[Bug 1940400] Re: [SRU] Pi 4B 2GB boot failure
Dave Jones
1940400 at bugs.launchpad.net
Tue Nov 9 13:18:13 UTC 2021
** Changed in: linux-firmware-raspi2 (Ubuntu)
Status: Confirmed => Fix Released
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https://bugs.launchpad.net/bugs/1940400
Title:
[SRU] Pi 4B 2GB boot failure
Status in linux-firmware-raspi2 package in Ubuntu:
Fix Released
Status in linux-firmware-raspi2 source package in Bionic:
Fix Released
Bug description:
[ Impact ]
Boot failures are being observed with the current Bionic image in some
(but not all) Pi 4 2GB rev 1.4 boards (identified by revision code
b03114 in /proc/cpuinfo). The back-port is intended to rectify booting
on these machines. It is expected that most future 2GB boards in the
market are likely to be revision 1.4 as this is the latest revision of
the Pi 4 board.
[ Test Case ]
* Flash Ubuntu 18.04.5 preinstalled server arm64 image to an SD card
* Boot the card on a Raspberry Pi
- Please note that failure has only been observed (and only intermittently) on the Pi 4 2GB rev 1.4 boards
- These boards can be identified as having the Revision b03114 in /proc/cpuinfo
- On these boards, boot *may* fail during kernel startup with the current firmware. If it fails, boot the card on another Pi and ensure it completes successfully
- On all other boards, expect successful boot at this point
* Upgrade all packages: sudo apt update && sudo apt upgrade
* Enable proposed: https://wiki.ubuntu.com/Testing/EnableProposed
* Upgrade linux-firmware-raspi2 to -proposed version: sudo apt install -t bionic-proposed linux-firmware-raspi2
* Reboot and ensure boot completes successfully on all Pi models
- Please note that if you switched the SD card to successfully boot previously (due to boot failure on a 2GB rev 1.4 board), remember to switch the card back to the original Pi to re-test boot and verify it completes successfully
[ Regression Potential ]
As with anything updating with the boot sequence, boot failure is a
possibility. However, the boot firmware being back-ported is currently
in active use on focal and hirsute with no issues, and the purpose of
the back-port is to fix an existing observed boot failure in the new
generation of Pi 4 2GB boards (which are now becoming more prevalent
in the market).
[ Original Description ]
Some Pi 4B 2GBs fail to boot the current raspi bionic server image
(and core18). The kernel starts running but then just stops:
PM_RSTS: 0x00000020
RPi: BOOTLOADER release VERSION:c2f8c388 DATE: Apr 29 2021 TIME: 17:11:29 BOOTMODE: 0x00000006 part: 0 BUILD_TIMESTAMP=1619712685 0x70fc87a2 0x00b03114 0x000d1bfc
PM_RSTS: 0x00000020
part 00000000 reset_info 00000000
uSD voltage 3.3V
Initialising SDRAM 'Samsung' 16Gb x1 total-size: 16 Gbit 3200
PCI reset
PCI reset
VLI: HUB2: 0xfff00000 0x24e6 MCU: 0xfff20000 0x15218
XHCI-STOP
xHC ver: 256 HCS: 05000420 fc000031 00e70004 HCC: 002841eb
xHC ver: 256 HCS: 05000420 fc000031 00e70004 HCC: 002841eb
xHC ports 5 slots 32 intrs 4
Boot mode: SD (01) order 0
SD HOST: 250000000 CTL0: 0x00000000 BUS: 100000 Hz actual: 100000 HZ div: 2500 (1250) status: 0x1fff0000 delay: 1080
SD HOST: 250000000 CTL0: 0x00000f00 BUS: 100000 Hz actual: 100000 HZ div: 2500 (1250) status: 0x1fff0000 delay: 1080
OCR c0ff8000 [18]
CID: 000357445348333247801a9f373b013a
CSD: 400e0032db790000edc87f800a404000
SD: bus-width: 4 spec: 2 SCR: 0x02358483 0x00000000
SD HOST: 250000000 CTL0: 0x00000f04 BUS: 50000000 Hz actual: 41666666 HZ div: 6 (3) status: 0x1fff0000 delay: 2
MBR: 0x00000800, 524288 type: 0x0c
MBR: 0x00080800,61807583 type: 0x83
MBR: 0x00000000, 0 type: 0x00
MBR: 0x00000000, 0 type: 0x00
Trying partition: 0
lba: 2048 oem: 'mkfs.fat' volume: ' system-boot'
rsc 32 fat-sectors 4033 c-count 516190 c-size 1 r-dir 2 r-sec 0
PM_RSTS: 0x00000020
Trying partition: 0
lba: 2048 oem: 'mkfs.fat' volume: ' system-boot'
rsc 32 fat-sectors 4033 c-count 516190 c-size 1 r-dir 2 r-sec 0
Read config.txt bytes 1233 hnd 0x0002478c
gpio4 0=1
Read start4.elf bytes 2278432 hnd 0x0005facb
Read fixup4.dat bytes 5418 hnd 0x00054c4d
Firmware: 4439d2aaa6c376a2d1ef4402f142e1cf4de37c43 Sep 2 2020 21:13:13
0x00b03114 0x00000000 0x0000001f
MEM GPU: 76 ARM: 948 TOTAL: 1024
Starting start4.elf @ 0xfec00200 partition 0
PCI reset
+
U-Boot 2020.10+dfsg-1ubuntu0~20.04.2 (Jan 08 2021 - 13:03:11 +0000)
DRAM: 1.9 GiB
RPI 4 Model B (0xb03114)
MMC: mmcnr at 7e300000: 1, emmc2 at 7e340000: 0
Loading Environment from FAT... *** Warning - bad CRC, using default environment
In: serial
Out: vidconsole
Err: vidconsole
Net: eth0: ethernet at 7d580000
starting USB...
No working controllers found
Hit any key to stop autoboot: 0
switch to partitions #0, OK
mmc0 is current device
Scanning mmc 0:1...
Found U-Boot script /boot.scr
4660 bytes read in 33 ms (137.7 KiB/s)
## Executing script at 02400000
Failed to load '//uboot/ubuntu/boot.sel'
8393691 bytes read in 634 ms (12.6 MiB/s)
Total of 1 halfword(s) were the same
Decompressing kernel...
Uncompressed size: 23843328 = 0x16BD200
29957183 bytes read in 2190 ms (13 MiB/s)
Booting Ubuntu (with booti) from mmc 0:...
## Flattened Device Tree blob at 02600000
Booting using the fdt blob at 0x2600000
Using Device Tree in place at 0000000002600000, end 000000000260ee67
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd083]
[ 0.000000] Linux version 5.4.0-1034-raspi (buildd at bos02-arm64-050) (gcc version 9.3.0 (Ubuntu 9.3.0-17ubuntu1~20.04)) #37-Ubuntu SMP PREEMPT Mon Apr 12 23:14:49 UTC 2021 (Ubuntu 5.4.0-1034.37-raspi 5.4.101)
[ 0.000000] Machine model: Raspberry Pi 4 Model B Rev 1.4
[ 0.000000] earlycon: uart8250 at MMIO32 0x00000000fe215040 (options '')
[ 0.000000] printk: bootconsole [uart8250] enabled
[ 0.000000] efi: Getting EFI parameters from FDT:
[ 0.000000] efi: UEFI not found.
[ 0.000000] Reserved memory: created CMA memory pool at 0x000000002c000000, size 64 MiB
[ 0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[ 0.000000] On node 0 totalpages: 504832
[ 0.000000] DMA zone: 3792 pages used for memmap
[ 0.000000] DMA zone: 0 pages reserved
[ 0.000000] DMA zone: 242688 pages, LIFO batch:63
[ 0.000000] DMA32 zone: 4096 pages used for memmap
[ 0.000000] DMA32 zone: 262144 pages, LIFO batch:63
[ 0.000000] percpu: Embedded 32 pages/cpu s92120 r8192 d30760 u131072
[ 0.000000] pcpu-alloc: s92120 r8192 d30760 u131072 alloc=32*4096
[ 0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[ 0.000000] Detected PIPT I-cache on CPU0
[ 0.000000] CPU features: detected: EL2 vector hardening
[ 0.000000] CPU features: kernel page table isolation forced ON by KASLR
[ 0.000000] CPU features: detected: Kernel page table isolation (KPTI)
[ 0.000000] ARM_SMCCC_ARCH_WORKAROUND_1 missing from firmware
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 496944
[ 0.000000] Kernel command line: coherent_pool=1M 8250.nr_uarts=1 snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 bcm2708_fb.fbwidth=1824 bcm2708_fb.fbheight=984 bcm2708_fb.fbswap=1 smsc95xx.macaddr=E4:5F:01:49:37:9A vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 net.ifnames=0 dwc_otg.lpm_enable=0 root=LABEL=writable rootfstype=ext4 elevator=deadline rootwait fixrtc console=tty1 console=ttyS0,115200 loglevel=8 earlycon=uart8250,mmio32,0xfe215040
[ 0.000000] Dentry cache hash table entries: 262144 (order: 9, 2097152 bytes, linear)
[ 0.000000] Inode-cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
[ 0.000000] mem auto-init: stack:off, heap alloc:off, heap free:off
[ 0.000000] software IO TLB: mapped [mem 0x37400000-0x3b400000] (64MB)
[ 0.000000] Memory: 1793644K/2019328K available (11772K kernel code, 1268K rwdata, 4288K rodata, 4096K init, 1076K bss, 160148K reserved, 65536K cma-reserved)
[ 0.000000] random: get_random_u64 called from kmem_cache_open+0x3c/0x3e0 with crng_init=0
[ 0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[ 0.000000] ftrace: allocating 39069 entries in 153 pages
[ 0.000000] rcu: Preemptible hierarchical RCU implementation.
[ 0.000000] Tasks RCU enabled.
[ 0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[ 0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[ 0.000000] GIC: Using split EOI/Deactivate mode
[ 0.000000] arch_timer: cp15 timer(s) running at 54.00MHz (phys).
[ 0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0xc743ce346, max_idle_ns: 440795203123 ns
[ 0.000006] sched_clock: 56 bits at 54MHz, resolution 18ns, wraps every 4398046511102ns
[ 0.008337] Console: colour dummy device 80x25
[ 0.013363] printk: console [tty1] enabled
[ 0.017566] Calibrating delay loop (skipped), value calculated using timer frequency.. 108.00 BogoMIPS (lpj=216000)
[ 0.028153] pid_max: default: 32768 minimum: 301
[ 0.033052] LSM: Security Framework initializing
[ 0.037789] Yama: becoming mindful.
[ 0.041413] AppArmor: AppArmor initialized
[ 0.045774] Mount-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.053307] Mountpoint-cache hash table entries: 4096 (order: 3, 32768 bytes, linear)
[ 0.061314] *** VALIDATE tmpfs ***
[ 0.065446] *** VALIDATE proc ***
[ 0.069396] Disabling memory control group subsystem
[ 0.074507] *** VALIDATE cgroup1 ***
[ 0.078131] *** VALIDATE cgroup2 ***
[ 0.083066] ASID allocator initialised with 32768 entries
[ 0.088741] rcu: Hierarchical SRCU implementation.
[ 0.095776] EFI services will not be available.
[ 0.101311] smp: Bringing up secondary CPUs ...
[ 0.106937] Detected PIPT I-cache on CPU1
[ 0.106991] CPU1: Booted secondary processor 0x0000000001 [0x410fd083]
[ 0.108063] Detected PIPT I-cache on CPU2
[ 0.108102] CPU2: Booted secondary processor 0x0000000002 [0x410fd083]
[ 0.109152] Detected PIPT I-cache on CPU3
[ 0.109189] CPU3: Booted secondary processor 0x0000000003 [0x410fd083]
[ 0.109338] smp: Brought up 1 node, 4 CPUs
[ 0.145582] SMP: Total of 4 processors activated.
[ 0.150365] CPU features: detected: 32-bit EL0 Support
[ 0.155627] CPU features: detected: CRC32 instructions
[ 0.168524] CPU features: emulated: Privileged Access Never (PAN) using TTBR0_EL1 switching
[ 0.177003] CPU: All CPU(s) started at EL2
[ 0.181244] alternatives: patching kernel code
[ 0.187214] devtmpfs: initialized
[ 0.200656] Enabled cp15_barrier support
[ 0.204683] Enabled setend support
[ 0.208603] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 7645041785100000 ns
[ 0.218507] futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
[ 0.227797] pinctrl core: initialized pinctrl subsystem
[ 0.233762] DMI not present or invalid.
[ 0.238327] NET: Registered protocol family 16
[ 0.245375] DMA: preallocated 1024 KiB pool for atomic allocations
[ 0.251663] audit: initializing netlink subsys (disabled)
[ 0.257405] audit: type=2000 audit(0.192:1): state=initialized audit_enabled=0 res=1
[ 0.265320] cpuidle: using governor ladder
[ 0.269531] cpuidle: using governor menu
[ 0.274026] hw-breakpoint: found 6 breakpoint and 4 watchpoint registers.
[ 0.281220] Serial: AMBA PL011 UART driver
[ 0.288441] bcm2835-mbox fe00b880.mailbox: mailbox enabled
[ 0.306096] raspberrypi-firmware soc:firmware: Attached to firmware from 2020-09-02 21:13, variant start
[ 0.319748] raspberrypi-firmware soc:firmware: Firmware hash is 4439d2aaa6c376a2d1ef4402f142e1cf4de37c43
[ 0.372452] bcm2835-dma fe007000.dma: DMA legacy API manager, dmachans=0x1
[ 0.382547] iommu: Default domain type: Translated
[ 0.388770] SCSI subsystem initialized
[ 0.392820] libata version 3.00 loaded.
[ 0.396920] usbcore: registered new interface driver usbfs
[ 0.402542] usbcore: registered new interface driver hub
[ 0.407989] usbcore: registered new device driver usb
[ 0.413484] pps_core: LinuxPPS API ver. 1 registered
[ 0.418529] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti at linux.it>
[ 0.427801] PTP clock support registered
[ 0.432025] EDAC MC: Ver: 3.0.0
[ 0.436554] NetLabel: Initializing
[ 0.440035] NetLabel: domain hash size = 128
[ 0.444466] NetLabel: protocols = UNLABELED CIPSOv4 CALIPSO
[ 0.450277] NetLabel: unlabeled traffic allowed by default
[ 0.456854] clocksource: Switched to clocksource arch_sys_counter
[ 0.561061] *** VALIDATE bpf ***
[ 0.564679] VFS: Disk quotas dquot_6.6.0
[ 0.568770] VFS: Dquot-cache hash table entries: 512 (order 0, 4096 bytes)
[ 0.575877] *** VALIDATE ramfs ***
[ 0.579960] AppArmor: AppArmor Filesystem Enabled
[ 0.585188] simple-framebuffer 3e513000.framebuffer: framebuffer at 0x3e513000, 0x6d8c00 bytes, mapped to 0x(____ptrval____)
[ 0.596573] simple-framebuffer 3e513000.framebuffer: format=a8r8g8b8, mode=1824x984x32, linelength=7296
[ 0.616375] Console: switching to colour frame buffer device 228x61
[ 0.631942] simple-framebuffer 3e513000.framebuffer: fb0: simplefb registered!
[ 0.649421] thermal_sys: Registered thermal governor 'fair_share'
[ 0.649427] thermal_sys: Registered thermal governor 'bang_bang'
[ 0.655691] thermal_sys: Registered thermal governor 'step_wise'
[ 0.661840] thermal_sys: Registered thermal governor 'user_space'
[ 0.667988] thermal_sys: Registered thermal governor 'power_allocator'
[ 0.674734] NET: Registered protocol family 2
[ 0.686601] tcp_listen_portaddr_hash hash table entries: 1024 (order: 2, 16384 bytes, linear)
[ 0.695372] TCP established hash table entries: 16384 (order: 5, 131072 bytes, linear)
[ 0.703566] TCP bind hash table entries: 16384 (order: 6, 262144 bytes, linear)
[ 0.711265] TCP: Hash tables configured (established 16384 bind 16384)
[ 0.718150] UDP hash table entries: 1024 (order: 3, 32768 bytes, linear)
[ 0.725036] UDP-Lite hash table entries: 1024 (order: 3, 32768 bytes, linear)
[ 0.732570] NET: Registered protocol family 1
[ 0.737065] NET: Registered protocol family 44
[ 0.741625] PCI: CLS 0 bytes, default 64
[ 0.745903] Trying to unpack rootfs image as initramfs...
[ 1.437227] Freeing initrd memory: 29252K
[ 1.443047] hw perfevents: enabled with armv8_cortex_a72 PMU driver, 7 counters available
[ 1.451631] kvm [1]: IPA Size Limit: 44bits
[ 1.456850] kvm [1]: vgic interrupt IRQ1
[ 1.461127] kvm [1]: Hyp mode initialized successfully
[ 1.468625] Initialise system trusted keyrings
[ 1.473269] Key type blacklist registered
[ 1.477659] workingset: timestamp_bits=46 max_order=19 bucket_order=0
[ 1.491206] zbud: loaded
[ 1.495877] squashfs: version 4.0 (2009/01/31) Phillip Lougher
[ 1.502933] fuse: init (API version 7.31)
[ 1.507173] *** VALIDATE fuse ***
[ 1.510591] *** VALIDATE fuse ***
[ 1.537669] Key type asymmetric registered
[ 1.544140] Asymmetric key parser 'x509' registered
[ 1.551407] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 242)
[ 1.561406] io scheduler mq-deadline registered
[ 1.572749] brcm-pcie fd500000.pcie: host bridge /scb/pcie at 7d500000 ranges:
[ 1.582239] brcm-pcie fd500000.pcie: No bus range found for /scb/pcie at 7d500000, using [bus 00-ff]
[ 1.593864] brcm-pcie fd500000.pcie: MEM 0x0600000000..0x0603ffffff -> 0x00f8000000
[ 1.604513] brcm-pcie fd500000.pcie: IB MEM 0x0000000000..0x007fffffff -> 0x0000000000
[ 1.678948] brcm-pcie fd500000.pcie: link up, 5 GT/s x1 (SSC)
[ 1.687422] brcm-pcie fd500000.pcie: PCI host bridge to bus 0000:00
[ 1.696167] pci_bus 0000:00: root bus resource [bus 00-ff]
[ 1.704114] pci_bus 0000:00: root bus resource [mem 0x600000000-0x603ffffff] (bus address [0xf8000000-0xfbffffff])
[ 1.717081] pci 0000:00:00.0: [14e4:2711] type 01 class 0x060400
[ 1.725815] pci 0000:00:00.0: PME# supported from D0 D3hot
[ 1.737667] pci 0000:01:00.0: [1106:3483] type 00 class 0x0c0330
[ 1.746329] pci 0000:01:00.0: reg 0x10: [mem 0x00000000-0x00000fff 64bit]
[ 1.756041] pci 0000:01:00.0: PME# supported from D0 D3hot
[ 1.767833] pci 0000:00:00.0: BAR 14: assigned [mem 0x600000000-0x6000fffff]
[ 1.777441] pci 0000:01:00.0: BAR 0: assigned [mem 0x600000000-0x600000fff 64bit]
[ 1.787479] pci 0000:00:00.0: PCI bridge to [bus 01]
[ 1.794950] pci 0000:00:00.0: bridge window [mem 0x600000000-0x6000fffff]
[ 1.804713] pcieport 0000:00:00.0: enabling device (0000 -> 0002)
[ 1.813515] pcieport 0000:00:00.0: PME: Signaling with IRQ 41
[ 1.822107] pcieport 0000:00:00.0: AER: enabled with IRQ 41
[ 1.830373] pci 0000:01:00.0: enabling device (0000 -> 0002)
[ 1.883240] pci 0000:01:00.0: quirk_usb_early_handoff+0x0/0x658 took 51619 usecs
[ 1.893475] bcm2708_fb soc:fb: FB found 1 display(s)
[ 1.912150] bcm2708_fb soc:fb: Registered framebuffer for display 0, size 1824x984
[ 1.987512] Serial: 8250/16550 driver, 1 ports, IRQ sharing enabled
[ 1.998913] iproc-rng200 fe104000.rng: hwrng registered
[ 2.007084] vc-mem: phys_addr:0x00000000 mem_base=0x3ec00000 mem_size:0x40000000(1024 MiB)
[ 2.018792] gpiomem-bcm2835 fe200000.gpiomem: Initialised: Registers at 0xfe200000
[ 2.029314] cacheinfo: Unable to detect cache hierarchy for CPU 0
[ 2.410834] loop: module loaded
[ 2.419245] spi-bcm2835 fe204000.spi: could not get clk: -517
[ 2.429340] libphy: Fixed MDIO Bus: probed
[ 2.435959] tun: Universal TUN/TAP device driver, 1.6
[ 2.444128] bcmgenet fd580000.ethernet: failed to get enet clock
[ 2.452645] bcmgenet fd580000.ethernet: GENET 5.0 EPHY: 0x0000
[ 2.460941] bcmgenet fd580000.ethernet: failed to get enet-wol clock
[ 2.469784] bcmgenet fd580000.ethernet: failed to get enet-eee clock
[ 2.478613] bcmgenet: Skipping UMAC reset
[ 2.496893] libphy: bcmgenet MII bus: probed
[ 2.556953] unimac-mdio unimac-mdio.-19: Broadcom UniMAC MDIO bus
[ 2.566368] PPP generic driver version 2.4.2
[ 2.573308] usbcore: registered new interface driver lan78xx
[ 2.581479] usbcore: registered new interface driver smsc95xx
[ 2.589673] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 2.598656] ehci-pci: EHCI PCI platform driver
[ 2.605559] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 2.614196] ohci-pci: OHCI PCI platform driver
[ 2.621079] uhci_hcd: USB Universal Host Controller Interface driver
[ 2.630318] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 2.637986] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 1
[ 2.648416] xhci_hcd 0000:01:00.0: hcc params 0x002841eb hci version 0x100 quirks 0x0000009000000890
[ 2.661235] usb usb1: New USB device found, idVendor=1d6b, idProduct=0002, bcdDevice= 5.04
[ 2.672095] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.681887] usb usb1: Product: xHCI Host Controller
[ 2.689274] usb usb1: Manufacturer: Linux 5.4.0-1034-raspi xhci-hcd
[ 2.698063] usb usb1: SerialNumber: 0000:01:00.0
[ 2.705741] hub 1-0:1.0: USB hub found
[ 2.712034] hub 1-0:1.0: 1 port detected
[ 2.718985] xhci_hcd 0000:01:00.0: xHCI Host Controller
[ 2.726689] xhci_hcd 0000:01:00.0: new USB bus registered, assigned bus number 2
[ 2.736596] xhci_hcd 0000:01:00.0: Host supports USB 3.0 SuperSpeed
[ 2.745699] usb usb2: New USB device found, idVendor=1d6b, idProduct=0003, bcdDevice= 5.04
[ 2.756531] usb usb2: New USB device strings: Mfr=3, Product=2, SerialNumber=1
[ 2.766274] usb usb2: Product: xHCI Host Controller
[ 2.773597] usb usb2: Manufacturer: Linux 5.4.0-1034-raspi xhci-hcd
[ 2.782340] usb usb2: SerialNumber: 0000:01:00.0
[ 2.789947] hub 2-0:1.0: USB hub found
[ 2.796228] hub 2-0:1.0: 4 ports detected
[ 2.803658] dwc_otg: version 3.00a 10-AUG-2012 (platform bus)
[ 2.812127] dwc_otg: FIQ enabled
[ 2.817759] dwc_otg: NAK holdoff enabled
[ 2.824080] dwc_otg: FIQ split-transaction FSM enabled
[ 2.831635] Module dwc_common_port init
[ 2.838407] mousedev: PS/2 mouse device common for all mice
[ 2.846863] i2c /dev entries driver
[ 2.855789] bcm2835-wdt bcm2835-wdt: Broadcom BCM2835 watchdog timer
[ 2.864868] device-mapper: uevent: version 1.0.3
[ 2.872204] device-mapper: ioctl: 4.41.0-ioctl (2019-09-16) initialised: dm-devel at redhat.com
It seems there's something different about some Pi 4s since the same
image boots just fine on other Pi 4s. I found that updating the Pi
firmware to at least 1.20201022 'fixes' the boot problem of these
'special' Pis.
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