https://github.com/fdu/STM32F429I-disco_Buildroot
My boot Log:
[ 0.000000] Booting Linux on physical CPU 0x0
[ 0.000000] Linux version 4.15.7 (root@GE-Laptop-Eric) (gcc version 6.4.0 (Buildroot 2018.02)) #4 PREEMPT Thu Oct 18 19:07:44 PDT 2018
[ 0.000000] CPU: ARMv7-M [410fc241] revision 1 (ARMv7M), cr=00000000
[ 0.000000] CPU: unknown data cache, unknown instruction cache
[ 0.000000] OF: fdt: Machine model: STMicroelectronics STM32F429i-DISCO board
[ 0.000000] Built 1 zonelists, mobility grouping off. Total pages: 2032
[ 0.000000] Kernel command line: root=/dev/ram
[ 0.000000] Dentry cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.000000] Inode-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.000000] Memory: 7788K/8192K available (1193K kernel code, 127K rwdata, 404K rodata, 63K init, 114K bss, 404K reserved, 0K cma-reserved)
[ 0.000000] Virtual kernel memory layout:
[ 0.000000] vector : 0x00000000 - 0x00001000 ( 4 kB)
[ 0.000000] fixmap : 0xffc00000 - 0xfff00000 (3072 kB)
[ 0.000000] vmalloc : 0x00000000 - 0xffffffff (4095 MB)
[ 0.000000] lowmem : 0x90000000 - 0x90800000 ( 8 MB)
[ 0.000000] .text : 0x(ptrval) - 0x(ptrval) (1598 kB)
[ 0.000000] .init : 0x(ptrval) - 0x(ptrval) ( 12 kB)
[ 0.000000] .data : 0x(ptrval) - 0x(ptrval) ( 128 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] Preemptible hierarchical RCU implementation.
[ 0.000000] Tasks RCU enabled.
[ 0.000000] NR_IRQS: 16, nr_irqs: 16, preallocated irqs: 16
[ 0.000000] interrupt-controller@40013c00: bank0, External IRQs available:0x7fffff
[ 0.000000] clocksource: arm_system_timer: mask: 0xffffff max_cycles: 0xffffff, max_idle_ns: 331816030 ns
[ 0.000000] ARM System timer initialized as clocksource
[ 0.000000] /soc/timer@40000c00: STM32 clockevent driver initialized (32 bits)
[ 0.000000] sched_clock: 32 bits at 100 Hz, resolution 10000000ns, wraps every 21474836475000000ns
[ 0.080000] Calibrating delay loop... 118.68 BogoMIPS (lpj=593408)
[ 0.090000] pid_max: default: 4096 minimum: 301
[ 0.090000] Mount-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.090000] Mountpoint-cache hash table entries: 1024 (order: 0, 4096 bytes)
[ 0.090000] Hierarchical SRCU implementation.
[ 0.100000] devtmpfs: initialized
[ 0.140000] clocksource: jiffies: mask: 0xffffffff max_cycles: 0xffffffff, max_idle_ns: 19112604462750000 ns
[ 0.140000] pinctrl core: initialized pinctrl subsystem
[ 0.170000] stm32f429-pinctrl soc: pin-controller: GPIOA bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOB bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOC bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOD bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOE bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOF bank added
[ 0.180000] stm32f429-pinctrl soc: pin-controller: GPIOG bank added
[ 0.190000] stm32f429-pinctrl soc: pin-controller: GPIOH bank added
[ 0.190000] stm32f429-pinctrl soc: pin-controller: GPIOI bank added
[ 0.190000] stm32f429-pinctrl soc: pin-controller: GPIOJ bank added
[ 0.190000] stm32f429-pinctrl soc: pin-controller: GPIOK bank added
[ 0.190000] stm32f429-pinctrl soc: pin-controller: Pinctrl STM32 initialized
[ 0.240000] stm32-dma 40026000.dma-controller: STM32 DMA driver registered
[ 0.250000] stm32-dma 40026400.dma-controller: STM32 DMA driver registered
[ 0.250000] clocksource: Switched to clocksource arm_system_timer
[ 0.670000] workingset: timestamp_bits=30 max_order=11 bucket_order=0
[ 0.700000] random: fast init done
[ 0.750000] io scheduler noop registered (default)
[ 0.750000] io scheduler mq-deadline registered
[ 0.750000] io scheduler kyber registered
[ 0.750000] STM32 USART driver initialized
[ 0.760000] 40011000.serial: ttyS0 at MMIO 0x40011000 (irq = 32, base_baud = 5625000) is a stm32-usart
[ 1.120000] console [ttyS0] enabled
[ 1.120000] stm32_rtc 40002800.rtc: rtc core: registered 40002800.rtc as rtc0
[ 1.140000] stm32_rtc 40002800.rtc: Date/Time must be initialized
[ 1.140000] i2c /dev entries driver
[ 1.160000] input: gpio_keys as /devices/platform/gpio_keys/input/input0
[ 1.170000] stm32_rtc 40002800.rtc: setting system clock to 2000-01-01 00:09:40 UTC (946685380)
[ 1.180000] Freeing unused kernel memory: 12K
[ 1.180000] This architecture does not have kernel memory protection.
[ 1.210000]
[ 1.210000] Unhandled exception: IPSR = 00000006 LR = fffffff1
[ 1.210000] CPU: 0 PID: 1 Comm: init Not tainted 4.15.7 #4
[ 1.210000] Hardware name: STM32 (Device Tree Support)
[ 1.210000] PC is at ret_fast_syscall+0x2/0x58
[ 1.210000] LR is at tty_ioctl+0x3df/0x578
[ 1.210000] pc : [<08009942>] lr : [<080cc0d7>] psr: 4000000b
[ 1.210000] sp : 90791fa8 ip : 0000001c fp : 9040ecb8
[ 1.210000] r10: 00000000 r9 : 90790000 r8 : 08009b00
[ 1.210000] r7 : 00000036 r6 : 90444ef0 r5 : 00000000 r4 : 90444f4c
[ 1.210000] r3 : 00000000 r2 : 00000000 r1 : 00000000 r0 : 00000000
[ 1.210000] xPSR: 4000000b
[ 1.210000] CPU: 0 PID: 1 Comm: init Not tainted 4.15.7 #4
[ 1.210000] Hardware name: STM32 (Device Tree Support)
[ 1.210000] [<0800be85>] (unwind_backtrace) from [<0800b20f>] (show_stack+0xb/0xc)
[ 1.210000] [<0800b20f>] (show_stack) from [<0800b7e3>] (__invalid_entry+0x4b/0x4c)