于是，双十一我买了几片。同时，对我的linux板做了小幅改版：将SPI Flash容量扩大到32MB并连接到F750的QSPI BANK1，添加了CAN收发器和接口，增加了两个I2C外设（温湿度传感器和气压传感器）。板子做回来后先焊了一片，调试过程还算比较顺利，现在u-boot和Linux都工作起来了，下面是系统启动log，F750速度还是相当快的（427.62 BogoMIPS，F429跑Linux只有35.84 BogoMIPS），QSPI的加载速度也很给力。下一步我准备多测试几种STM32外设的Linux driver，emcraft现在的SDK比两三年前多了不少外设驱动，可以都试试看。

U-Boot 2010.03 (Nov 26 2018 - 21:30:21)

CPU  : STM32F7 (Cortex-M7)
Freqs: SYSCLK=216MHz,HCLK=216MHz,PCLK1=54MHz,PCLK2=108MHz
Board: STM32F750 Rev 1.0, www.emcraft.com
DRAM:  64 MB
In:    serial
Out:   serial
Err:   serial
QSPI:  32 MB mapped at 0x90000000
Net:   miiphy_register done.
eth hw init done.
STM32_MAC
Hit any key to stop autoboot:  0
Booting from QSPI
## Booting kernel from Legacy Image at c0007fc0 ...
   Image Name:   Linux-4.2.0
   Image Type:   ARM Linux Multi-File Image (uncompressed)
   Data Size:    7496295 Bytes =  7.1 MB
   Load Address: c0008000
   Entry Point:  c0008001
   Contents:
      Image 0: 7471388 Bytes =  7.1 MB
      Image 1: 24895 Bytes = 24.3 kB
   Verifying Checksum ... OK
## Flattened Device Tree from multi component Image at C0007FC0
   Booting using the fdt at 0xc0728128
   Loading Multi-File Image ... OK
OK
WARNING: legacy format multi component image overwritten
   Loading Device Tree to c3ff6000, end c3fff13e ... OK

Starting kernel ...

Booting Linux on physical CPU 0x0
Linux version 4.2.0 (hw@localhost.localdomain) (gcc version 4.4.1 (Sourcery G++ Lite 2010
q1-189) ) #90 Tue Dec 4 03:32:33 EST 2018
CPU: ARMv7-M [410fc271] revision 1 (ARMv7M), cr=00000000
CPU: WBA data cache, WBA instruction cache
Machine model: EmCraft Systems STM32F7-SOM board
Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 16256
Kernel command line: stm32_platform=stm32f7-disco console=ttyS0,115200 panic=10 ip=169.25
4.1.10:169.254.1.2:::stm32f7-disco:eth0:off
PID hash table entries: 256 (order: -2, 1024 bytes)
Dentry cache hash table entries: 8192 (order: 3, 32768 bytes)
Inode-cache hash table entries: 4096 (order: 2, 16384 bytes)
Memory: 56432K/65536K available (2523K kernel code, 181K rwdata, 588K rodata, 4000K init,
 111K bss, 9104K reserved, 0K cma-reserved)
Virtual kernel memory layout:
    vector  : 0x00000000 - 0x00001000   (   4 kB)
    fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
    vmalloc : 0x00000000 - 0xffffffff   (4095 MB)
    lowmem  : 0xc0000000 - 0xc4000000   (  64 MB)
      .text : 0xc0008000 - 0xc0312000   (3112 kB)
      .init : 0xc0312000 - 0xc06fa000   (4000 kB)
      .data : 0xc06fa000 - 0xc07277c0   ( 182 kB)
       .bss : 0xc072811c - 0xc0743e84   ( 112 kB)
NR_IRQS:16 nr_irqs:16 16
/interrupt-controller@40013c00: 24 External IRQs detected
clocksource: arm_system_timer: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 27651335
8 ns
ARM System timer initialized as clocksource
/soc/timer@40000000: STM32 clockevent driver initialized (32 bits)
sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
Calibrating delay loop... 427.62 BogoMIPS (lpj=2138112)
pid_max: default: 4096 minimum: 301
Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
devtmpfs: initialized
clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 1911260446275
0000 ns
pinctrl core: initialized pinctrl subsystem
NET: Registered protocol family 16
stm32-pinctrl pin-controller: nbanks = 11
stm32-pinctrl pin-controller: nfunctions = 20
stm32-pinctrl pin-controller: ngroups = 23
stm32-pinctrl pin-controller: GPIOA bank added.
stm32-pinctrl pin-controller: GPIOB bank added.
stm32-pinctrl pin-controller: GPIOC bank added.
stm32-pinctrl pin-controller: GPIOD bank added.
stm32-pinctrl pin-controller: GPIOE bank added.
stm32-pinctrl pin-controller: GPIOF bank added.
stm32-pinctrl pin-controller: GPIOG bank added.
stm32-pinctrl pin-controller: GPIOH bank added.
stm32-pinctrl pin-controller: GPIOI bank added.
stm32-pinctrl pin-controller: GPIOJ bank added.
stm32-pinctrl pin-controller: GPIOK bank added.
stm32-pinctrl pin-controller: Function[0         name:i2c_1,    groups:1]
stm32-pinctrl pin-controller: Function[1         name:i2c_2,    groups:1]
stm32-pinctrl pin-controller: Function[2         name:i2c_3,    groups:1]
stm32-pinctrl pin-controller: Function[3         name:mac,      groups:2]
stm32-pinctrl pin-controller: Function[4         name:sdio,     groups:1]
stm32-pinctrl pin-controller: Function[5         name:spi_2,    groups:1]
stm32-pinctrl pin-controller: Function[6         name:spi_4,    groups:1]
stm32-pinctrl pin-controller: Function[7         name:spi_5,    groups:1]
stm32-pinctrl pin-controller: Function[8         name:usart1,   groups:1]
stm32-pinctrl pin-controller: Function[9         name:usart6,   groups:1]
stm32-pinctrl pin-controller: Function[10        name:usart7,   groups:1]
stm32-pinctrl pin-controller: Function[11        name:usb_fs,   groups:1]
stm32-pinctrl pin-controller: Function[12        name:usb_hs,   groups:1]
stm32-pinctrl pin-controller: Function[13        name:can_1,    groups:1]
stm32-pinctrl pin-controller: Function[14        name:adc1_in0_pin,     groups:1]
stm32-pinctrl pin-controller: Function[15        name:dac_out2_pin,     groups:1]
stm32-pinctrl pin-controller: Function[16        name:ltdc,     groups:1]
stm32-pinctrl pin-controller: Function[17        name:sai_2,    groups:1]
stm32-pinctrl pin-controller: Function[18        name:i2c_4,    groups:1]
stm32-pinctrl pin-controller: Function[19        name:gpio,     groups:3]
stm32-dma 40026000.dma: STM32 DMA driver registered
stm32-dma 40026400.dma: STM32 DMA driver registered
SCSI subsystem initialized
usbcore: registered new interface driver usbfs
usbcore: registered new interface driver hub
usbcore: registered new device driver usb
soc:phy_hs supply vcc not found, using dummy regulator
soc:phy_fs supply vcc not found, using dummy regulator
pps_core: LinuxPPS API ver. 1 registered
pps_core: Software ver. 5.3.6 - Copyright 2005-2007 Rodolfo Giometti <giometti@linux.it>
PTP clock support registered
Advanced Linux Sound Architecture Driver Initialized.
Bluetooth: Core ver 2.20
NET: Registered protocol family 31
Bluetooth: HCI device and connection manager initialized
Bluetooth: HCI socket layer initialized
Bluetooth: L2CAP socket layer initialized
Bluetooth: SCO socket layer initialized
clocksource: Switched to clocksource arm_system_timer
NET: Registered protocol family 2
TCP established hash table entries: 1024 (order: 0, 4096 bytes)
TCP bind hash table entries: 1024 (order: 0, 4096 bytes)
TCP: Hash tables configured (established 1024 bind 1024)
UDP hash table entries: 256 (order: 0, 4096 bytes)
UDP-Lite hash table entries: 256 (order: 0, 4096 bytes)
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.
Power Management for STM32
futex hash table entries: 16 (order: -5, 192 bytes)
jffs2: version 2.2. (NAND) (SUMMARY)  漏 2001-2006 Red Hat, Inc.
fuse init (API version 7.23)
Block layer SCSI generic (bsg) driver version 0.4 loaded (major 250)
io scheduler noop registered
io scheduler cfq registered (default)
stm32-pinctrl pin-controller: maps: function gpio group pwms num 2
stm32-pwm pwm0: basing on TIM3.1(x16)
stm32-pinctrl pin-controller: maps: function ltdc group ltdc-0 num 29
stm32_lcdfb 40016800.ltdc: fb0: fb device registered successfully
STM32 USART driver initialized
stm32-pinctrl pin-controller: maps: function usart1 group usart1-0 num 3
40011000.serial: ttyS0 at MMIO 0x40011000 (irq = 34, base_baud = 6750000) is a stm32-usar
t
console [ttyS0] enabled
stm32-pinctrl pin-controller: maps: function usart6 group usart6-0 num 3
。。。

。。。

g_serial gadget: Gadget Serial v2.4
g_serial gadget: g_serial ready
dwc2 50000000.usb: bound driver g_serial
i2c /dev entries driver
stm32-pinctrl pin-controller: maps: function i2c_4 group i2c_4-0 num 3
bmp085 3-0077: Successfully initialized bmp085!
stm32f7-i2c 40006000.i2c: I2C Controller i2c-3 at 40006000,irq=58
Driver for 1-wire Dallas network protocol.
usbcore: registered new interface driver btusb
stm32-pinctrl pin-controller: maps: function sdio group sdio-0 num 7
mmci-pl18x 40012c00.sdi: Got CD GPIO
mmci-pl18x 40012c00.sdi: mmc0: PL180 manf 80 rev4 at 0x40012c00 irq 37,0 (pio)
stm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 3 - was already request
ed
mmci-pl18x 40012c00.sdi: DMA channels RX dma1chan3, TX dma1chan3
stm32_gpio_to_irq: Event line 3 now points to fire interrupts from bank G
stm32-pinctrl pin-controller: maps: function gpio group outs num 2
hidraw: raw HID events driver (C) Jiri Kosina
usbcore: registered new interface driver usbhid
usbhid: USB HID core driver
stm32-pinctrl pin-controller: maps: function adc1_in0_pin group adc1-0 num 2
stm32f4-adc 40012000.adc: registered
stm32-pinctrl pin-controller: maps: function sai_2 group sai_2-0 num 5
stm32-dma 40026400.dma: stm32_dma_of_xlate: unable to get channel 4 - was already request
ed
stm32-asoc-card sound: failed to find codec platform device
stm32-asoc-card: probe of sound failed with error -22
NET: Registered protocol family 17
can: controller area network core (rev 20120528 abi 9)
NET: Registered protocol family 29
can: raw protocol (rev 20120528)
can: broadcast manager protocol (rev 20120528 t)
can: netlink gateway (rev 20130117) max_hops=1
Bluetooth: RFCOMM TTY layer initialized
Bluetooth: RFCOMM socket layer initialized
Bluetooth: RFCOMM ver 1.11
hctosys: unable to open rtc device (rtc0)
vmmc: disabling
Freeing unused kernel memory: 4000K (c0312000 - c06fa000)
init started: BusyBox v1.24.2 (2018-11-22 20:35:58 EST)
stm32-dwmac 40028000.ethernet eth0: Link is Up - 100Mbps/Full - flow control rx/tx

/ # free
             total       used       free     shared    buffers     cached
Mem:         60432       8140      52292          0          0       4792
-/+ buffers/cache:       3348      57084
/ #

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