刚入坑微型计算机，入手了荔枝派nano，香橙派的H3，还有一个X3的卡片电脑，结果都是人家编译好的系统。liunx系统也不怎么会玩。请各位大佬指条路，该怎么学习呢，本打算从荔枝派开始，烧录镜像启动运行，串口通讯都可以，想着手头只有小屏（spi7789v) ，玩51，arduino，stm32用的，就想用一下，uboot查不到资料，主线liunx里倒是有驱动，可是编译都是错误。。。。。搞了2天也没成，求大佬出手教教我，@晕哥！！
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具体出现什么错误呢?
linux驱动st7789本站有帖子，右上角搜一下
嗯我下载了主线liunx进行编译，配置输出选择st7789v，但编译报错。
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lovexulu 说：嗯我下载了主线liunx进行编译，配置输出选择st7789v，但编译报错。
其实吧，我觉得吧，编译报错这个事还是得调才知道毕竟每个人的编译环境呀，工具呀什么的都有差异。而且你刚入门，可以先学习学习别人怎么玩的。
驱动SPI的显示屏的例子有很多。学习的话，刚好可以尝试自己写下驱动。
萌新啊，刚从单片机过来，对这块基本上啥都不懂，没有什么概念框架，别说写驱动了，系统构成，下载步骤，都还没搞清除。说不定有数据手册跑裸机还能当单片机用。。。。。应该还是对系统不了解，对linux系统不够了解，通过昨天一天突击，总算了解了一点点启动过程，理论上的启动过程，慢慢学习吧，编译错误先放一下。
今天尝试编译linux5.8，居然成了。。。。
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make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs -j4
无法生成设备树dtb文件。但也没报错？！
执行如下：
root@xulu:/home/xulu/uliunx/linux# make ARCH=arm CROSS_COMPILE=arm-linux-gnueabi- dtbs -j4
CHK include/config/kernel.release
CHK include/generated/uapi/linux/version.h
CHK scripts/mod/devicetable-offsets.h
CHK include/generated/utsrelease.h
CHK include/generated/bounds.h
CHK include/generated/timeconst.h
CHK include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
root@xulu:/home/xulu/uliunx/linux#
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@lovexulu 已经执行成功了, 这个指令是编译所有 dtb 文件.
看起来是成功了，可是在dts文件夹下并没有dtd文件生成。
重新下载了一个linux源码就可以了。也不知道什么原因，重新编译后已经可以正确引导启动，但st7789v仍然无法驱动，设备树以及代码部分已经参考 https://www.cnblogs.com/listenscience/p/13619930.html 这个修改过了，并正确编译镜像，在启动过程中没发现有st7789加载。。。
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这是引导启动的打印
U-Boot SPL 2018.01-05676-g00188782ee (Aug 09 2018 - 18:49:43)
DRAM: 32 MiB
Trying to boot from MMC1
U-Boot 2018.01-05676-g00188782ee (Aug 09 2018 - 18:49:43 +0800) Allwinner Techno logy
CPU: Allwinner F Series (SUNIV)
Model: Lichee Pi Nano
DRAM: 32 MiB
MMC: SUNXI SD/MMC: 0
SF: unrecognized JEDEC id bytes: 0b, 40, 18
*** Warning - spi_flash_probe_bus_cs() failed, using default environment
Setting up a 800x600 lcd console (overscan 0x0)
In: serial@1c25000
Out: serial@1c25000
Err: serial@1c25000
Net: No ethernet found.
starting USB...
No 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
reading /boot.scr
280 bytes read in 15 ms (17.6 KiB/s)
## Executing script at 80c50000
reading suniv-f1c100s-licheepi-nano.dtb
7629 bytes read in 26 ms (286.1 KiB/s)
reading zImage
3893392 bytes read in 339 ms (11 MiB/s)
## Flattened Device Tree blob at 80c00000
Booting using the fdt blob at 0x80c00000
Loading Device Tree to 80e60000, end 80e64dcc ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.2.0-licheepi-nano+ (xulu@xulu) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #35 Sat Sep 12 21:59:15 CST 2020
[ 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: Lichee Pi Nano
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 8128
[ 0.000000] Kernel command line: console=tty0 console=ttyS0,115200 panic=5 ro otwait root=/dev/mmcblk0p2 rw
[ 0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Memory: 22704K/32768K available (6144K kernel code, 235K rwdata, 1468K rodata, 1024K init, 227K bss, 10064K reserved, 0K cma-reserved, 0K highmem )
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] random: get_random_bytes called from start_kernel+0x254/0x42c wit h crng_init=0
[ 0.000047] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478 484971ns
[ 0.000115] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_ idle_ns: 79635851949 ns
[ 0.000682] Console: colour dummy device 80x30
[ 0.001052] printk: console [tty0] enabled
[ 0.001143] Calibrating delay loop... 358.80 BogoMIPS (lpj=1794048)
[ 0.050264] pid_max: default: 32768 minimum: 301
[ 0.050659] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.050720] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.052286] CPU: Testing write buffer coherency: ok
[ 0.054542] Setting up static identity map for 0x80100000 - 0x80100058
[ 0.056641] devtmpfs: initialized
[ 0.061635] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, ma x_idle_ns: 19112604462750000 ns
[ 0.061785] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.062131] pinctrl core: initialized pinctrl subsystem
[ 0.064329] NET: Registered protocol family 16
[ 0.066129] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.067960] cpuidle: using governor menu
[ 0.116196] SCSI subsystem initialized
[ 0.116626] usbcore: registered new interface driver usbfs
[ 0.116822] usbcore: registered new interface driver hub
[ 0.117114] usbcore: registered new device driver usb
[ 0.117613] pps_core: LinuxPPS API ver. 1 registered
[ 0.117683] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giome tti <giometti@linux.it>
[ 0.118228] Advanced Linux Sound Architecture Driver Initialized.
[ 0.119780] clocksource: Switched to clocksource timer
[ 0.147870] NET: Registered protocol family 2
[ 0.149379] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes)
[ 0.149565] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.149650] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.149719] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.150261] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.150394] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.150968] NET: Registered protocol family 1
[ 0.153310] NetWinder Floating Point Emulator V0.97 (double precision)
[ 0.155409] Initialise system trusted keyrings
[ 0.156075] workingset: timestamp_bits=30 max_order=13 bucket_order=0
[ 0.176686] Key type asymmetric registered
[ 0.176785] Asymmetric key parser 'x509' registered
[ 0.177002] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 2 52)
[ 0.177080] io scheduler mq-deadline registered
[ 0.177117] io scheduler kyber registered
[ 0.178967] sun4i-usb-phy 1c13400.phy: Couldn't request ID GPIO
[ 0.187697] suniv-f1c100s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driv er
[ 0.361335] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.366603] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc -pe not found, using dummy regulator
[ 0.368304] printk: console [ttyS0] disabled
[ 0.388646] 1c25000.serial: ttyS0 at MMIO 0x1c25000 (irq = 22, base_baud = 62 50000) is a 16550A
[ 0.772373] printk: console [ttyS0] enabled
[ 0.780014] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc -pd not found, using dummy regulator
[ 0.796461] SCSI Media Changer driver v0.25
[ 0.802224] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.808824] ehci-platform: EHCI generic platform driver
[ 0.814462] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.820843] ohci-platform: OHCI generic platform driver
[ 0.826538] usbcore: registered new interface driver usb-storage
[ 0.833675] udc-core: couldn't find an available UDC - added [g_cdc] to list of pending drivers
[ 0.842852] i2c /dev entries driver
[ 0.847962] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc -pf not found, using dummy regulator
[ 0.886100] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 0.895287] usbcore: registered new interface driver usbhid
[ 0.901068] usbhid: USB HID core driver
[ 0.919168] NET: Registered protocol family 17
[ 0.923978] Key type dns_resolver registered
[ 0.930832] Loading compiled-in X.509 certificates
[ 0.946578] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc -pd not found, using dummy regulator
[ 0.958077] sun4i-backend 1e60000.display-backend: Couldn't find matching fro ntend, frontend features disabled
[ 0.968947] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0 737d54)
[ 0.977915] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc07 369ac)
[ 0.985764] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 0.992460] [drm] No driver support for vblank timestamp query.
[ 1.000048] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
[ 1.033529] mmc0: host does not support reading read-only switch, assuming wr ite-enable
[ 1.038115] mmc0: new high speed SDHC card at address 0215
[ 1.041519] mmcblk0: mmc0:0215 APPSD 7.66 GiB
[ 1.044127] mmcblk0: p1 p2
[ 1.052718] Console: switching to colour frame buffer device 60x34
[ 1.111751] sun4i-drm display-engine: fb0: sun4i-drmdrmfb frame buffer device
[ 1.127776] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto su pply vcc not found, using dummy regulator
[ 1.150973] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 1.164543] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 1.182144] hub 1-0:1.0: USB hub found
[ 1.190157] hub 1-0:1.0: 1 port detected
[ 1.199400] using random self ethernet address
[ 1.207941] using random host ethernet address
[ 1.217884] usb0: HOST MAC ee:41:df:22:12:d3
[ 1.226312] usb0: MAC da:b5:dd:01:37:54
[ 1.234061] g_cdc gadget: CDC Composite Gadget, version: King Kamehameha Day 2008
[ 1.248894] g_cdc gadget: g_cdc ready
[ 1.257207] cfg80211: Loading compiled-in X.509 certificates for regulatory d atabase
[ 1.279347] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.293454] ALSA device list:
[ 1.300137] #0: Loopback 1
[ 1.307422] platform regulatory.0: Direct firmware load for regulatory.db fai led with error -2
[ 1.323223] cfg80211: failed to load regulatory.db
[ 1.643964] random: fast init done
[ 2.265942] EXT4-fs (mmcblk0p2): recovery complete
[ 2.568393] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. O pts: (null)
[ 2.583707] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 2.597935] devtmpfs: mounted
[ 2.609009] Freeing unused kernel memory: 1024K
[ 2.617236] Run /sbin/init as init process
[ 2.806112] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
Starting logging: OK
Initializing random number generator... [ 3.086239] random: dd: uninitialized urandom read (512 bytes read)
done.
Welcome to Lichee Pi
Lichee login: root
Password:离线
你的 spi 都没有驱动.
大牛解说下这是什么原因，需要怎么操作，是不是在配置里修改，或者设备树添加节点？我已经在设备树中添加了SPI节点。。。
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[ 1.547683] graphics fb0: fb_st7789v frame buffer, 240x135, 63 KiB video memory, 4 KiB buffer memory, fps=33, spi0.0 at 32 MHz
[ 1.576839] NET: Registered protocol family 17
[ 1.583143] Key type dns_resolver registered
[ 1.595225] Loading compiled-in X.509 certificates
[ 1.613810] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 1.628404] sun4i-backend 1e60000.display-backend: Couldn't find matching frontend, frontend features disabled
[ 1.642288] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0737d54)
[ 1.653617] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc07369ac)
[ 1.662968] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.671143] [drm] No driver support for vblank timestamp query.
[ 1.681118] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
重新修改设备树配置检查spi都打开了。多了这些启动信息。
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设备fb0生成了，试一试
cat /dev/urandom > /dev/fb0
# cat /dev/urandom > /dev/fb0
cat: write error: No space left on device
#
没有剩余空间？！
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lovexulu 说：# cat /dev/urandom > /dev/fb0
cat: write error: No space left on device
#
没有剩余空间？！看下屏幕有没有变化?
没有变化，我觉得还是我的设备树有问题
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我想我可能走了弯路，一上来就按照网上的文章修改了树，节点，还有驱动程序代码。明天再来一次。按照标准设置走一遍。
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CPU: Allwinner F Series (SUNIV)
Model: Lichee Pi Nano
DRAM: 32 MiB
MMC: SUNXI SD/MMC: 0
SF: unrecognized JEDEC id bytes: 0b, 40, 18
*** Warning - spi_flash_probe_bus_cs() failed, using default environment
Setting up a 800x600 lcd console (overscan 0x0)
In: serial@1c25000
Out: serial@1c25000
Err: serial@1c25000
Net: No ethernet found.
starting USB...
No 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
reading /boot.scr
280 bytes read in 15 ms (17.6 KiB/s)
## Executing script at 80c50000
reading suniv-f1c100s-licheepi-nano.dtb
7642 bytes read in 26 ms (286.1 KiB/s)
reading zImage
3890544 bytes read in 324 ms (11.5 MiB/s)
## Flattened Device Tree blob at 80c00000
Booting using the fdt blob at 0x80c00000
Loading Device Tree to 80e60000, end 80e64dd9 ... OK
Starting kernel ...
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 5.2.0lovexulu+ (xulu@xulu) (gcc version 7.2.1 20171011 (Linaro GCC 7.2-2017.11)) #36 Sun Sep 13 15:38:27 CST 2020
[ 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: Lichee Pi Nano
[ 0.000000] Memory policy: Data cache writeback
[ 0.000000] Built 1 zonelists, mobility grouping on. Total pages: 8128
[ 0.000000] Kernel command line: console=tty0 console=ttyS0,115200 panic=5 rootwait root=/dev/mmcblk0p2 rw
[ 0.000000] Dentry cache hash table entries: 4096 (order: 2, 16384 bytes)
[ 0.000000] Inode-cache hash table entries: 2048 (order: 1, 8192 bytes)
[ 0.000000] Memory: 22704K/32768K available (6144K kernel code, 235K rwdata, 1468K rodata, 1024K init, 227K bss, 10064K reserved, 0K cma-reserved, 0K highmem)
[ 0.000000] SLUB: HWalign=32, Order=0-3, MinObjects=0, CPUs=1, Nodes=1
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] random: get_random_bytes called from start_kernel+0x254/0x42c with crng_init=0
[ 0.000047] sched_clock: 32 bits at 24MHz, resolution 41ns, wraps every 89478484971ns
[ 0.000116] clocksource: timer: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 79635851949 ns
[ 0.000652] Console: colour dummy device 80x30
[ 0.001022] printk: console [tty0] enabled
[ 0.001114] Calibrating delay loop... 358.80 BogoMIPS (lpj=1794048)
[ 0.050272] pid_max: default: 32768 minimum: 301
[ 0.050648] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.050712] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.052275] CPU: Testing write buffer coherency: ok
[ 0.054479] Setting up static identity map for 0x80100000 - 0x80100058
[ 0.056587] devtmpfs: initialized
[ 0.061699] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.061854] futex hash table entries: 256 (order: -1, 3072 bytes)
[ 0.062203] pinctrl core: initialized pinctrl subsystem
[ 0.064370] NET: Registered protocol family 16
[ 0.066172] DMA: preallocated 256 KiB pool for atomic coherent allocations
[ 0.068036] cpuidle: using governor menu
[ 0.116178] SCSI subsystem initialized
[ 0.116653] usbcore: registered new interface driver usbfs
[ 0.116873] usbcore: registered new interface driver hub
[ 0.117116] usbcore: registered new device driver usb
[ 0.117624] pps_core: LinuxPPS API ver. 1 registered
[ 0.117703] pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
[ 0.118316] Advanced Linux Sound Architecture Driver Initialized.
[ 0.119872] clocksource: Switched to clocksource timer
[ 0.148068] NET: Registered protocol family 2
[ 0.149587] tcp_listen_portaddr_hash hash table entries: 512 (order: 0, 4096 bytes)
[ 0.149777] TCP established hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.150012] TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.150106] TCP: Hash tables configured (established 1024 bind 1024)
[ 0.150504] UDP hash table entries: 256 (order: 0, 4096 bytes)
[ 0.150617] UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
[ 0.151188] NET: Registered protocol family 1
[ 0.153503] NetWinder Floating Point Emulator V0.97 (double precision)
[ 0.155596] Initialise system trusted keyrings
[ 0.156278] workingset: timestamp_bits=30 max_order=13 bucket_order=0
[ 0.176860] Key type asymmetric registered
[ 0.176971] Asymmetric key parser 'x509' registered
[ 0.177196] Block layer SCSI generic (bsg) driver version 0.4 loaded (major 252)
[ 0.177271] io scheduler mq-deadline registered
[ 0.177303] io scheduler kyber registered
[ 0.179187] sun4i-usb-phy 1c13400.phy: Couldn't request ID GPIO
[ 0.188151] suniv-f1c100s-pinctrl 1c20800.pinctrl: initialized sunXi PIO driver
[ 0.362437] Serial: 8250/16550 driver, 8 ports, IRQ sharing disabled
[ 0.367751] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pe not found, using dummy regulator
[ 0.369458] printk: console [ttyS0] disabled
[ 0.389798] 1c25000.serial: ttyS0 at MMIO 0x1c25000 (irq = 23, base_baud = 6250000) is a 16550A
[ 0.773212] printk: console [ttyS0] enabled
[ 0.780829] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 0.797530] SCSI Media Changer driver v0.25
[ 0.803239] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pa not found, using dummy regulator
[ 0.816111] ehci_hcd: USB 2.0 'Enhanced' Host Controller (EHCI) Driver
[ 0.822865] ehci-platform: EHCI generic platform driver
[ 0.828420] ohci_hcd: USB 1.1 'Open' Host Controller (OHCI) Driver
[ 0.834809] ohci-platform: OHCI generic platform driver
[ 0.840574] usbcore: registered new interface driver usb-storage
[ 0.847576] udc-core: couldn't find an available UDC - added [g_cdc] to list of pending drivers
[ 0.856802] i2c /dev entries driver
[ 0.862001] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pf not found, using dummy regulator
[ 0.900111] sunxi-mmc 1c0f000.mmc: initialized, max. request size: 16384 KB
[ 0.909242] usbcore: registered new interface driver usbhid
[ 0.915035] usbhid: USB HID core driver
[ 0.919136] fbtft_of_value: buswidth = 8
[ 0.923227] fbtft_of_value: debug = 0
[ 0.926928] fbtft_of_value: rotate = 0
[ 0.930765] fbtft_of_value: fps = 30
[ 0.964446] mmc0: host does not support reading read-only switch, assuming write-enable
[ 0.977216] mmc0: new high speed SDHC card at address 0215
[ 0.987284] mmcblk0: mmc0:0215 APPSD 7.66 GiB
[ 0.994926] mmcblk0: p1 p2
[ 1.513392] random: fast init done
[ 1.538761] Console: switching to colour frame buffer device 30x16
[ 1.547601] graphics fb0: fb_st7789v frame buffer, 240x135, 63 KiB video memory, 4 KiB buffer memory, fps=33, spi1.0 at 32 MHz
[ 1.576700] NET: Registered protocol family 17
[ 1.583043] Key type dns_resolver registered
[ 1.595093] Loading compiled-in X.509 certificates
[ 1.613793] suniv-f1c100s-pinctrl 1c20800.pinctrl: 1c20800.pinctrl supply vcc-pd not found, using dummy regulator
[ 1.628405] sun4i-backend 1e60000.display-backend: Couldn't find matching frontend, frontend features disabled
[ 1.642265] sun4i-drm display-engine: bound 1e60000.display-backend (ops 0xc0737d54)
[ 1.653259] sun4i-drm display-engine: bound 1c0c000.lcd-controller (ops 0xc07369ac)
[ 1.662601] [drm] Supports vblank timestamp caching Rev 2 (21.10.2013).
[ 1.670770] [drm] No driver support for vblank timestamp query.
[ 1.680782] [drm] Initialized sun4i-drm 1.0.0 20150629 for display-engine on minor 0
[ 1.693769] sun4i-drm display-engine: fb1: sun4i-drmdrmfb frame buffer device
[ 1.703805] usb_phy_generic usb_phy_generic.0.auto: usb_phy_generic.0.auto supply vcc not found, using dummy regulator
[ 1.718147] musb-hdrc musb-hdrc.1.auto: MUSB HDRC host driver
[ 1.725621] musb-hdrc musb-hdrc.1.auto: new USB bus registered, assigned bus number 1
[ 1.741756] hub 1-0:1.0: USB hub found
[ 1.747590] hub 1-0:1.0: 1 port detected
[ 1.755985] using random self ethernet address
[ 1.761681] using random host ethernet address
[ 1.770154] usb0: HOST MAC d6:57:09:94:ba:ed
[ 1.775690] usb0: MAC da:67:1c:c9:fb:9a
[ 1.780803] g_cdc gadget: CDC Composite Gadget, version: King Kamehameha Day 2008
[ 1.789964] g_cdc gadget: g_cdc ready
[ 1.796507] cfg80211: Loading compiled-in X.509 certificates for regulatory database
[ 1.820945] cfg80211: Loaded X.509 cert 'sforshee: 00b28ddf47aef9cea7'
[ 1.829573] ALSA device list:
[ 1.833723] #0: Loopback 1
[ 1.838422] platform regulatory.0: Direct firmware load for regulatory.db failed with error -2
[ 1.849184] cfg80211: failed to load regulatory.db
[ 1.881413] EXT4-fs (mmcblk0p2): mounted filesystem with ordered data mode. Opts: (null)
[ 1.891821] VFS: Mounted root (ext4 filesystem) on device 179:2.
[ 1.901297] devtmpfs: mounted
[ 1.909298] Freeing unused kernel memory: 1024K
[ 1.915263] Run /sbin/init as init process
[ 2.112724] EXT4-fs (mmcblk0p2): re-mounted. Opts: (null)
[ 2.154298] random: crng init done
Starting logging: OK
Initializing random number generator... done.
Welcome to Lichee Pi
Lichee login: root
Password:
# ls
littlevgl_demo
# cd /
# ls
bin lib media proc sbin usr
dev lib32 mnt root sys var
etc linuxrc opt run tmp
# cd sys
#
# ls
block class devices fs module
bus dev firmware kernel power
# cd class
# ls
backlight graphics mmc_host scsi_changer thermal
bdi i2c-adapter mtd scsi_device tty
block i2c-dev net scsi_disk udc
bsg ieee80211 phy scsi_generic vc
dma input power_supply scsi_host vtconsole
drm leds pps sound
extcon mem pwm spi_master
gpio misc regulator spidev
# cd spidev
# ls
# cd ..
# cd spi_master
# ls
spi1SPI1应该是加载了，可为什么没有显示呢？？
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进程中有SPI1在运行，头疼。。。。没头绪了
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# cd /
# ls
bin lib32 mnt rootfs.tar tmp
dev linuxrc opt run usr
etc lost+found proc sbin var
lib media root sys
# cd sys/bus/spi
# ls
devices drivers_autoprobe uevent
drivers drivers_probe
# cd drivers
# ls
fb_st7789v spidev
# cd fb_st7789v
# ls
bind uevent unbind
#
到这里了，不知道为啥还是没显示输出呢？求教。。。。。
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st7789 驱动只有写, 没有读, 系统根本不知道有没有ss7789, 所以你用逻辑分析仪抓一下SPI总线, 看时序是否正确.
流下了无奈的眼泪，我这里木有示波器，逻辑分析仪，只有一台万用表。。。
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经过几天的突击学习。终于可以在这块1.14寸spi屏上看到启动log了。运行了几个dome。还行，最高刷新帧率能达到55+（白屏）。这几天也是汤坑无数，有硬件问题，更多的是软件问题，设备树，驱动程序，等等，现在还有些问题我还解决不了，再努力学习吧，这几天也让我从一个萌新蜕变成了一个小白。。特此记录一下。
主要问题如下：1、硬件连接RST->PE7,DC->PE10,CS->GND,其他按照spi标准接就行。
2、设备树添加节点，io口描述，节点中要有使能。
3、由于添加PE7,PE10需要额外申请gpio，申请gpio的程序代码目前版本中存在问题。
4、目前版本中st7789v的驱动伽马矫正存在问题，有色差。且针对1.14寸屏有显示坐标偏差，行偏52，列偏40。
参照这位大牛的博客。https://www.cnblogs.com/listenscience/p/13619930.html
我也是问了很多问题才解决的。
至于下一个目标。。另开一帖吧。。
最近编辑记录 lovexulu (2020-09-16 22:01:47)
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