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Subject: Re: [RFC PATCH 0/2] of: unittest: add overlay gpio test to catch gpio
 hog problem
From:   Frank Rowand <frowand.list@gmail.com>
To:     Rob Herring <robh+dt@kernel.org>,
        Geert Uytterhoeven <geert+renesas@glider.be>,
        pantelis.antoniou@konsulko.com,
        Pantelis Antoniou <panto@antoniou-consulting.com>
Cc:     devicetree@vger.kernel.org, linux-kernel@vger.kernel.org,
        Alan Tull <atull@kernel.org>
References: <1579070828-18221-1-git-send-email-frowand.list@gmail.com>
 <578a2d41-e146-1f26-6bf4-30509ebe6941@gmail.com>
Message-ID: <58a264a9-c8a3-02fb-00bb-bd5332cd9e2a@gmail.com>
Date:   Wed, 15 Jan 2020 12:04:29 -0600
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On 1/15/20 11:28 AM, Frank Rowand wrote:
> On 1/15/20 12:47 AM, frowand.list@gmail.com wrote:
>> From: Frank Rowand <frank.rowand@sony.com>

< snip >

> I will reply to this email with examples of console boot message
> changes as a result of this patch series.
> 
> (1) boot before patches
> (2) boot after this patch series
> (3) messages from (2) processed by of_unittest_expect
> (4) messages from boot after Geert's patches on top of this patch
>     series processed by of_unittest_expect

< snip >

(3) messages from (2) processed by of_unittest_expect

Much easier to read than (2).  The first two columns contain
flags to point out lines that might be interesting.  This version
of of_unittest_expect has five spaces following the flag columns,
that will be fixed to be one space.

  EXPECT begin and EXPECT end lines are suppressed.
  Lines that match an EXPECT line are flagged with a leading 'ok'.
  Lines reporting a of_unittest_expect warning or error are flagged with a leading '**'.
  Lines reporting start or end of the unittests are flagged with a leading '->'.
  Lines reporting a unittest test FAIL are flagged with a leading '>>'.

The lines with a leading '**' are reporting that an expected message
was not found.  The messages do exist, but of_unittest_expect is not
yet smart enough to realize that '<<int>>' in the EXPECT messages are
meant to match an integer value.

The new unittest fail message to show the issue that Geert reported
is flagged with the leading '>>'.

The various messages triggered by unittest are flagged with 'ok'.

============================================================

       Android Bootloader - UART_DM Initialized!!!
       [0] welcome to lk
       
       [10] platform_init()
       [10] target_init()
       [10] Display Init: Start
       [10] display_init(),target_id=10.
       [30] Config MIPI_VIDEO_PANEL.
       [30] Turn on MIPI_VIDEO_PANEL.
       [50] Video lane tested successfully
       [50] Display Init: Done
       [80] Loading keystore failed status 5 [80] ERROR: scm_protect_keystore Failed[200] USB init ept @ 0xf96b000
       [220] fastboot_init()
       [220] udc_start()
       [340] -- reset --
       [350] -- portchange --
       [460] -- reset --
       [460] -- portchange --
       [650] fastboot: processing commands
       [760] fastboot: download:00f30000
       [1250] fastboot: boot
       [1270] Found Appeneded Flattened Device tree
       [1270] cmdline: console=ttyMSM0,115200,n8 androidboot.hardware=qcom maxcpus=2 msm_rtb.filter=0x37 ehci-hcd.park=3 norandmaps androidboot.emmc=true androidboot.serialno=40081c41 androidboot.baseband=apq
       [1290] Updating device tree: start
       [1300] Updating device tree: done
       [1300] booting linux @ 0x8000, ramdisk @ 0x2000000 (9533134), tags/device tree @ 0x1e00000
       [1310] Turn off MIPI_VIDEO_PANEL.
       [1310] Continuous splash enabled, keeping panel alive.
       Booting Linux on physical CPU 0x0
       Linux version 5.5.0-rc2-00002-gbc60035cbebc-dirty (frowand@xps8900) (gcc version 4.6.x-google 20120106 (prerelease) (GCC)) #26 SMP PREEMPT Wed Jan 15 11:12:23 CST 2020
       CPU: ARMv7 Processor [512f06f0] revision 0 (ARMv7), cr=10c5787d
       CPU: div instructions available: patching division code
       CPU: PIPT / VIPT nonaliasing data cache, PIPT instruction cache
       OF: fdt: Machine model: Qualcomm APQ8074 Dragonboard
       Memory policy: Data cache writealloc
       cma: Reserved 256 MiB at 0x70000000
       percpu: Embedded 19 pages/cpu s48192 r8192 d21440 u77824
       Built 1 zonelists, mobility grouping on.  Total pages: 490240
       Kernel command line: console=ttyMSM0,115200,n8 androidboot.hardware=qcom maxcpus=2 msm_rtb.filter=0x37 ehci-hcd.park=3 norandmaps androidboot.emmc=true androidboot.serialno=40081c41 androidboot.baseband=apq
       Dentry cache hash table entries: 131072 (order: 7, 524288 bytes, linear)
       Inode-cache hash table entries: 65536 (order: 6, 262144 bytes, linear)
       mem auto-init: stack:off, heap alloc:off, heap free:off
       Memory: 1664560K/1967104K available (8192K kernel code, 859K rwdata, 3804K rodata, 1024K init, 268K bss, 40400K reserved, 262144K cma-reserved, 1048576K highmem)
       SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
       rcu: Preemptible hierarchical RCU implementation.
       	Tasks RCU enabled.
       rcu: RCU calculated value of scheduler-enlistment delay is 10 jiffies.
       NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
       random: get_random_bytes called from start_kernel+0x2fc/0x508 with crng_init=0
       arch_timer: cp15 and mmio timer(s) running at 19.20MHz (virt/virt).
       clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
       sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
       Switching to timer-based delay loop, resolution 52ns
       Console: colour dummy device 80x30
       Calibrating delay loop (skipped), value calculated using timer frequency.. 38.40 BogoMIPS (lpj=192000)
       pid_max: default: 32768 minimum: 301
       Mount-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
       Mountpoint-cache hash table entries: 2048 (order: 1, 8192 bytes, linear)
       CPU: Testing write buffer coherency: ok
       CPU0: thread -1, cpu 0, socket 0, mpidr 80000000
       Setting up static identity map for 0x300000 - 0x300060
       rcu: Hierarchical SRCU implementation.
       smp: Bringing up secondary CPUs ...
       CPU1: thread -1, cpu 1, socket 0, mpidr 80000001
       smp: Brought up 1 node, 2 CPUs
       SMP: Total of 2 processors activated (76.80 BogoMIPS).
       CPU: All CPU(s) started in SVC mode.
       devtmpfs: initialized
       VFP support v0.3: implementor 51 architecture 64 part 6f variant 2 rev 0
       clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
       futex hash table entries: 1024 (order: 4, 65536 bytes, linear)
       pinctrl core: initialized pinctrl subsystem
       thermal_sys: Registered thermal governor 'step_wise'
       NET: Registered protocol family 16
       DMA: preallocated 256 KiB pool for atomic coherent allocations
       cpuidle: using governor menu
       hw-breakpoint: found 5 (+1 reserved) breakpoint and 4 watchpoint registers.
       hw-breakpoint: maximum watchpoint size is 8 bytes.
       iommu: Default domain type: Translated 
       vgaarb: loaded
       SCSI subsystem initialized
       usbcore: registered new interface driver usbfs
       usbcore: registered new interface driver hub
       usbcore: registered new device driver usb
       Advanced Linux Sound Architecture Driver Initialized.
       clocksource: Switched to clocksource arch_sys_counter
       NET: Registered protocol family 2
       tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 6144 bytes, linear)
       TCP established hash table entries: 8192 (order: 3, 32768 bytes, linear)
       TCP bind hash table entries: 8192 (order: 4, 65536 bytes, linear)
       TCP: Hash tables configured (established 8192 bind 8192)
       UDP hash table entries: 512 (order: 2, 16384 bytes, linear)
       UDP-Lite hash table entries: 512 (order: 2, 16384 bytes, linear)
       NET: Registered protocol family 1
       RPC: Registered named UNIX socket transport module.
       RPC: Registered udp transport module.
       RPC: Registered tcp transport module.
       RPC: Registered tcp NFSv4.1 backchannel transport module.
       PCI: CLS 0 bytes, default 64
       Trying to unpack rootfs image as initramfs...
       Freeing initrd memory: 9312K
       hw perfevents: enabled with armv7_krait PMU driver, 5 counters available
       Initialise system trusted keyrings
       workingset: timestamp_bits=30 max_order=19 bucket_order=0
       NFS: Registering the id_resolver key type
       Key type id_resolver registered
       Key type id_legacy registered
       Key type cifs.idmap registered
       jffs2: version 2.2. (NAND) © 2001-2006 Red Hat, Inc.
       fuse: init (API version 7.31)
       Key type asymmetric registered
       Asymmetric key parser 'x509' registered
       bounce: pool size: 64 pages
       Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
       io scheduler mq-deadline registered
       io scheduler kyber registered
       msm_serial f991e000.serial: msm_serial: detected port #0
       msm_serial f991e000.serial: uartclk = 7372800
       f991e000.serial: ttyMSM0 at MMIO 0xf991e000 (irq = 28, base_baud = 460800) is a MSM
       msm_serial: console setup on port #0
       printk: console [ttyMSM0] enabled
       msm_serial: driver initialized
       brd: module loaded
       loop: module loaded
       SCSI Media Changer driver v0.25 
       spmi spmi-0: PMIC arbiter version v1 (0x20000002)
       s1: supplied by regulator-dummy
       s2: supplied by regulator-dummy
       s3: supplied by regulator-dummy
       s4: Bringing 5100000uV into 5000000-5000000uV
       l1: supplied by regulator-dummy
       l2: supplied by regulator-dummy
       l3: supplied by regulator-dummy
       l4: supplied by regulator-dummy
       l5: supplied by regulator-dummy
       l6: supplied by regulator-dummy
       l7: supplied by regulator-dummy
       l8: supplied by regulator-dummy
       l9: supplied by regulator-dummy
       l10: supplied by regulator-dummy
       l11: supplied by regulator-dummy
       l12: supplied by regulator-dummy
       l13: supplied by regulator-dummy
       l14: supplied by regulator-dummy
       l15: supplied by regulator-dummy
       l16: supplied by regulator-dummy
       l17: supplied by regulator-dummy
       l18: supplied by regulator-dummy
       l19: supplied by regulator-dummy
       l20: supplied by regulator-dummy
       l21: supplied by regulator-dummy
       l22: supplied by regulator-dummy
       l23: supplied by regulator-dummy
       l24: supplied by regulator-dummy
       lvs1: supplied by regulator-dummy
       lvs2: supplied by regulator-dummy
       lvs3: supplied by regulator-dummy
       5vs1: supplied by s4
       5vs2: supplied by s4
       libphy: Fixed MDIO Bus: probed
       SLIP: version 0.8.4-NET3.019-NEWTTY (dynamic channels, max=256) (6 bit encapsulation enabled).
       CSLIP: code copyright 1989 Regents of the University of California.
       usbcore: registered new interface driver ax88179_178a
       usbcore: registered new interface driver cdc_ether
       usbcore: registered new interface driver net1080
       usbcore: registered new interface driver cdc_subset
       usbcore: registered new interface driver cdc_ncm
       ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
       ehci-pci: EHCI PCI platform driver
       usbcore: registered new interface driver cdc_acm
       cdc_acm: USB Abstract Control Model driver for USB modems and ISDN adapters
       rtc-pm8xxx fc4cf000.spmi:pm8941@0:rtc@6000: registered as rtc0
       i2c /dev entries driver
       qcom-smbb fc4cf000.spmi:pm8941@0:charger@1000: Initializing SMBB rev 3
       otg-vbus: supplied by 5vs1
       cpuidle: enable-method property 'qcom,kpss-acc-v2' found operations
       cpuidle: enable-method property 'qcom,kpss-acc-v2' found operations
       cpuidle: enable-method property 'qcom,kpss-acc-v2' found operations
       cpuidle: enable-method property 'qcom,kpss-acc-v2' found operations
       sdhci: Secure Digital Host Controller Interface driver
       sdhci: Copyright(c) Pierre Ossman
       sdhci-pltfm: SDHCI platform and OF driver helper
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       usbcore: registered new interface driver usbhid
       usbhid: USB HID core driver
       oprofile: using timer interrupt.
       NET: Registered protocol family 17
       Key type dns_resolver registered
       Registering SWP/SWPB emulation handler
       Loading compiled-in X.509 certificates
       debugfs: Directory 'fc4a9000.thermal-sensor' with parent 'tsens' already present!
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       s1: supplied by regulator-dummy
       s1: Bringing 0uV into 675000-675000uV
       s2: supplied by regulator-dummy
       s2: Bringing 0uV into 500000-500000uV
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       s3: supplied by regulator-dummy
       s3: Bringing 0uV into 500000-500000uV
       s4: supplied by regulator-dummy
       s4: Bringing 0uV into 500000-500000uV
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       s5: supplied by regulator-dummy
       s6: supplied by regulator-dummy
       rtc-pm8xxx fc4cf000.spmi:pm8941@0:rtc@6000: setting system clock to 1970-01-03T12:08:21 UTC (216501)
->     ### dt-test ### start of unittest - you will see error messages
ok     Duplicate name in testcase-data, renamed to "duplicate-name#1"
       s7: supplied by regulator-dummy
       s8: supplied by regulator-dummy
ok     OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1
       s1: supplied by regulator-dummy
ok     OF: /testcase-data/phandle-tests/consumer-a: could not get #phandle-cells-missing for /testcase-data/phandle-tests/provider1
       s1: Bringing 0uV into 1300000-1300000uV
       s2: supplied by regulator-dummy
ok     OF: /testcase-data/phandle-tests/consumer-a: could not find phandle
       sdhci_msm f98a4900.sdhci: Got CD GPIO
ok     OF: /testcase-data/phandle-tests/consumer-a: could not find phandle
       s2: Bringing 0uV into 2150000-2150000uV
       s3: supplied by regulator-dummy
ok     OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1
       s3: Bringing 0uV into 1800000-1800000uV
       l1: supplied by s1
ok     OF: /testcase-data/phandle-tests/consumer-a: #phandle-cells = 3 found -1
       l1: Bringing 0uV into 1225000-1225000uV
       l2: supplied by s3
ok     OF: /testcase-data/phandle-tests/consumer-b: could not get #phandle-missing-cells for /testcase-data/phandle-tests/provider1
       l2: Bringing 0uV into 1200000-1200000uV
ok     OF: /testcase-data/phandle-tests/consumer-b: could not find phandle
       l3: supplied by s1
       l3: Bringing 0uV into 1225000-1225000uV
ok     OF: /testcase-data/phandle-tests/consumer-b: #phandle-cells = 2 found -1
       l4: supplied by s1
       l4: Bringing 0uV into 1225000-1225000uV
ok     platform testcase-data:testcase-device2: IRQ index 0 not found
       l5: supplied by s2
       l5: Bringing 0uV into 1800000-1800000uV
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest0/status
       l6: supplied by s2
       sdhci_msm f98a4900.sdhci: Got CD GPIO
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest1/status
       l6: Bringing 0uV into 1800000-1800000uV
       l7: supplied by s2
       l7: Bringing 0uV into 1800000-1800000uV
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l8: supplied by regulator-dummy
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest2/status
       l8: Bringing 0uV into 1800000-1800000uV
       l9: supplied by regulator-dummy
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest3/status
       l9: Bringing 0uV into 1800000-1800000uV
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l10: supplied by regulator-dummy
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest5/status
       l10: Bringing 0uV into 1800000-1800000uV
       l11: supplied by s1
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest6/status
       l11: Bringing 0uV into 1300000-1300000uV
       l12: supplied by s2
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest7/status
       l12: Bringing 0uV into 1800000-1800000uV
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l13: supplied by regulator-dummy
       l13: Bringing 0uV into 1800000-1800000uV
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/status
       l14: supplied by s2
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/test-unittest8/property-foo
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l14: Bringing 0uV into 1800000-1800000uV
ok     OF: overlay: node_overlaps_later_cs: #6 overlaps with #7 @/testcase-data/overlay-node/test-bus/test-unittest8
ok     OF: overlay: overlay #6 is not topmost
       l15: supplied by s2
ok     i2c i2c-1: Added multiplexed i2c bus 2
       l15: Bringing 0uV into 2050000-2050000uV
       l16: supplied by regulator-dummy
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest12/status
       l16: Bringing 0uV into 2700000-2700000uV
       l17: supplied by regulator-dummy
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l17: Bringing 0uV into 2700000-2700000uV
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data/overlay-node/test-bus/i2c-test-bus/test-unittest13/status
       l18: supplied by regulator-dummy
       l18: Bringing 0uV into 2850000-2850000uV
ok     i2c i2c-1: Added multiplexed i2c bus 3
       l19: supplied by regulator-dummy
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       l19: Bringing 0uV into 3300000-3300000uV
       l20: supplied by regulator-dummy
       l20: Bringing 0uV into 2950000-2950000uV
       GPIO line 315 (line-B-input) hogged as input
       l21: supplied by regulator-dummy
       GPIO line 309 (line-A-input) hogged as input
       l21: Bringing 0uV into 2950000-2950000uV
**     (of_unittest_expect WARNING - not found ---> ) GPIO line <<int>> (line-A-input) hogged as input
       l22: supplied by regulator-dummy
**     (of_unittest_expect WARNING - not found ---> ) GPIO line <<int>> (line-B-input) hogged as input
       l22: Bringing 0uV into 3000000-3000000uV
       l23: supplied by regulator-dummy
       GPIO line 307 (line-D-input) hogged as input
       l23: Bringing 0uV into 3000000-3000000uV
**     (of_unittest_expect WARNING - not found ---> ) GPIO line <<int>> (line-D-input) hogged as input
       l24: supplied by regulator-dummy
       l24: Bringing 0uV into 3075000-3075000uV
       mmc0: SDHCI controller on f9824900.sdhci [f9824900.sdhci] using ADMA
       lvs1: supplied by s3
**     (of_unittest_expect WARNING - not found ---> ) GPIO line <<int>> (line-C-input) hogged as input
       lvs2: supplied by s3
>>     ### dt-test ### FAIL of_unittest_overlay_gpio():2668 unittest_gpio_chip_request() called 0 times (expected 1 time)
       lvs3: supplied by s3
       sdhci_msm f98a4900.sdhci: Got CD GPIO
       5vs1: supplied by s4
       5vs2: supplied by s4
       mmc1: SDHCI controller on f98a4900.sdhci [f98a4900.sdhci] using ADMA
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/status
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/status
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@30/incline-up
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/fairway-1/ride@100/track@40/incline-up
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/status
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/color
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/lights@40000/rate
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/hvac_2
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_left
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /__symbols__/ride_200_right
ok     OF: overlay: ERROR: multiple fragments add and/or delete node /testcase-data-2/substation@100/motor-1/controller
ok     OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/controller/name
       mmc1: new ultra high speed DDR50 SDHC card at address aaaa
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail
       mmcblk1: mmc1:aaaa SU16G 14.8 GiB 
ok     OF: overlay: WARNING: memory leak will occur if overlay removed, property: /testcase-data-2/substation@100/motor-1/rpm_avail
ok     OF: overlay: ERROR: multiple fragments add, update, and/or delete property /testcase-data-2/substation@100/motor-1/rpm_avail
        mmcblk1: p1
->     ### dt-test ### end of unittest - 258 passed, 1 failed
       mmc0: new HS200 MMC card at address 0001
       ALSA device list:
         No soundcards found.
       mmcblk0: mmc0:0001 SEM16[    4.341533] mmcblk0boot1: mmc0:0001 SEM16G partition 2 4.00 MiB
       mmcblk0rpmb: mmc0:0001 SEM16G partition 3 4.00 MiB, chardev (247:0)
       Freeing unused kernel memory: 1024K
       Run /init as init process
        mmcblk0: p1 p2 p3 p4 p5 p6 p7 p8 p9 p10 p11 p12 p13 p14 p15 p16 p17 p18 p19 p20
       mkdir: can't create directory '/bin': File exists
       mkdir: can't create directory '/dev': File exists
       /init: line 25: can't create /proc/sys/kernel/hotplug: nonexistent directory
       mdev: unknown user/group 'root:uucp' on line 34
       Attempt to mount partitions: /usr/system /usr/data
       Mounting partitions from: /dev/mmcblk0
       EXT4-fs (mmcblk0p12): mounted filesystem with ordered data mode. Opts: (null)
       EXT4-fs (mmcblk0p13): recovery complete
       EXT4-fs (mmcblk0p13): mounted filesystem with ordered data mode. Opts: (null)
       / # [    5.288378] random: fast init done
       
       / # cat /proc/version
       Linux version 5.5.0-rc2-00002-gbc60035cbebc-dirty (frowand@xps8900) (gcc version 4.6.x-google 20120106 (prerelease) (GCC)) #26 SMP PREEMPT Wed Jan 15 11:12:23 CST 2020
       / #