Part Number: OMAPL138
CPU是omapL138，使用linux4.19.94
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启动脚本如下：在内核崩溃的时候的时候会在前面出现类似下面的语句：
tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000004): Sync lost
tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000005): Sync lost
tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000005): Sync lost
如果系统能正常启动，不崩溃时，上面这样的提示是没有的。
Starting kernel ... [ 0.000000] Booting Linux on physical CPU 0x0 [ 0.000000] Linux version 4.19.94-gbe5389fd85 (xxx@xxxx-vm) (gcc version 8.2.0 (GCC)) #63 Mon Apr 8 09:12:00 CST 2024 [ 0.000000] CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=0005317f [ 0.000000] CPU: VIVT data cache, VIVT instruction cache [ 0.000000] OF: fdt: Machine model: DA850/AM1808/OMAP-L138 LCDK [ 0.000000] Memory policy: Data cache writethrough [ 0.000000] Reserved memory: created CMA memory pool at 0xc3000000, size 16 MiB [ 0.000000] OF: reserved mem: initialized node dsp-memory@c3000000, compatible id shared-dma-pool [ 0.000000] cma: Reserved 24 MiB at 0xc1800000 [ 0.000000] DaVinci da850/omap-l138/am18x variant 0x1 [ 0.000000] random: get_random_bytes called from start_kernel+0x84/0x3e8 with crng_init=0 [ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 16256 [ 0.000000] Kernel command line: root=ubi0_0 ubi.mtd=3 rootwait rw rootfstype=ubifs rootflags=sync init=/linuxrc console=ttyS1,115200n8 mem=64M [ 0.000000] Dentry cache hash table entries: 8192 (order: 3, 32768 bytes) [ 0.000000] Inode-cache hash table entries: 4096 (order: 2, 16384 bytes) [ 0.000000] Memory: 14356K/65536K available (6495K kernel code, 389K rwdata, 2200K rodata, 248K init, 114K bss, 10220K reserved, 40960K cma-reserved) [ 0.000000] Virtual kernel memory layout: [ 0.000000] vector : 0xffff0000 - 0xffff1000 ( 4 kB) [ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB) [ 0.000000] vmalloc : 0x84800000 - 0xff800000 (1968 MB) [ 0.000000] lowmem : 0x80000000 - 0x84000000 ( 64 MB) [ 0.000000] modules : 0x7f000000 - 0x80000000 ( 16 MB) [ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (6497 kB) [ 0.000000] .init : 0x(ptrval) - 0x(ptrval) ( 248 kB) [ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 390 kB) [ 0.000000] .bss : 0x(ptrval) - 0x(ptrval) ( 115 kB) [ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1 [ 0.000000] NR_IRQS: 245 [ 0.000000] clocksource: timer0_1: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns [ 0.000000] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns [ 0.000531] Console: colour dummy device 80x30 [ 0.000728] Calibrating delay loop... 227.32 BogoMIPS (lpj=1136640) [ 0.070125] pid_max: default: 32768 minimum: 301 [ 0.070744] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.070827] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes) [ 0.072885] CPU: Testing write buffer coherency: ok [ 0.076529] Setting up static identity map for 0xc0008400 - 0xc0008458 [ 0.080245] devtmpfs: initialized [ 0.099651] VFP support v0.3: not present [ 0.101110] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns [ 0.101221] futex hash table entries: 256 (order: 0, 7168 bytes) [ 0.111903] pinctrl core: initialized pinctrl subsystem [ 0.116767] NET: Registered protocol family 16 [ 0.121958] DMA: preallocated 256 KiB pool for atomic coherent allocations [ 0.125635] cpuidle: using governor ladder [ 0.125699] cpuidle: using governor menu [ 0.126623] mux: initialized RTC_ALARM [ 0.126680] mux: Setting register RTC_ALARM [ 0.126718] mux: PINMUX0 (0x00000000) = 0x44080000 -> 0x24080000 [ 0.161406] gpiochip_add_data_with_key: GPIOs 0..143 (davinci_gpio.0) failed to register, -517 [ 0.205985] edma 1e30000.edma: memcpy is disabled [ 0.219312] edma 1e30000.edma: TI EDMA DMA engine driver [ 0.222521] vcc_3v3d: supplied by vcc_5vd [ 0.224435] vcc_1v8d: supplied by vcc_5vd [ 0.231499] SCSI subsystem initialized [ 0.232933] usbcore: registered new interface driver usbfs [ 0.233292] usbcore: registered new interface driver hub [ 0.233788] usbcore: registered new device driver usb [ 0.235119] media: Linux media interface: v0.10 [ 0.235425] videodev: Linux video capture interface: v2.00 [ 0.235746] pps_core: LinuxPPS API ver. 1 registered [ 0.235793] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it> [ 0.235935] PTP clock support registered [ 0.242677] clocksource: Switched to clocksource timer0_1 [ 0.303731] NET: Registered protocol family 2 [ 0.306887] tcp_listen_portaddr_hash hash table entries: 256 (order: 0, 6144 bytes) [ 0.307042] TCP established hash table entries: 1024 (order: 0, 4096 bytes) [ 0.307168] TCP bind hash table entries: 1024 (order: 2, 20480 bytes) [ 0.307395] TCP: Hash tables configured (established 1024 bind 1024) [ 0.307855] UDP hash table entries: 256 (order: 1, 12288 bytes) [ 0.308064] UDP-Lite hash table entries: 256 (order: 1, 12288 bytes) [ 0.309040] NET: Registered protocol family 1 [ 0.311586] RPC: Registered named UNIX socket transport module. [ 0.311654] RPC: Registered udp transport module. [ 0.311682] RPC: Registered tcp transport module. [ 0.311708] RPC: Registered tcp NFSv4.1 backchannel transport module. [ 0.318350] workingset: timestamp_bits=30 max_order=14 bucket_order=0 [ 0.363069] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 248) [ 0.363148] io scheduler noop registered (default) [ 0.363190] io scheduler mq-deadline registered [ 0.363224] io scheduler kyber registered [ 0.367401] da8xx-usb-phy 1c1417c.chip-controller:usb-phy: Failed to get usb1_clk48 [ 0.369847] pinctrl-single 1c14120.pinmux: 160 pins, size 80 [ 0.758016] Serial: 8250/16550 driver, 10 ports, IRQ sharing disabled [ 0.780032] 1d0d000.serial: ttyS2 at MMIO 0x1d0d000 (irq = 61, base_baud = 9375000) is a TI DA8xx/66AK2x [ 0.785721] 1d0c000.serial: ttyS1 at MMIO 0x1d0c000 (irq = 53, base_baud = 9375000) is a TI DA8xx/66AK2x [ 1.305736] console [ttyS1] enabled [ 1.314995] tilcdc-panel panel: failed to request enable GPIO [ 1.321802] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.329549] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.337693] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.344602] tilcdc 1e13000.display: no encoders/connectors found [ 1.362575] brd: module loaded [ 1.371610] libphy: Fixed MDIO Bus: probed [ 1.442901] davinci_mdio 1e24000.mdio: davinci mdio revision 1.5, bus freq 2200000 [ 1.450503] davinci_mdio 1e24000.mdio: detected phy mask fffffffd [ 1.459724] libphy: 1e24000.mdio: probed [ 1.463891] davinci_mdio 1e24000.mdio: phy[1]: device 1e24000.mdio:01, driver unknown [ 1.475190] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver [ 1.481485] ohci-platform: OHCI generic platform driver [ 1.487535] ohci-da8xx: DA8XX [ 1.492201] usbcore: registered new interface driver usb-storage [ 1.499467] mousedev: PS/2 mouse device common for all mice [ 1.506114] i2c /dev entries driver [ 1.511465] davinci-wdt 1c21000.wdt: heartbeat 60 sec [ 1.520556] sdhci: Secure Digital Host Controller Interface driver [ 1.526926] sdhci: Copyright(c) Pierre Ossman [ 1.533586] sdhci-pltfm: SDHCI platform and OF driver helper [ 1.540888] usbcore: registered new interface driver usbhid [ 1.546649] usbhid: USB HID core driver [ 1.553544] ti-aemif 68000000.aemif: cannot get clock 'aemif' [ 1.565021] NET: Registered protocol family 10 [ 1.573560] Segment Routing with IPv6 [ 1.577580] sit: IPv6, IPv4 and MPLS over IPv4 tunneling driver [ 1.586372] NET: Registered protocol family 17 [ 1.650483] edma 1c00000.edma: memcpy is disabled [ 1.667790] edma 1c00000.edma: TI EDMA DMA engine driver [ 1.678080] tsc2004 0-0048: Linked as a consumer to regulator.2 [ 1.686340] input: TSC200X touchscreen as /devices/platform/soc@1c00000/1c22000.i2c/i2c-0/0-0048/input/input0 [ 1.713106] rtc-pcf8563 0-0051: rtc core: registered rtc-pcf8563 as rtc0 [ 1.728109] 1c42000.serial: ttyS0 at MMIO 0x1c42000 (irq = 25, base_baud = 14250000) is a TI DA8xx/66AK2x [ 1.741071] tilcdc-panel panel: found enable GPIO [ 1.747045] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.754707] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.762971] OF: graph: no port node found in /soc@1c00000/display@213000 [ 1.769711] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013). [ 1.776458] [drm] No driver support for vblank timestamp query. [ 2.292881] tilcdc 1e13000.display: tilcdc_crtc_reset: timeout waiting for framedone [ 2.317165] Console: switching to colour frame buffer device 100x30 [ 2.333820] tilcdc 1e13000.display: fb0: DRM emulated frame buffer device [ 2.343112] [drm] Initialized tilcdc 1.0.0 20121205 for 1e13000.display on minor 0 [ 2.352541] ohci-da8xx 1e00000.usb: USB Host Controller [ 2.359137] ohci-da8xx 1e00000.usb: new USB bus registered, assigned bus number 1 [ 2.367832] ohci-da8xx 1e00000.usb: irq 58, io mem 0x01e00000 [ 2.442882] ohci-da8xx 1e00000.usb: init err (00000000 0000) [ 2.448571] ohci-da8xx 1e00000.usb: can't start [ 2.453551] ohci-da8xx 1e00000.usb: startup error -75 [ 2.458673] ohci-da8xx 1e00000.usb: USB bus 1 deregistered [ 2.465404] ohci-da8xx: probe of 1e00000.usb failed with error -75 [ 2.473182] ohci-da8xx 1e25000.usb: USB Host Controller [ 2.479548] ohci-da8xx 1e25000.usb: new USB bus registered, assigned bus number 1 [ 2.488179] ohci-da8xx 1e25000.usb: irq 59, io mem 0x01e25000 [ 2.567816] usb usb1: New USB device found, idVendor=1d6b, idProduct=0001, bcdDevice= 4.19 [ 2.576264] usb usb1: New USB device strings: Mfr=3, Product=2, SerialNumber=1 [ 2.583616] usb usb1: Product: USB Host Controller [ 2.588430] usb usb1: Manufacturer: Linux 4.19.94-gbe5389fd85 ohci_hcd [ 2.595070] usb usb1: SerialNumber: 1e25000.usb [ 2.602333] hub 1-0:1.0: USB hub found [ 2.606504] hub 1-0:1.0: 1 port detected [ 2.614606] davinci_mmc 1c40000.mmc: Got CD GPIO [ 2.646595] davinci_mmc 1c40000.mmc: Using DMA, 4-bit mode [ 2.656863] nand: device found, Manufacturer ID: 0xec, Chip ID: 0xf1 [ 2.663414] nand: Samsung NAND 128MiB 3,3V 8-bit [ 2.668065] nand: 128 MiB, SLC, erase size: 128 KiB, page size: 2048, OOB size: 64 [ 2.676397] Bad block table found at page 65472, version 0x01 [ 2.683012] Bad block table found at page 65408, version 0x01 [ 2.689223] nand_read_bbt: bad block at 0x000006cc0000 [ 2.694517] nand_read_bbt: bad block at 0x000007ba0000 [ 2.699666] nand_read_bbt: bad block at 0x000007d00000 [ 2.705236] 4 fixed-partitions partitions found on MTD device 62000000.nand [ 2.712227] Creating 4 MTD partitions on "62000000.nand": [ 2.717771] random: fast init done [ 2.721284] 0x000000000000-0x000000020000 : "u-boot env" [ 2.731501] 0x000000020000-0x0000000c0000 : "u-boot" [ 2.741552] 0x000000100000-0x000000500000 : "kernel" [ 2.751365] 0x000000500000-0x000007d00000 : "rootfs" [ 2.763546] ftl_cs: FTL header not found. [ 2.770051] davinci_nand 62000000.nand: controller rev. 2.5 [ 2.786976] ubi0: default fastmap pool size: 45 [ 2.791669] ubi0: default fastmap WL pool size: 22 [ 2.796630] ubi0: attaching mtd3 [ 3.031307] mmc0: host does not support reading read-only switch, assuming write-enable [ 3.058488] mmc0: new high speed SDHC card at address aaaa [ 3.075538] mmcblk0: mmc0:aaaa SL16G 14.8 GiB [ 3.093042] usb 1-1: new low-speed USB device number 2 using ohci-da8xx [ 3.106235] mmcblk0: p1 [ 3.183696] ubi0: scanning is finished [ 3.204233] ubi0: attached mtd3 (name "rootfs", size 120 MiB) [ 3.210019] ubi0: PEB size: 131072 bytes (128 KiB), LEB size: 129024 bytes [ 3.217062] ubi0: min./max. I/O unit sizes: 2048/2048, sub-page size 512 [ 3.223892] ubi0: VID header offset: 512 (aligned 512), data offset: 2048 [ 3.230691] ubi0: good PEBs: 958, bad PEBs: 2, corrupted PEBs: 0 [ 3.236844] ubi0: user volume: 1, internal volumes: 1, max. volumes count: 128 [ 3.244203] ubi0: max/mean erase counter: 6/1, WL threshold: 4096, image sequence number: 801901675 [ 3.253359] ubi0: available PEBs: 0, total reserved PEBs: 958, PEBs reserved for bad PEB handling: 18 [ 3.262906] ubi0: background thread "ubi_bgt0d" started, PID 46 [ 3.269313] console [netcon0] enabled [ 3.273160] netconsole: network logging started [ 3.279332] davinci_emac 1e20000.ethernet: incompatible machine/device type for reading mac address [ 3.295724] rtc-pcf8563 0-0051: setting system clock to 2024-04-08 09:10:36 UTC (1712567436) [ 3.320600] UBIFS: parse sync [ 3.333118] UBIFS (ubi0:0): background thread "ubifs_bgt0_0" started, PID 47 [ 3.364255] tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000045): Sync lost [ 3.371214] tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000044): Sync lost [ 3.394353] usb 1-1: New USB device found, idVendor=093a, idProduct=2510, bcdDevice= 1.00 [ 3.402624] usb 1-1: New USB device strings: Mfr=1, Product=2, SerialNumber=0 [ 3.409935] usb 1-1: Product: USB Optical Mouse [ 3.414609] usb 1-1: Manufacturer: PixArt [ 3.419571] tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000004): Sync lost [ 3.426651] tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000005): Sync lost [ 3.433664] tilcdc 1e13000.display: tilcdc_crtc_irq(0x00000005): Sync lost [ 3.445142] UBIFS (ubi0:0): recovery needed [ 3.476249] input: PixArt USB Optical Mouse as /devices/platform/soc@1c00000/1e25000.usb/usb1/1-1/1-1:1.0/0003:093A:2510.0001/input/input1 [ 3.504921] hid-generic 0003:093A:2510.0001: input: USB HID v1.11 Mouse [PixArt USB Optical Mouse] on usb-1e25000.usb-1/input0 [ 3.593444] UBIFS (ubi0:0): recovery completed [ 3.598451] UBIFS (ubi0:0): UBIFS: mounted UBI device 0, volume 0, name "rootfs" [ 3.606045] UBIFS (ubi0:0): LEB size: 129024 bytes (126 KiB), min./max. I/O unit sizes: 2048 bytes/2048 bytes [ 3.616092] UBIFS (ubi0:0): FS size: 119089152 bytes (113 MiB, 923 LEBs), journal size 9033728 bytes (8 MiB, 71 LEBs) [ 3.626804] UBIFS (ubi0:0): reserved for root: 0 bytes (0 KiB) [ 3.632749] UBIFS (ubi0:0): media format: w4/r0 (latest is w5/r0), UUID 79AF9900-125F-4331-9572-8E1F6BFCADE6, small LPT model [ 3.645245] VFS: Mounted root (ubifs filesystem) on device 0:15. [ 3.654345] devtmpfs: mounted [ 3.658685] Freeing unused kernel memory: 248K [ 3.663317] This architecture does not have kernel memory protection. [ 3.669773] Run /linuxrc as init process [ 3.922964] ------------[ cut here ]------------ [ 3.927703] WARNING: CPU: 0 PID: 10 at drivers/gpu/drm/drm_atomic_helper.c:1467 drm_atomic_helper_wait_for_vblanks.part.1+0x280/0x298 [ 3.939829] [CRTC:29:tilcdc crtc] vblank wait timed out [ 3.945144] Modules linked in: [ 3.948251] CPU: 0 PID: 10 Comm: kworker/0:1 Not tainted 4.19.94-gbe5389fd85 #63 [ 3.955735] Hardware name: Generic DA850/OMAP-L138/AM18x [ 3.961094] Workqueue: events output_poll_execute [ 3.965918] Backtrace: [ 3.968447] [<800147fc>] (dump_backtrace) from [<80014a70>] (show_stack+0x18/0x1c) [ 3.976138] r7:00000009 r6:00000000 r5:807fada4 r4:81095cbc [ 3.981846] [<80014a58>] (show_stack) from [<806466f4>] (dump_stack+0x20/0x28) [ 3.989219] [<806466d4>] (dump_stack) from [<80020b44>] (__warn+0xcc/0xf8) [ 3.996240] [<80020a78>] (__warn) from [<800207c0>] (warn_slowpath_fmt+0x4c/0x6c) [ 4.003833] r9:80dc6040 r8:00000001 r7:00000000 r6:00000000 r5:807fb00c r4:808cb028 [ 4.011626] [<80020778>] (warn_slowpath_fmt) from [<80326db8>] (drm_atomic_helper_wait_for_vblanks.part.1+0x280/0x298) [ 4.022420] r3:0000001d r2:807fb00c [ 4.026123] r5:00000000 r4:8135a020 [ 4.029761] [<80326b38>] (drm_atomic_helper_wait_for_vblanks.part.1) from [<80326dec>] (drm_atomic_helper_wait_for_vblanks+0x1c/0x20) [ 4.041863] r10:00000001 r9:0000002c r8:81117c00 r7:00000001 r6:81359800 r5:00000000 [ 4.049790] r4:80dc6040 [ 4.052411] [<80326dd0>] (drm_atomic_helper_wait_for_vblanks) from [<8035edc8>] (tilcdc_commit+0x70/0x84) [ 4.062144] [<8035ed58>] (tilcdc_commit) from [<803462d0>] (drm_atomic_commit+0x48/0x58) [ 4.070367] r7:00000001 r6:81359800 r5:80dc6040 r4:00000000 [ 4.076210] [<80346288>] (drm_atomic_commit) from [<8032b1c0>] (restore_fbdev_mode_atomic+0x1f0/0x204) [ 4.085621] r7:00000001 r6:81359ad4 r5:80dc6040 r4:813da500 [ 4.091336] [<8032afd0>] (restore_fbdev_mode_atomic) from [<8032cf50>] (restore_fbdev_mode+0x4c/0x180) [ 4.100762] r10:00000000 r9:00000000 r8:81117cc0 r7:8090b9e0 r6:00000000 r5:81117c00 [ 4.108692] r4:00000000 [ 4.111283] [<8032cf04>] (restore_fbdev_mode) from [<8032eb20>] (drm_fb_helper_restore_fbdev_mode_unlocked+0x58/0xac) [ 4.121993] r10:00000000 r9:00000000 r8:81117cc0 r7:8090b9e0 r6:00000000 r5:81117c00 [ 4.129920] r4:00000000 [ 4.132508] [<8032eac8>] (drm_fb_helper_restore_fbdev_mode_unlocked) from [<8032eba8>] (drm_fb_helper_set_par+0x34/0x5c) [ 4.143481] r9:00000000 r8:81359800 r7:00000001 r6:81117cc0 r5:00000000 r4:00000000 [ 4.151254] [<8032eb74>] (drm_fb_helper_set_par) from [<8032ea70>] (drm_fb_helper_hotplug_event.part.11+0x94/0xb0) [ 4.161696] r5:00000000 r4:81117c00 [ 4.165400] [<8032e9dc>] (drm_fb_helper_hotplug_event.part.11) from [<8032ec38>] (drm_fb_helper_output_poll_changed+0x30/0x38) [ 4.176888] r7:00000001 r6:00000000 r5:808cb028 r4:81359800 [ 4.182591] [<8032ec08>] (drm_fb_helper_output_poll_changed) from [<8031de7c>] (drm_kms_helper_hotplug_event+0x2c/0x38) [ 4.193498] [<8031de50>] (drm_kms_helper_hotplug_event) from [<8031e060>] (output_poll_execute+0x1a8/0x1c0) [ 4.203348] r5:808cb028 r4:81359b14 [ 4.206979] [<8031deb8>] (output_poll_execute) from [<80036950>] (process_one_work+0x1c8/0x3e8) [ 4.215800] r10:81359b18 r9:00000000 r8:00000000 r7:81750200 r6:808e7840 r5:8100fa80 [ 4.223713] r4:81359b14 [ 4.226301] [<80036788>] (process_one_work) from [<80036b9c>] (worker_thread+0x2c/0x54c) [ 4.234506] r10:808e7840 r9:808f9b70 r8:00000008 r7:808e7864 r6:808e7840 r5:8100fa94 [ 4.242332] r4:8100fa80 [ 4.245019] [<80036b70>] (worker_thread) from [<8003c4b4>] (kthread+0x110/0x128) [ 4.252444] r10:8100fb08 r9:80036b70 r8:8100fa80 r7:8103de80 r6:81094000 r5:81079d00 [ 4.260375] r4:8100fae0 r3:00000000 [ 4.264087] [<8003c3a4>] (kthread) from [<800090e0>] (ret_from_fork+0x14/0x34) [ 4.271313] Exception stack(0x81095fb0 to 0x81095ff8) [ 4.276486] 5fa0: 00000000 00000000 00000000 00000000 [ 4.284751] 5fc0: 00000000 00000000 00000000 00000000 00000000 00000000 00000000 00000000 [ 4.293027] 5fe0: 00000000 00000000 00000000 00000000 00000013 00000000 [ 4.299665] r10:00000000 r9:00000000 r8:00000000 r7:00000000 r6:00000000 r5:8003c3a4 [ 4.307584] r4:81079d00 r3:60000053 [ 4.311178] ---[ end trace c069897e12f724cd ]--- Starting syslogd: OK Starting klogd: OK
液晶屏的设备树代码如下：
