STM32MP1: U-Boot, Buildroot, Arch Linux et un peu de Debian

Quelles en sont les caractéristiques?

Pourquoi STM32MP1?

• Plage de température de fonctionnement. Pour STM32MP1, il commence à moins 40 degrés, tandis que pour de nombreux processeurs d'autres ordinateurs à carte unique, il est bon s'il est de moins 20.
• . STMicroelectronics , .
• . DigiKey Mouser STM32MP1, .

Carte de débogage

Qu'est-ce qu'un logiciel prêt à l'emploi?

Qu'est-ce qu'on fait?

1. Construisez le chargeur de démarrage U-Boot.
2. Construisez le noyau Linux.
3. Nous marquons la carte microSD.
4. Nous écrivons le chargeur de démarrage, le noyau et le système de fichiers racine sur la carte microSD.
5. Profit

Préparation de l'assemblage

apt-get install git
apt-get install make
apt-get install gcc
apt-get install gcc-arm-linux-gnueabihf
apt-get install bison
apt-get install flex
apt-get install g++
apt-get install rsync
apt-get install libncurses-dev

mkdir u-boot
mkdir buildroot
mkdir archlinux

Assemblage U-boot

git clone https://github.com/u-boot/u-boot

CONFIG_DEFAULT_DEVICE_TREE=”stm32mp157c-ev1”

CONFIG_DEFAULT_DEVICE_TREE=”stm32mp157a-dk1”

make CROSS_COMPILE=arm-linux-gnueabihf- stm32mp15_basic_defconfig

make CROSS_COMPILE=arm-linux-gnueabihf-

Assemblage du noyau Linux

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_5_4=y

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_19=y

BR2_LINUX_KERNEL_CUSTOM_VERSION=y
BR2_LINUX_KERNEL_CUSTOM_VERSION_VALUE="5.4.26"

BR2_LINUX_KERNEL_CUSTOM_TARBALL=y
BR2_LINUX_KERNEL_CUSTOM_TARBALL_LOCATION="$(call github,STMicroelectronics,linux,v4.19-stm32mp-r1.2)/linux-v4.19-stm32mp-r1.2.tar.gz"

make CROSS_COMPILE=arm-linux-gnueabihf- stm32mp157a_dk1_new_defconfig

make linux-menuconfig

configure: error: you should not run configure as root (set FORCE_UNSAFE_CONFIGURE=1 in environment to bypass this check)
See `config.log' for more details

export FORCE_UNSAFE_CONFIGURE=1

Et comment ajouter le support de lecteur flash?

SCSI . 80- , , , USB FLASH . Device Drivers -> SCSI support :



USB FLASH . Device Drivers -> USB support USB Mass Storage support:



, FLASH : File systems -> Native language support -> Codepage 437 File systems -> Native language support -> NLS ISO 8859-1:





, USB FLASH .

make CROSS_COMPILE=arm-linux-gnueabihf-

• rootfs.ext2 est un système de fichiers racine compilé avec ext2. Cela ne nous intéresse pas;
• rootfs.ext4 est un système de fichiers racine compilé avec ext4. Il nous sera utile un peu plus tard;
• sdcard.img - Une image d'une carte microSD, y compris FSBL + U-Boot + zImage + rootfs. Un fichier pour les paresseux, il vous permet de ne pas prendre la peine de baliser une carte microSD et d'y télécharger immédiatement l'ensemble du système. Bien sûr, ce n'est pas notre chemin :).
• stm32mp157a-dk1.dtb - fichier d'arborescence de périphériques. Assurez-vous d'être utile pour démarrer le système;
• u-boot.img et u-boot-spl.stm32 - fichier FSBL et U-Boot. Comme nous les avons collectés à la dernière étape, nous n'en avons pas besoin;
  
  Pourquoi les avons-nous collectés séparément?

  , Buildroot U-Boot. , . U-Boot, – Linux.
  
• zImage - le cœur de tout le système - un fichier de noyau Linux compressé.

Partitionnement et sections d'une carte microSD

• Chaque partition doit avoir une taille de 256 Ko.
• , fsbl (fsbl1 fsbl2). : , .

root@debian:/home/myuser# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3
Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present
Found valid GPT with protective MBR; using GPT.
Command (? for help): x
Expert command (? for help): z
About to wipe out GPT on /dev/sdb. Proceed? (Y/N): y
GPT data structures destroyed! You may now partition the disk using fdisk or
other utilities.
Blank out MBR? (Y/N): y

dd if=/dev/zero of=/dev/sdb bs=1M count=64

root@debian:/home/myuser# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: not present
  BSD: not present
  APM: not present
  GPT: not present

Creating new GPT entries.

Command (? for help): o
This option deletes all partitions and creates a new protective MBR.
Proceed? (Y/N): y

Command (? for help): n
Partition number (1-128, default 1): 1
First sector (34-30873566, default = 2048) or {+-}size{KMGTP}: 
Last sector (2048-30873566, default = 30873566) or {+-}size{KMGTP}: +256K
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

Command (? for help): n
Partition number (2-128, default 2): 2
First sector (34-30873566, default = 4096) or {+-}size{KMGTP}: 
Last sector (4096-30873566, default = 30873566) or {+-}size{KMGTP}: +256K
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

Command (? for help): n
Partition number (3-128, default 3): 3
First sector (34-30873566, default = 6144) or {+-}size{KMGTP}: 
Last sector (6144-30873566, default = 30873566) or {+-}size{KMGTP}: +2M
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

Command (? for help): n
Partition number (4-128, default 4): 4
First sector (34-30873566, default = 10240) or {+-}size{KMGTP}: 
Last sector (10240-30873566, default = 30873566) or {+-}size{KMGTP}: +64M
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

Command (? for help): n
Partition number (5-128, default 5): 5
First sector (34-30873566, default = 141312) or {+-}size{KMGTP}: 
Last sector (141312-30873566, default = 30873566) or {+-}size{KMGTP}: 
Current type is 'Linux filesystem'
Hex code or GUID (L to show codes, Enter = 8300): 
Changed type of partition to 'Linux filesystem'

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.

root@debian:/home/myuser# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): c
Partition number (1-5): 1
Enter name: fsbl1

Command (? for help): c
Partition number (1-5): 2
Enter name: fsbl2

Command (? for help): c
Partition number (1-5): 3
Enter name: ssbl

Command (? for help): c
Partition number (1-5): 4
Enter name: kernel

Command (? for help): c
Partition number (1-5): 5
Enter name: roootfs

Command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.

root@debian:/home/myuser# gdisk /dev/sdb
GPT fdisk (gdisk) version 1.0.3

Partition table scan:
  MBR: protective
  BSD: not present
  APM: not present
  GPT: present

Found valid GPT with protective MBR; using GPT.

Command (? for help): x

Expert command (? for help): a
Partition number (1-5): 4
Known attributes are:
0: system partition
1: hide from EFI
2: legacy BIOS bootable
60: read-only
62: hidden
63: do not automount

Attribute value is 0000000000000000. Set fields are:
  No fields set

Toggle which attribute field (0-63, 64 or <Enter> to exit): 2
Have enabled the 'legacy BIOS bootable' attribute.
Attribute value is 0000000000000004. Set fields are:
2 (legacy BIOS bootable)

Toggle which attribute field (0-63, 64 or <Enter> to exit): 

Expert command (? for help): w

Final checks complete. About to write GPT data. THIS WILL OVERWRITE EXISTING
PARTITIONS!!

Do you want to proceed? (Y/N): y
OK; writing new GUID partition table (GPT) to /dev/sdb.
The operation has completed successfully.

mkfs.ext4 /dev/sdb4
mkfs.ext4 /dev/sdb5

e2label /dev/sdb4 kernel
e2label /dev/sdb5 rootfs

Enregistrement sur carte MicroSD

dd if=u-boot/u-boot-spl.stm32 of=/dev/sdb1
dd if=u-boot/u-boot-spl.stm32 of=/dev/sdb2

dd if=u-boot/u-boot.img of=/dev/sdb3

LABEL stm32mp157a-dk1
KERNEL /zImage
FDT /stm32mp157a-dk1.dtb
APPEND root=/dev/mmcblk0p5 rootwait rw console=ttySTM0,115200

cp -a buildroot/output/images/zImage /media/myuser/kernel/

cp -a buildroot/output/images/stm32mp157a-dk1.dtb /media/myuser/kernel/

mkdir /media/myuser/kernel/extlinux

nano /media/myuser/kernel/extlinux/extlinux.conf

LABEL stm32mp157a-dk1
KERNEL /zImage
FDT /stm32mp157a-dk1.dtb
APPEND root=/dev/mmcblk0p5 rootwait rw console=ttySTM0,115200

1. Écrire le système de fichiers racine généré par Buildroot
2. Réécrire le système de fichiers racine Arch Linux

dd if=buildroot/output/images/rootfs.ext4 of=/dev/sdb5

mkfs.ext4 /dev/sdb5

cp -a archlinux/* /media/myuser/rootfs 

rm –rf /media/myuser/rootfs/boot/*

Conclusion