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kumquat-buildroot/board/stmicroelectronics/stm32f429-disco
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Dario Binacchi c85312affd configs/stm32f429_disco: fix kernel bootup 
The kernel generated by the configuration for the STM32f429-discovery
board is buggy:

Fixes:
 Unhandled exception: IPSR = 00000006 LR = fffffff1
 CPU: 0 PID: 1 Comm: init Not tainted 4.11.0 #2
 Hardware name: STM32 (Device Tree Support)
 task: 9041a000 task.stack: 907c0000
 PC is at ret_fast_syscall+0x2/0x4a
 LR is at tty_ioctl+0x1ad/0x75c
 pc : [<0800d942>]    lr : [<080c2e05>]    psr: 4000000b
 sp : 907c1fa8  ip : 0000001c  fp : 905961a2
 r10: 00000000  r9 : 907c0000  r8 : 0800dae0
 r7 : 00000036  r6 : 905e7e60  r5 : 00000000  r4 : 905e7ebc
 r3 : 00000000  r2 : 00000000  r1 : 00000000  r0 : 00000000
 xPSR: 4000000b
 CPU: 0 PID: 1 Comm: init Not tainted 4.11.0 #2
 Hardware name: STM32 (Device Tree Support)
 [<0800fbf9>] (unwind_backtrace) from [<0800f05b>] (show_stack+0xb/0xc)
 [<0800f05b>] (show_stack) from [<0800f553>] (__invalid_entry+0x4b/0x4c)

Inspired by commit a3e3d9c198 ("configs/stm32f469_disco_xip_defconfig:
alternative defconfig for XIP"), update the stm32f429_disco_defconfig
configuration to use a newer kernel. Current setup kernel + rootfs fits
in 1.6MB on-chip flash memory.

The kernel has been moved to new flash bank due to growth of dtb size.

Remove upstream patch.

For better binary size optimization gcc LTO is turned on.

Signed-off-by: Dario Binacchi <dariobin@libero.it>
Acked-by: Christophe Priouzeau <christophe.priouzeau@foss.st.com>
Signed-off-by: Arnout Vandecappelle (Essensium/Mind) <arnout@mind.be>
2021-12-17 22:58:11 +01:00
..
flash.sh
linux.config
readme.txt

readme.txt 

STM32F429 Discovery
===================

This tutorial describes how to use the predefined Buildroot
configuration for the STM32F429 Discovery evaluation platform.

Supported HW
------------

 - STM32F429I-DISCO evaluation board
 - STM32F429I-DISC1 evaluation board

Building
--------

  make stm32f429_disco_defconfig
  make

Wire the UART
-------------

Use a USB to TTL adapter, and connect:

 - RX to PA9
 - TX to PA10
 - GND to one of the GND available on the board

The UART is configured at 115200.

Flashing
--------

  ./board/stmicroelectronics/stm32f429-disco/flash.sh output/ \
      {stm32f429discovery|stm32f429disc1}

It will flash the minimal bootloader, the Device Tree Blob, and the
kernel image which includes the root filesystem as initramfs.