found Config TAG: 0x180 @ 0x0000ECE4
MemCfg.Test1=11223344, MemCfg.Test2=11223346
Found Config TAG: 0x200 @ 0x0000ECF4
SilCfg.Test1=11223347, SilCfg.Test2=04030201
Call FspMemoryInit ... Success
Loader global data @ 0x0EEBFD70
Load page table from memory @ 0x0DF74000
Remapping Stage to 0x0DF77000
FSP Resource HOB Range Type Owner
================================= ==== ====================================
0000000000000000-00000000000A0000 00 00000000-0000-0000-0000-000000000000
00000000000A0000-0000000000100000 05 00000000-0000-0000-0000-000000000000
0000000000100000-000000000EF00000 00 00000000-0000-0000-0000-000000000000
000000000EF00000-000000000F000000 05 69A79759-1373-4367-A6C4-C7F59EFD986E
000000000F000000-0000000010000000 05 D038747C-D00C-4980-B319-490199A47D55
Switch to memory stack @ 0x0EEFFF00
Stage1 stack: 0x2000 (0x1210 used)
Stage1 heap: 0xE000 (0x1F04 used)
Call FspTempRamExit ... Success
Memory FSP @ 0x0EF00000
Memory TOP @ 0x0DF74000
Loading Component FLMP:SG02
HASH verification for usage (0x00000002) with Hash Alg (0x2): Success
Loaded STAGE2 @ 0x0EE55000
============= Intel Slim Bootloader STAGE2 =============
Unmapping Stage
Board GPIO Init
Get base platform GPIO table from board ID 0
Programming 7 GPIO entries
GPIO GPP_A00 DATA: 0x00000000 0x00000010
GPIO GPP_A02 DATA: 0x80000002 0x00000012
GPIO GPP_A03 DATA: 0xC0000003 0x00000013
GPIO GPP_A04 DATA: 0x01000004 0x00000014
GPIO GPP_A05 DATA: 0x41000005 0x00000015
GPIO GPP_A06 DATA: 0x81000006 0x00000016
GPIO GPP_A07 DATA: 0xC1000007 0x00000017
Test variable services
SPI WRITE: FF7A0020 00000004
SPI WRITE: FF7A0021 00000001
SPI WRITE: FF7A0024 00000008
SPI WRITE: FF7A002C 00000004
SPI WRITE: FF7A0011 00000001
SPI WRITE: FF7A0021 00000001
SPI WRITE: FF7A0011 00000001
Loading Component IPFW:TST3
Registering container IPFW
HASH verification for usage (0x00001000) with Hash Alg (0x2): Success
SignType (0x2) SignSize (0x180) SignHashAlg (0x2)
RSA verification for usage (0x00001000): Success
HASH verification for usage (0x00000000) with Hash Alg (0x2): Success
SignType (0x2) SignSize (0x180) SignHashAlg (0x2)
RSA verification for usage (0x00000000): Success
Load IP firmware @ 0:0x0 - Bad Buffer Size
Silicon Init
Select VBT ImageId 0x00000001
Call FspSiliconInit ...
Success
Graphics Info: 800 x 600 x 32 @ 0x80000000
MEM: 0000000000000000 00000000000A0000 00 1
MEM: 00000000000A0000 0000000000060000 00 2
MEM: 0000000000100000 000000000DE00000 00 1
MEM: 000000000DF00000 0000000000004000 01 2
MEM: 000000000DF04000 0000000000068000 00 3
MEM: 000000000DF6C000 0000000000008000 00 4
MEM: 000000000DF74000 0000000000F8C000 00 2
MEM: 000000000EF00000 0000000000100000 00 2
MEM: 000000000F000000 0000000001000000 00 2
MEM: 00000000FF000000 0000000001000000 00 2
MP Init (Wakeup)
MP Init (Run)
Detected 1 CPU threads
CPU 0 APIC ID: 0
SMM rebase done on 1 CPUs
PCI Enum
Call FspNotifyPhase(20) ... Success
ACPI Init
Publish ACPI table: FACP
Publish ACPI table: HPET
Publish ACPI table: APIC
Publish ACPI table: MCFG
Publish ACPI table: FPDT
Publish ACPI table: BGRT
Publish ACPI table: TEST
ACPI Ret: Success
Enable SMRR
Loading Payload ID LINX
Loading Component EPLD:LINX
Registering container EPLD
HASH verification for usage (0x00001000) with Hash Alg (0x2): Success
SignType (0x2) SignSize (0x180) SignHashAlg (0x2)
RSA verification for usage (0x00001000): Success
HASH verification for usage (0x00000000) with Hash Alg (0x2): Success
Load Payload ID 0x584E494C @ 0x00800000
Found bzimage Signature
BzImage Format Payload
Loading Component EPLD:CMDL
HASH verification for usage (0x00000000) with Hash Alg (0x2): Success
Kernel command line:
console=ttyS0,115200n8
Loading Component EPLD:INRD
HASH verification for usage (0x00000000) with Hash Alg (0x2): Success
InitRD is loaded at 0xE9F7000:0x2FAEBC
Found bzimage Signature
MP Init (Done)
Call FspNotifyPhase(40) ... Success
Call FspNotifyPhase(F0) ... Success
HOB @ 0x0EEC0000
Created 4 OS boot options (Current: 16)
Stage2 stack: 0x40000 (stack used 0xB10, HOB used 0xFA0, 0x3E550 free)
Stage2 heap: 0xF4C000 (0x4C9000 used, 0xA83000 free)
Payload entry: 0x0EE59064
Jump to payload
Switch to LongMode and jump to 64-bit kernel entrypoint ...
Linux version 5.11.0 (mxma@mxma-ubuntu) (gcc (Ubuntu 9.3.0-23ubuntu1~16.04) 9.3.0, GNU ld (GNU Binu1
Command line: console=ttyS0,115200n8 acpi_rsdp=0xDF04000
x86/fpu: x87 FPU will use FXSAVE
BIOS-provided physical RAM map:
BIOS-e820: [mem 0x0000000000000000-0x000000000009ffff] usable
BIOS-e820: [mem 0x00000000000a0000-0x00000000000fffff] reserved
BIOS-e820: [mem 0x0000000000100000-0x000000000defffff] usable
BIOS-e820: [mem 0x000000000df00000-0x000000000df03fff] reserved
BIOS-e820: [mem 0x000000000df04000-0x000000000df6bfff] ACPI data
BIOS-e820: [mem 0x000000000df6c000-0x000000000df73fff] ACPI NVS
BIOS-e820: [mem 0x000000000df74000-0x000000000fffffff] reserved
BIOS-e820: [mem 0x00000000ff000000-0x00000000ffffffff] reserved
NX (Execute Disable) protection: active
SMBIOS 2.5 present.
DMI: Intel Corporation Unknown/Unknown, BIOS XXXX.XXX.XXX.XXX Unknown
tsc: Fast TSC calibration using PIT
tsc: Detected 3292.542 MHz processor
last_pfn = 0xdf00 max_arch_pfn = 0x400000000
x86/PAT: Configuration [0-7]: WB WT UC- UC WB WT UC- UC
RAMDISK: [mem 0x0e9f7000-0x0ecf1fff]
Allocated new RAMDISK: [mem 0x0dc05000-0x0deffebb]
Move RAMDISK from [mem 0x0e9f7000-0x0ecf1ebb] to [mem 0x0dc05000-0x0deffebb]
ACPI: Early table checksum verification disabled
ACPI: RSDP 0x000000000DF04000 000024 (v02 OEMID )
ACPI: XSDT 0x000000000DF040E0 00005C (v01 OEMID OEMTABLE 00000005 CREA 0100000D)
ACPI: FACP 0x000000000DF04210 00010C (v05 OEMID OEMTABLE 00000005 CREA 0100000D)
ACPI: DSDT 0x000000000DF044E0 001BD9 (v02 OEMID APL-SOC 00000000 INTL 20160422)
ACPI: FACS 0x000000000DF04320 000040
ACPI: FACS 0x000000000DF04320 000040
ACPI: HPET 0x000000000DF04360 000038 (v01 OEMID OEMTABLE 00000005 CREA 0100000D)
ACPI: APIC 0x000000000DF043A0 00005A (v03 00000000 00000000)
ACPI: MCFG 0x000000000DF04400 00003C (v01 00000001 00000000)
ACPI: FPDT 0x000000000DF04440 000044 (v01 INTEL OEMTABLE 00000005 CREA 0100000D)
ACPI: BGRT 0x000000000DF060C0 000038 (v01 OEMID OEMTABLE 00000005 CREA 0100000D)
ACPI: TEST 0x000000000DF06100 00002C (v01 OEMID OEMTABLE 00000001 CREA 01000001)
Zone ranges:
DMA32 [mem 0x0000000000001000-0x000000000defffff]
Normal empty
Movable zone start for each node
Early memory node ranges
node 0: [mem 0x0000000000001000-0x000000000009ffff]
node 0: [mem 0x0000000000100000-0x000000000defffff]
Zeroed struct page in unavailable ranges: 8545 pages
Initmem setup node 0 [mem 0x0000000000001000-0x000000000defffff]
ACPI: PM-Timer IO Port: 0x408
ACPI: LAPIC_NMI (acpi_id[0xff] high level lint[0x1])
IOAPIC[0]: apic_id 1, version 32, address 0xfec00000, GSI 0-23
ACPI: INT_SRC_OVR (bus 0 bus_irq 0 global_irq 2 dfl dfl)
ACPI: INT_SRC_OVR (bus 0 bus_irq 9 global_irq 9 low level)
Using ACPI (MADT) for SMP configuration information
ACPI: HPET id: 0x0 base: 0xfed00000
smpboot: Allowing 1 CPUs, 0 hotplug CPUs
[mem 0x10000000-0xfeffffff] available for PCI devices
clocksource: refined-jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 764551960021156s
setup_percpu: NR_CPUS:64 nr_cpumask_bits:64 nr_cpu_ids:1 nr_node_ids:1
percpu: Embedded 39 pages/cpu s129368 r0 d30376 u2097152
Built 1 zonelists, mobility grouping on. Total pages: 56119
Kernel command line: console=ttyS0,115200n8 acpi_rsdp=0xDF04000
Dentry cache hash table entries: 32768 (order: 6, 262144 bytes, linear)
Inode-cache hash table entries: 16384 (order: 5, 131072 bytes, linear)
mem auto-init: stack:off, heap alloc:off, heap free:off
Memory: 207292K/227964K available (6146K kernel code, 730K rwdata, 720K rodata, 764K init, 540K bss)
rcu: Hierarchical RCU implementation.
rcu: RCU restricting CPUs from NR_CPUS=64 to nr_cpu_ids=1.
rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
rcu: Adjusting geometry for rcu_fanout_leaf=16, nr_cpu_ids=1
NR_IRQS: 4352, nr_irqs: 256, preallocated irqs: 16
Console: colour dummy device 80x25
printk: console [ttyS0] enabled
ACPI: Core revision 20201113
clocksource: hpet: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604467 ns
APIC: Switch to symmetric I/O mode setup
..TIMER: vector=0x30 apic1=0 pin1=2 apic2=-1 pin2=-1
clocksource: tsc-early: mask: 0xffffffffffffffff max_cycles: 0x2f75c6d054c, max_idle_ns: 4407952564s
Calibrating delay loop (skipped), value calculated using timer frequency.. 6585.08 BogoMIPS (lpj=13)
pid_max: default: 4096 minimum: 301
Mount-cache hash table entries: 512 (order: 0, 4096 bytes, linear)
Mountpoint-cache hash table entries: 512 (order: 0, 4096 bytes, linear)
Last level iTLB entries: 4KB 0, 2MB 0, 4MB 0
Last level dTLB entries: 4KB 0, 2MB 0, 4MB 0, 1GB 0
Spectre V1 : Mitigation: usercopy/swapgs barriers and __user pointer sanitization
Spectre V2 : Mitigation: Full AMD retpoline
Spectre V2 : Spectre v2 / SpectreRSB mitigation: Filling RSB on context switch
Speculative Store Bypass: Vulnerable
Freeing SMP alternatives memory: 8K
smpboot: CPU0: AMD QEMU Virtual CPU version 2.5+ (family: 0x6, model: 0x6, stepping: 0x3)
Performance Events: PMU not available due to virtualization, using software events only.
rcu: Hierarchical SRCU implementation.
smp: Bringing up secondary CPUs ...
smp: Brought up 1 node, 1 CPU
smpboot: Max logical packages: 1
smpboot: Total of 1 processors activated (6585.08 BogoMIPS)
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
futex hash table entries: 16 (order: -2, 1024 bytes, linear)
thermal_sys: Registered thermal governor 'step_wise'
thermal_sys: Registered thermal governor 'user_space'
cpuidle: using governor ladder
ACPI: bus type PCI registered
PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-0xefffffff] (base 0xe0000000)
PCI: not using MMCONFIG
PCI: Using configuration type 1 for base access
ACPI: Added _OSI(Module Device)
ACPI: Added _OSI(Processor Device)
ACPI: Added _OSI(3.0 _SCP Extensions)
ACPI: Added _OSI(Processor Aggregator Device)
ACPI: Added _OSI(Linux-Dell-Video)
ACPI: Added _OSI(Linux-Lenovo-NV-HDMI-Audio)
ACPI: Added _OSI(Linux-HPI-Hybrid-Graphics)
ACPI: 1 ACPI AML tables successfully acquired and loaded
ACPI: Interpreter enabled
ACPI: (supports S0 S5)
ACPI: Using IOAPIC for interrupt routing
PCI: MMCONFIG for domain 0000 [bus 00-ff] at [mem 0xe0000000-0xefffffff] (base 0xe0000000)
PCI: MMCONFIG at [mem 0xe0000000-0xefffffff] reserved in ACPI motherboard resources
PCI: Using host bridge windows from ACPI; if necessary, use "pci=nocrs" and report a bug
ACPI: PCI Root Bridge [PCI0] (domain 0000 [bus 00-ff])
acpi PNP0A03:00: _OSC: OS supports [ExtendedConfig ASPM ClockPM Segments MSI HPX-Type3]
PCI host bridge to bus 0000:00
pci_bus 0000:00: root bus resource [io 0x0000-0x0cf7 window]
pci_bus 0000:00: root bus resource [io 0x0d00-0xffff window]
pci_bus 0000:00: root bus resource [mem 0x000a0000-0x000bffff window]
pci_bus 0000:00: root bus resource [mem 0x80000000-0xdfffffff window]
pci_bus 0000:00: root bus resource [mem 0x800000000-0xfffffffff window]
pci_bus 0000:00: root bus resource [bus 00-ff]
pci 0000:00:00.0: [8086:29c0] type 00 class 0x060000
pci 0000:00:01.0: [1234:1111] type 00 class 0x030000
pci 0000:00:01.0: reg 0x10: [mem 0x81000000-0x81ffffff pref]
pci 0000:00:01.0: reg 0x18: [mem 0x80045000-0x80045fff]
pci 0000:00:01.0: reg 0x30: [mem 0x00000000-0x0000ffff pref]
pci 0000:00:01.0: BAR 0: assigned to efifb
pci 0000:00:02.0: [8086:10d3] type 00 class 0x020000
pci 0000:00:02.0: reg 0x10: [mem 0x80020000-0x8003ffff]
pci 0000:00:02.0: reg 0x14: [mem 0x80000000-0x8001ffff]
pci 0000:00:02.0: reg 0x18: [io 0x2060-0x207f]
pci 0000:00:02.0: reg 0x1c: [mem 0x80040000-0x80043fff]
pci 0000:00:02.0: reg 0x30: [mem 0x00000000-0x0003ffff pref]
pci 0000:00:1f.0: [8086:2918] type 00 class 0x060100
pci 0000:00:1f.0: quirk: [io 0x0400-0x047f] claimed by ICH6 ACPI/GPIO/TCO
pci 0000:00:1f.2: [8086:2922] type 00 class 0x010601
pci 0000:00:1f.2: reg 0x20: [io 0x2040-0x205f]
pci 0000:00:1f.2: reg 0x24: [mem 0x80044000-0x80044fff]
pci 0000:00:1f.3: [8086:2930] type 00 class 0x0c0500
pci 0000:00:1f.3: reg 0x20: [io 0x2000-0x203f]
ACPI: PCI Interrupt Link [LNKS] (IRQs *9)
ACPI: PCI Interrupt Link [LNKA] (IRQs 5 10 11) *0
ACPI: PCI Interrupt Link [LNKB] (IRQs 5 10 11) *0
ACPI: PCI Interrupt Link [LNKC] (IRQs 5 10 11) *0
ACPI: PCI Interrupt Link [LNKD] (IRQs 5 10 11) *0
SCSI subsystem initialized
ACPI: bus type USB registered
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
PCI: Using ACPI for IRQ routing
hpet: 3 channels of 0 reserved for per-cpu timers
clocksource: Switched to clocksource tsc-early
ACPI: Failed to create genetlink family for ACPI event
pnp: PnP ACPI init
system 00:00: [mem 0xe0000000-0xefffffff] has been reserved
system 00:00: [mem 0xfed1c000-0xfed1cfff] has been reserved
system 00:00: [mem 0xfee00000-0xfeefffff] has been reserved
system 00:02: [io 0x01e0-0x01ef] has been reserved
system 00:02: [io 0x0160-0x016f] has been reserved
system 00:02: [io 0x0278-0x027f] has been reserved
system 00:02: [io 0x0370-0x0371] has been reserved
system 00:02: [io 0x0378-0x037f] has been reserved
system 00:02: [io 0x0678-0x067f] has been reserved
system 00:02: [io 0x0778-0x077f] has been reserved
system 00:02: [io 0x0800] has been reserved
system 00:02: [io 0xafe0-0xafe3] has been reserved
system 00:02: [io 0xb000-0xb03f] has been reserved
pnp: PnP ACPI: found 9 devices
clocksource: acpi_pm: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 2085701024 ns
pci 0000:00:02.0: BAR 6: assigned [mem 0x80080000-0x800bffff pref]
pci 0000:00:01.0: BAR 6: assigned [mem 0x80050000-0x8005ffff pref]
pci_bus 0000:00: resource 4 [io 0x0000-0x0cf7 window]
pci_bus 0000:00: resource 5 [io 0x0d00-0xffff window]
pci_bus 0000:00: resource 6 [mem 0x000a0000-0x000bffff window]
pci_bus 0000:00: resource 7 [mem 0x80000000-0xdfffffff window]
pci_bus 0000:00: resource 8 [mem 0x800000000-0xfffffffff window]
pci 0000:00:01.0: Video device with shadowed ROM at [mem 0x000c0000-0x000dffff]
PCI: CLS 0 bytes, default 64
Trying to unpack rootfs image as initramfs...
Freeing initrd memory: 3052K
workingset: timestamp_bits=62 max_order=16 bucket_order=0
io scheduler mq-deadline registered
io scheduler kyber registered
efifb: probing for efifb
efifb: framebuffer at 0x81000000, using 1876k, total 1875k
efifb: mode is 800x600x32, linelength=3200, pages=1
efifb: scrolling: redraw
efifb: Truecolor: size=8:8:8:8, shift=24:16:8:0
Console: switching to colour frame buffer device 100x37
fb0: EFI VGA frame buffer device
Serial: 8250/16550 driver, 4 ports, IRQ sharing disabled
00:05: ttyS0 at I/O 0x3f8 (irq = 4, base_baud = 115200) is a 16550A
brd: module loaded
loop: module loaded
ahci 0000:00:1f.2: AHCI 0001.0000 32 slots 6 ports 1.5 Gbps 0x3f impl SATA mode
ahci 0000:00:1f.2: flags: 64bit ncq only
scsi host0: ahci
scsi host1: ahci
scsi host2: ahci
scsi host3: ahci
scsi host4: ahci
scsi host5: ahci
ata1: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044100 irq 24
ata2: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044180 irq 24
ata3: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044200 irq 24
ata4: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044280 irq 24
ata5: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044300 irq 24
ata6: SATA max UDMA/133 abar m4096@0x80044000 port 0x80044380 irq 24
usbcore: registered new interface driver usb-storage
sdhci: Secure Digital Host Controller Interface driver
sdhci: Copyright(c) Pierre Ossman
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
IPI shorthand broadcast: enabled
random: get_random_bytes called from 0xffffffff81030652 with crng_init=0
sched_clock: Marking stable (2149545776, 31733617)->(2184090657, -2811264)
ata2: SATA link down (SStatus 0 SControl 300)
ata1: SATA link down (SStatus 0 SControl 300)
ata3: SATA link up 1.5 Gbps (SStatus 113 SControl 300)
ata3.00: ATAPI: QEMU DVD-ROM, 2.5+, max UDMA/100
ata3.00: applying bridge limits
ata3.00: configured for UDMA/100
ata6: SATA link down (SStatus 0 SControl 300)
ata5: SATA link down (SStatus 0 SControl 300)
ata4: SATA link down (SStatus 0 SControl 300)
scsi 2:0:0:0: CD-ROM QEMU QEMU DVD-ROM 2.5+ PQ: 0 ANSI: 5
Freeing unused kernel image (initmem) memory: 764K
Write protecting the kernel read-only data: 10240k
Freeing unused kernel image (text/rodata gap) memory: 2044K
Freeing unused kernel image (rodata/data gap) memory: 1328K
Run /init as init process
tsc: Refined TSC clocksource calibration: 3292.521 MHz
clocksource: tsc: mask: 0xffffffffffffffff max_cycles: 0x2f75b3911c3, max_idle_ns: 440795347484 ns
clocksource: Switched to clocksource tsc
2021/05/26 01:17:06 Welcome to u-root!
_
_ _ _ __ ___ ___ | |_
| | | |____| '__/ _ \ / _ \| __|
| |_| |____| | | (_) | (_) | |_
\__,_| |_| \___/ \___/ \__|
init: 2021/05/26 01:17:06 no modules found matching '/lib/modules/*.ko'
~/# root@mini