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Boot and Kernel configure & build with PetaLinux without BSP (board support package)

Create Vivado design and export the hardware with bitstream.
Default hdf (hardware description file) location is:
```
<project_directory>/<project_name>.sdk/
```
In case you need it (but usually you shouldn't), default bitstream location is:
```
<project_directory>/<project_name>.runs/impl_1/
```
Setup PetaLinux enviroment (see Install PetaLinux)

Create PetaLinux project:

petalinux-create --type project --template zynq --name <boot_project_name>
cd <boot_project_name>

Get hardware description from Vivado project:

petalinux-config --get-hw-description=<absolute_path_to_vivado_project_directory>/<project_name>.sdk/

Set booting from SD card by navigating through settings tree and choosing the proper options:

Subsystem AUTO Hardware Settings -> Advanced bootable images storage Settings -> boot image settings  : set ‘image storage media’ option to ‘primary sd’
                                                                              -> kernel image settings: set ‘image storage media’ option to ‘primary sd’
                                                                              -> dtb image settings   : set ‘image storage media’ option to ‘primary sd’
Image Packaging Configurations: set ‘Root filesystem type’ option to ‘SD card’

Select Exit and write the configuration.
In case you want to reconfigure boot settings, run:

petalinux-config

Check whether all required drivers/modules are enabled in kernel config:
```
petalinux-config -c kernel
```
Hint: you can use vim-like search /<search_string> to list all enabled drivers/modules.
For example, for axi_gpio the following driver options should be enabled:
```
GPIO_SYSFS
SYSFS
GPIO_XILINX
```
If search result list is empty, the selected driver/module is not enabled.

Fix the u-boot bug – a typo in default boot command.
The proper boot configure entry:

default_bootcmd=run uenvboot; run cp_kernel2ram && bootm ${netstart}

is created by PetaLinux as

default_bootcmd=run uenvboot; run cp_kernel2ram && run cp_dtb2ram && booti ${netstart} - ${dtbnetstart}

with the typo in booti instead of bootm command.
To fix this bug, edit the platform-top.h file (after all other configuration is done):

vim ./project-spec/meta-user/recipes-bsp/u-boot/files/platform-top.h

and add the following entry at the end:

/* Due to a bug where having u-boot load dtb from SD card causes the boot
 * command to default to using booti instead of bootm on Zynq, the defult build
 * fails to boot. This boot command override is a temporary workaround.
*/
#ifdef CONFIG_BOOTCOMMAND
#undef CONFIG_BOOTCOMMAND
#define CONFIG_BOOTCOMMAND	"run uenvboot; run cp_kernel2ram && run cp_dtb2ram && bootm ${netstart} - ${dtbnetstart}"
#endif

Speed up the boot process by disabling the netboot: edit the platform-top.h file (see previous point) and add the following entries at the end:

#ifdef CONFIG_BOOTDELAY
#undef CONFIG_BOOTDELAY
#endif
#define CONFIG_BOOTDELAY        0

#ifdef CONFIG_ENV_IS_IN_SPI_FLASH
#undef CONFIG_ENV_IS_IN_SPI_FLASH
#endif
#define CONFIG_ENV_IS_NOWHERE

#undef CONFIG_NETCONSOLE
#undef CONFIG_CMD_DHCP
#undef CONFIG_CMD_MII
#undef CONFIG_CMD_NET
#undef CONFIG_CMD_PING
#undef CONFIG_CMD_NFS

/* PREBOOT */
#ifdef CONFIG_PREBOOT
#undef CONFIG_PREBOOT
#endif
#define CONFIG_PREBOOT  "echo U-BOOT for ${hostname};setenv preboot; echo no-net"

Build the boot and kernel files:
```
petalinux-build
```
Determinate the bit file name in PetaLinux project (it is copied automatically from Vivado design by –get-hw-description):
```
ls ./images/linux/*.bin
```

Create BOOT.BIN image:

petalinux-package --boot --format BIN --fsbl ./images/linux/zynq_fsbl.elf --fpga ./images/linux/<bit_filename>.bit --u-boot

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Boot and Kernel configure & build with PetaLinux without BSP (board support package)

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