[Buildroot] [PATCH 0/2] Odroid XU4 support

[Buildroot] [PATCH 0/2] Odroid XU4 support

[Andi Shyti]

Hi,

this patchset adds support for the Odroid XU4 board.

The first patch adds the first two stages of boot firmare and the
trust zone, necessary to boot the device.

While the second patch adds the actual support of the board.

Andi

Andi Shyti (2):
  package: add Odroid BL bootloader binaries
  board: add support for the Odroid XU4 board

 board/odroid-xu4/boot.cmd            |  10 +++
 board/odroid-xu4/readme.txt          | 165 +++++++++++++++++++++++++++++++++++
 configs/odroid-xu4_defconfig         |  10 +++
 package/Config.in                    |   1 +
 package/odroid-xu-bl/Config.in       |   6 ++
 package/odroid-xu-bl/odroid-xu-bl.mk |  18 ++++
 6 files changed, 210 insertions(+)
 create mode 100644 board/odroid-xu4/boot.cmd
 create mode 100644 board/odroid-xu4/readme.txt
 create mode 100644 configs/odroid-xu4_defconfig
 create mode 100644 package/odroid-xu-bl/Config.in
 create mode 100644 package/odroid-xu-bl/odroid-xu-bl.mk

-- 
2.8.1

[Buildroot] [PATCH 1/2] package: add Odroid BL bootloader binaries

[Andi Shyti]

The odroid boot process requires three stages of boot plus trust
zone:

	boot level 1

	    |
	    V

	boot level 2

	    |
	    V

	 u-boot

and they need to be raw copied to the SD card in the following
order:

	+----------------+----------------+
	| boot level 1   | 1 block        |
	+----------------+----------------+
	| boot level 2   | 31 block       |
	+----------------+----------------+
	| u-boot         | 63 block       |
	+----------------+----------------+
	| trust zone     | 2111 block     |
	+----------------+----------------+
	| boot partition | 4096 block     |
	+----------------+----------------+
	| rootfs         |                |
	+----------------+----------------+

The above files are provided by the hardkernel u-boot from

 https://github.com/hardkernel/u-boot/tree/odroidxu3-v2012.07

At the end of the compilation the files will be moved to the
output/image directory.

Signed-off-by: Andi Shyti <andi@etezian.org>
---
 package/Config.in                    |  1 +
 package/odroid-xu-bl/Config.in       |  6 ++++++
 package/odroid-xu-bl/odroid-xu-bl.mk | 18 ++++++++++++++++++
 3 files changed, 25 insertions(+)
 create mode 100644 package/odroid-xu-bl/Config.in
 create mode 100644 package/odroid-xu-bl/odroid-xu-bl.mk

diff --git a/package/Config.in b/package/Config.in
index a2a02a8..a596b7e 100644
--- a/package/Config.in
+++ b/package/Config.in
@@ -337,6 +337,7 @@ menu "Firmware"
 	source "package/am33x-cm3/Config.in"
 	source "package/b43-firmware/Config.in"
 	source "package/linux-firmware/Config.in"
+	source "package/odroid-xu-bl/Config.in"
 	source "package/rpi-firmware/Config.in"
 	source "package/sunxi-boards/Config.in"
 	source "package/ux500-firmware/Config.in"
diff --git a/package/odroid-xu-bl/Config.in b/package/odroid-xu-bl/Config.in
new file mode 100644
index 0000000..74d5fe2
--- /dev/null
+++ b/package/odroid-xu-bl/Config.in
@@ -0,0 +1,6 @@
+config BR2_PACKAGE_ODROID_XU_BL
+	bool "odroid-xu-bl"
+	help
+	  Odroid XU3/4 bootloader binaries
+
+	  https://github.com/hardkernel/u-boot/tree/odroidxu3-v2012.07
diff --git a/package/odroid-xu-bl/odroid-xu-bl.mk b/package/odroid-xu-bl/odroid-xu-bl.mk
new file mode 100644
index 0000000..68645e9
--- /dev/null
+++ b/package/odroid-xu-bl/odroid-xu-bl.mk
@@ -0,0 +1,18 @@
+################################################################################
+#
+# odroid-xu-bl
+#
+################################################################################
+
+ODROID_XU_BL_VERSION = odroidxu3-v2012.07
+ODROID_XU_BL_SITE = $(call github,hardkernel,u-boot,$(ODROID_XU_BL_VERSION))
+ODROID_XU_BL_INSTALL_IMAGES = YES
+ODROID_XU_BL_INSTALL_TARGET = NO
+
+define ODROID_XU_BL_INSTALL_IMAGES_CMDS
+	$(INSTALL) -D -m 0644 $(@D)/sd_fuse/hardkernel_1mb_uboot/bl1.bin.hardkernel $(BINARIES_DIR)/bl1.bin.hardkernel
+	$(INSTALL) -D -m 0644 $(@D)/sd_fuse/hardkernel_1mb_uboot/bl2.bin.hardkernel.1mb_uboot $(BINARIES_DIR)/bl2.bin.hardkernel.1mb_uboot
+	$(INSTALL) -D -m 0644 $(@D)/sd_fuse/hardkernel_1mb_uboot/tzsw.bin.hardkernel $(BINARIES_DIR)/tzsw.bin.hardkernel
+endef
+
+$(eval $(generic-package))
-- 
2.8.1

[Buildroot] [PATCH 2/2] board: add support for the Odroid XU4 board

[Andi Shyti]

The Odroid XU4 board is released by hardkernel and has a Samsunx
5422 SoC.

The board is supported both by mainline Linux Kernel and mainline
u-boot. For the latter a boot.cmd script is provided which needs
to be converted to boot.scr

It requires the odroid boot firmware that contains the previous
stages of boot earlier than u-boot

Signed-off-by: Andi Shyti <andi@etezian.org>
---
 board/odroid-xu4/boot.cmd    |  10 +++
 board/odroid-xu4/readme.txt  | 165 +++++++++++++++++++++++++++++++++++++++++++
 configs/odroid-xu4_defconfig |  10 +++
 3 files changed, 185 insertions(+)
 create mode 100644 board/odroid-xu4/boot.cmd
 create mode 100644 board/odroid-xu4/readme.txt
 create mode 100644 configs/odroid-xu4_defconfig

diff --git a/board/odroid-xu4/boot.cmd b/board/odroid-xu4/boot.cmd
new file mode 100644
index 0000000..2fb4c16
--- /dev/null
+++ b/board/odroid-xu4/boot.cmd
@@ -0,0 +1,10 @@
+setenv kernelname zImage;
+setenv boot_kernel "setenv bootargs \"${console} root=/dev/mmcblk${mmcrootdev}p${mmcrootpart} rootfstype=${rootfstype} rootwait ${opts}\";
+load mmc ${mmcbootdev}:${mmcbootpart} 0x40007FC0 '${kernelname}';
+if load mmc ${mmcbootdev}:${mmcbootpart} 40800000 ${fdtfile}; then
+	bootz 0x40007FC0 - 40800000;
+else
+	echo Warning! Booting without DTB: '${fdtfile}'!;
+	bootz 0x40007FC0 -;
+fi;"
+run boot_kernel;
\ No newline at end of file
diff --git a/board/odroid-xu4/readme.txt b/board/odroid-xu4/readme.txt
new file mode 100644
index 0000000..be8113b
--- /dev/null
+++ b/board/odroid-xu4/readme.txt
@@ -0,0 +1,165 @@
+Odroid XU-4 board with Samsung Exynos 5422 SoC
+
+Introduction
+------------
+
+The Odroid XU 4 board is developed and shipped by Hrdkernel (hardkernel.com). It
+uses the Samsung Exynos 5422 Soc.
+
+Odroid boot process
+-------------------
+
+The odroid boot process requires three stages of boot plus trust zone:
+
+    boot level 1
+
+        |
+        V
+
+    boot level 2
+
+        |
+        V
+
+     u-boot
+
+and they need to be raw copied to the SD card in the following order:
+
+    +----------------+----------------+
+    | boot level 1   | 1 block        |
+    +----------------+----------------+
+    | boot level 2   | 31 block       |
+    +----------------+----------------+
+    | u-boot         | 63 block       |
+    +----------------+----------------+
+    | trust zone     | 2111 block     |
+    +----------------+----------------+
+    | boot partition | 4096 block     |
+    +----------------+----------------+
+    | rootfs         |                |
+    +----------------+----------------+
+
+How to build buildroot
+----------------------
+
+Forst of all configure the buildroot environment:
+
+ $ make odroid-xu4_defconfig
+
+If needed personalize the build
+
+ $ make menuconfig
+
+then hit
+
+ $ make
+
+At the end of the build you should get in the output/images directory the
+following files:
+
+ - bl1.bin.hardkernel
+	Level 1 boot loader
+
+ - bl2.bin.hardkernel.1mb_uboot
+	Level 2 boot loader
+
+ - exynos5422-odroidxu4.dtb
+	Linux Kernel Device Tree blop
+
+ - rootfs.tar
+	Compressed root file system image
+
+ - tzsw.bin.hardkernel
+	ARM Truzt Zone
+
+ - u-boot.bin
+	u-boot image
+
+ - zImage
+	Linux Kernel Image
+
+Set up the bootloader
+---------------------
+
+I will assume you will use an sd card which will have as mount point /dev/sdb.
+The above images need to be flashed to the SD card to specific addresses, as
+follows:
+
+ # dd if=bl1.bin.hardkernel of=/dev/sdb seek=1 bs=512
+ # dd if=bl2.bin.hardkernel.1mb_uboot of=/dev/sdb seek=31 bs=512
+ # dd if=u-boot.bin of=/dev/sdb seek=63 bs=512
+ # dd if=tzsw.bin.hardkernel of=/dev/sdb seek=2111 bs=512
+
+With the above we should be able to boot up to the u-boot bootloader.
+
+Set up the SD card
+------------------
+
+The SD card will need to partitions, which you can make with your favourite
+partitioner. At the end it should look like this:
+
+Device         Boot  Start      End  Sectors  Size Id Type
+/dev/sdb1             4096   135167   131072   64M  b W95 FAT32
+/dev/sdb2           135168 15523839 15388672  7.3G 83 Linux
+
+IMPORTANT: Please note that the first partition starts at the block 4096 instead
+of the default 2048. This is due to the sizes of the binaries we flased earlier,
+which go over the 2048 block, therefore, you need to start the first partition
+at a further location, e.g. 4096.
+
+Now format the two partitions, the first as vfat FS type, the second as EXT3 or
+EXT4:
+
+ # mkfs.vfat /dev/sdb1
+ # mkfs.ext4 /dev/sdb2
+
+Finalize the SD card
+--------------------
+
+Now it's time to move Kernel and File System to the SD card. We will start from
+the Kernel partition.
+
+First mount it:
+
+ # mount /dev/sdb1/ /mnt/
+
+and copy kernel and dtb
+
+ # cp <buildroot>/output/images/zImage /mnt/
+ # cp <buildroot>/output/images/exynos5422-odroidxu4.dtb /mnt/
+
+umount the partition
+
+ # sync
+ # umount /dev/sdb1
+
+Mount the rootfs partition:
+
+ # mount /dev/sdb2 /mnt/
+ # tar
+ # cp <buildroot>/output/images/rootfs.tar -C /mnt/
+
+Umount the partition
+
+ # sync
+ # umount /dev/sdb2
+
+The SD card is ready, you can boot now your Odroid XU-4.
+
+Automate u-boot commands
+------------------------
+
+In order to avoid customizing u-boot from the u-boot system at boot time, you
+can use the boot.cmd file in board/odroid-xu4.
+
+Jut run
+
+ $ mkimage -A arm -T script -C none -d boot.cmd boot.scr
+
+the output is an u-boot readable binary which needs to be copied in the first
+partition of the SD card:
+
+ # mount /dev/sdb1 /mnt/
+ # cp boot.scr /mnt/sdb1
+ # sync
+ # umount /dev/sdb1
diff --git a/configs/odroid-xu4_defconfig b/configs/odroid-xu4_defconfig
new file mode 100644
index 0000000..5eca993
--- /dev/null
+++ b/configs/odroid-xu4_defconfig
@@ -0,0 +1,10 @@
+BR2_arm=y
+BR2_cortex_a7=y
+BR2_KERNEL_HEADERS_4_6=y
+BR2_LINUX_KERNEL=y
+BR2_LINUX_KERNEL_DEFCONFIG="exynos"
+BR2_LINUX_KERNEL_DTS_SUPPORT=y
+BR2_LINUX_KERNEL_INTREE_DTS_NAME="exynos5422-odroidxu4"
+BR2_PACKAGE_ODROID_XU_BL=y
+BR2_TARGET_UBOOT=y
+BR2_TARGET_UBOOT_BOARDNAME="odroid-xu3"
-- 
2.8.1

[Buildroot] [PATCH 2/2] board: add support for the Odroid XU4 board

[Baruch Siach]

Hi Andi,

On Sun, Jun 26, 2016 at 05:07:42PM +0300, Andi Shyti wrote:
> The Odroid XU4 board is released by hardkernel and has a Samsunx

Samsung.

> 5422 SoC.

[snip]

> +At the end of the build you should get in the output/images directory the
> +following files:
> +
> + - bl1.bin.hardkernel
> +	Level 1 boot loader
> +
> + - bl2.bin.hardkernel.1mb_uboot
> +	Level 2 boot loader
> +
> + - exynos5422-odroidxu4.dtb
> +	Linux Kernel Device Tree blop
> +
> + - rootfs.tar
> +	Compressed root file system image

Not compressed.

baruch

-- 
     http://baruch.siach.name/blog/                  ~. .~   Tk Open Systems
=}------------------------------------------------ooO--U--Ooo------------{=
   - baruch at tkos.co.il - tel: +972.52.368.4656, http://www.tkos.co.il -

[Buildroot] [PATCH 0/2] Odroid XU4 support

[Thomas Petazzoni]

Hello Andi!

On Sun, 26 Jun 2016 17:07:40 +0300, Andi Shyti wrote:

> this patchset adds support for the Odroid XU4 board.
> 
> The first patch adds the first two stages of boot firmare and the
> trust zone, necessary to boot the device.
> 
> While the second patch adds the actual support of the board.

Thanks for this contribution, it's very useful to have support for
such platforms. I have some comments though, so I'll reply to the
individual patches.

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] [PATCH 1/2] package: add Odroid BL bootloader binaries

[Thomas Petazzoni]

Hello,

On Sun, 26 Jun 2016 17:07:41 +0300, Andi Shyti wrote:

> The above files are provided by the hardkernel u-boot from
> 
>  https://github.com/hardkernel/u-boot/tree/odroidxu3-v2012.07

So the source code for those binary files is not available at all?


> +config BR2_PACKAGE_ODROID_XU_BL
> +	bool "odroid-xu-bl"

	depends on BR2_arm

would be good to have here

Also, I think this package should be included in the Bootloaders menu
rather than the firmware menu. Maybe we should name it
odroid-xu-bootloader or odroid-xu-boot so that it is clear what it does.

> +++ b/package/odroid-xu-bl/odroid-xu-bl.mk
> @@ -0,0 +1,18 @@
> +################################################################################
> +#
> +# odroid-xu-bl
> +#
> +################################################################################
> +
> +ODROID_XU_BL_VERSION = odroidxu3-v2012.07
> +ODROID_XU_BL_SITE = $(call github,hardkernel,u-boot,$(ODROID_XU_BL_VERSION))

It's a bit annoying that we end up downloading an entire U-Boot source
tree, and in fact not use it except for those 3 files.

In fact, why don't you simply build this U-Boot version with the U-Boot
package that already exists in Buildroot, and then use:

BR2_TARGET_UBOOT_SPL=y
BR2_TARGET_UBOOT_SPL_NAME="sd_fuse/hardkernel_1mb_uboot/bl1.bin.hardkernel sd_fuse/hardkernel_1mb_uboot/bl2.bin.hardkernel.1mb_uboot sd_fuse/hardkernel_1mb_uboot/tzsw.bin.hardkernel"

To ask Buildroot to install the pre-built binaries as if they were SPL
images. The only issue is that BR2_TARGET_UBOOT_SPL_NAME currently only
installs a single image, but it can easily be changed. And it was
actually already proposed in https://patchwork.ozlabs.org/patch/595980/.

Can you investigate such a solution?

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] [PATCH 2/2] board: add support for the Odroid XU4 board

[Thomas Petazzoni]

Hello,

On Sun, 26 Jun 2016 17:07:42 +0300, Andi Shyti wrote:

> +Set up the bootloader
> +---------------------
> +
> +I will assume you will use an sd card which will have as mount point /dev/sdb.
> +The above images need to be flashed to the SD card to specific addresses, as
> +follows:
> +
> + # dd if=bl1.bin.hardkernel of=/dev/sdb seek=1 bs=512
> + # dd if=bl2.bin.hardkernel.1mb_uboot of=/dev/sdb seek=31 bs=512
> + # dd if=u-boot.bin of=/dev/sdb seek=63 bs=512
> + # dd if=tzsw.bin.hardkernel of=/dev/sdb seek=2111 bs=512
> +
> +With the above we should be able to boot up to the u-boot bootloader.
> +
> +Set up the SD card
> +------------------
> +
> +The SD card will need to partitions, which you can make with your favourite
> +partitioner. At the end it should look like this:
> +
> +Device         Boot  Start      End  Sectors  Size Id Type
> +/dev/sdb1             4096   135167   131072   64M  b W95 FAT32
> +/dev/sdb2           135168 15523839 15388672  7.3G 83 Linux
> +
> +IMPORTANT: Please note that the first partition starts at the block 4096 instead
> +of the default 2048. This is due to the sizes of the binaries we flased earlier,
> +which go over the 2048 block, therefore, you need to start the first partition
> +at a further location, e.g. 4096.
> +
> +Now format the two partitions, the first as vfat FS type, the second as EXT3 or
> +EXT4:
> +
> + # mkfs.vfat /dev/sdb1
> + # mkfs.ext4 /dev/sdb2
> +
> +Finalize the SD card
> +--------------------
> +
> +Now it's time to move Kernel and File System to the SD card. We will start from
> +the Kernel partition.
> +
> +First mount it:
> +
> + # mount /dev/sdb1/ /mnt/
> +
> +and copy kernel and dtb
> +
> + # cp <buildroot>/output/images/zImage /mnt/
> + # cp <buildroot>/output/images/exynos5422-odroidxu4.dtb /mnt/
> +
> +umount the partition
> +
> + # sync
> + # umount /dev/sdb1
> +
> +Mount the rootfs partition:
> +
> + # mount /dev/sdb2 /mnt/
> + # tar
> + # cp <buildroot>/output/images/rootfs.tar -C /mnt/
> +
> +Umount the partition
> +
> + # sync
> + # umount /dev/sdb2
> +
> +The SD card is ready, you can boot now your Odroid XU-4.

Please replace all this with a genimage script. It allows you to easily
describe a FAT and an ext4 partition, and also allows you to place your
bootloader images at arbitrary offsets.

See board/freescale/imx6ulevk/genimage.cfg for an example.

> +Automate u-boot commands
> +------------------------
> +
> +In order to avoid customizing u-boot from the u-boot system at boot time, you
> +can use the boot.cmd file in board/odroid-xu4.
> +
> +Jut run
> +
> + $ mkimage -A arm -T script -C none -d boot.cmd boot.scr

Please do this in a post-image script, do that boot.scr is directly
produced in output/images, and added to the FAT partition by the
genimage script.

See board/orangepi/orangepipc/post-build.sh for an example.

> diff --git a/configs/odroid-xu4_defconfig b/configs/odroid-xu4_defconfig
> new file mode 100644
> index 0000000..5eca993
> --- /dev/null
> +++ b/configs/odroid-xu4_defconfig
> @@ -0,0 +1,10 @@
> +BR2_arm=y
> +BR2_cortex_a7=y
> +BR2_KERNEL_HEADERS_4_6=y

Please use:

BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_6=y

which tells Buildroot to use the sources of the kernel being built for
the kernel headers.

> +BR2_LINUX_KERNEL=y

You need to specify the exact kernel version that you want to build.

> +BR2_LINUX_KERNEL_DEFCONFIG="exynos"
> +BR2_LINUX_KERNEL_DTS_SUPPORT=y
> +BR2_LINUX_KERNEL_INTREE_DTS_NAME="exynos5422-odroidxu4"
> +BR2_PACKAGE_ODROID_XU_BL=y
> +BR2_TARGET_UBOOT=y

You need to specify the exact U-Boot version that you want to build.
So, as per my reply on PATCH 1/2, it should probably point to the
vendor-specific U-Boot version, so that you can use the pre-built
binaries for the first stage bootloaders.

> +BR2_TARGET_UBOOT_BOARDNAME="odroid-xu3"

Thanks,

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com

[Buildroot] [PATCH 2/2] board: add support for the Odroid XU4 board

[Andi Shyti]

> On Sun, Jun 26, 2016 at 05:07:42PM +0300, Andi Shyti wrote:
> > The Odroid XU4 board is released by hardkernel and has a
> > Samsunx
>
> Samsung.
>
> > 5422 SoC.
>
> [snip]
>
> > +At the end of the build you should get in the output/images
> > directory the
> > +following files:
> > +
> > + - bl1.bin.hardkernel
> > +   Level 1 boot loader
> > +
> > + - bl2.bin.hardkernel.1mb_uboot
> > +   Level 2 boot loader
> > +
> > + - exynos5422-odroidxu4.dtb
> > +   Linux Kernel Device Tree blop
> > +
> > + - rootfs.tar
> > +   Compressed root file system image
>
> Not compressed.

Thanks Baruch, I will fix them.

Andi

[Buildroot] [PATCH 1/2] package: add Odroid BL bootloader binaries

[Andi Shyti]

Hi Thomas,

> > The above files are provided by the hardkernel u-boot from
> > 
> >  https://github.com/hardkernel/u-boot/tree/odroidxu3-v2012.07
> 
> So the source code for those binary files is not available at all?

Unfortunately not, it is not even available to me :(

> > +config BR2_PACKAGE_ODROID_XU_BL
> > +	bool "odroid-xu-bl"
> 
> 	depends on BR2_arm
> 
> would be good to have here

OK.

> Also, I think this package should be included in the Bootloaders menu
> rather than the firmware menu. Maybe we should name it
> odroid-xu-bootloader or odroid-xu-boot so that it is clear what it does.

OK.

> > +ODROID_XU_BL_VERSION = odroidxu3-v2012.07
> > +ODROID_XU_BL_SITE = $(call github,hardkernel,u-boot,$(ODROID_XU_BL_VERSION))
> 
> It's a bit annoying that we end up downloading an entire U-Boot source
> tree, and in fact not use it except for those 3 files.
> 
> In fact, why don't you simply build this U-Boot version with the U-Boot
> package that already exists in Buildroot, and then use:

It is indeed annoying: I don't like the idea of

 1. downloading two u-boot
 2. download u-boot for just two files.

But, on the other hand, I don't like the hardkernel u-boot
either. I think it's old, ugly and too hacky; as a buildroot
user, I would like as much as I can to use mainline software.
Besides, the cool thing of this board is that it is well
supported both from the Linux Kernel and u-boot.

How about creating a new repository with just these three files?
If it sounds good, I will check with the licensing, even though I
don't thing it will be a problem.

Thanks a lot,
Andi

[Buildroot] [PATCH 2/2] board: add support for the Odroid XU4 board

[Andi Shyti]

Hi Thomas,

> > +Finalize the SD card
> > +--------------------
> > +
> > +Now it's time to move Kernel and File System to the SD card. We will start from
> > +the Kernel partition.
> > +
> > +First mount it:
> > +
> > + # mount /dev/sdb1/ /mnt/
> > +
> > +and copy kernel and dtb
> > +
> > + # cp <buildroot>/output/images/zImage /mnt/
> > + # cp <buildroot>/output/images/exynos5422-odroidxu4.dtb /mnt/
> > +
> > +umount the partition
> > +
> > + # sync
> > + # umount /dev/sdb1
> > +
> > +Mount the rootfs partition:
> > +
> > + # mount /dev/sdb2 /mnt/
> > + # tar
> > + # cp <buildroot>/output/images/rootfs.tar -C /mnt/
> > +
> > +Umount the partition
> > +
> > + # sync
> > + # umount /dev/sdb2
> > +
> > +The SD card is ready, you can boot now your Odroid XU-4.
> 
> Please replace all this with a genimage script. It allows you to easily
> describe a FAT and an ext4 partition, and also allows you to place your
> bootloader images at arbitrary offsets.
> 
> See board/freescale/imx6ulevk/genimage.cfg for an example.

sure! It's indeed better!

> > +Automate u-boot commands
> > +------------------------
> > +
> > +In order to avoid customizing u-boot from the u-boot system at boot time, you
> > +can use the boot.cmd file in board/odroid-xu4.
> > +
> > +Jut run
> > +
> > + $ mkimage -A arm -T script -C none -d boot.cmd boot.scr
> 
> Please do this in a post-image script, do that boot.scr is directly
> produced in output/images, and added to the FAT partition by the
> genimage script.
> 
> See board/orangepi/orangepipc/post-build.sh for an example.

I will, thanks!

> > +BR2_arm=y
> > +BR2_cortex_a7=y
> > +BR2_KERNEL_HEADERS_4_6=y
> 
> Please use:
> 
> BR2_PACKAGE_HOST_LINUX_HEADERS_CUSTOM_4_6=y
> 
> which tells Buildroot to use the sources of the kernel being built for
> the kernel headers.

OK.

> > +BR2_LINUX_KERNEL=y
> 
> You need to specify the exact kernel version that you want to build.

OK.

> > +BR2_LINUX_KERNEL_DEFCONFIG="exynos"
> > +BR2_LINUX_KERNEL_DTS_SUPPORT=y
> > +BR2_LINUX_KERNEL_INTREE_DTS_NAME="exynos5422-odroidxu4"
> > +BR2_PACKAGE_ODROID_XU_BL=y
> > +BR2_TARGET_UBOOT=y
> 
> You need to specify the exact U-Boot version that you want to build.
> So, as per my reply on PATCH 1/2, it should probably point to the
> vendor-specific U-Boot version, so that you can use the pre-built
> binaries for the first stage bootloaders.

OK.

> > +BR2_TARGET_UBOOT_BOARDNAME="odroid-xu3"
> 
> Thanks,

Thank you, I will fix the above in the second version of the
patchset.

Andi

[Buildroot] [PATCH 1/2] package: add Odroid BL bootloader binaries

[Thomas Petazzoni]

Hello,

On Tue, 28 Jun 2016 00:52:36 +0900, Andi Shyti wrote:

> It is indeed annoying: I don't like the idea of
> 
>  1. downloading two u-boot
>  2. download u-boot for just two files.
> 
> But, on the other hand, I don't like the hardkernel u-boot
> either. I think it's old, ugly and too hacky; as a buildroot
> user, I would like as much as I can to use mainline software.
> Besides, the cool thing of this board is that it is well
> supported both from the Linux Kernel and u-boot.

OK. Indeed, I can understand the value of using a mainline U-Boot, even
if you have to use the binary blobs for the first stage bootloader.

> How about creating a new repository with just these three files?
> If it sounds good, I will check with the licensing, even though I
> don't thing it will be a problem.

No, we generally don't like to create repositories just for Buildroot.
So please keep your new package, possibly with an explanation in the
Config.in help text as to why it exists (kind of summarizing the
discussion we had).

Thanks a lot!

Thomas
-- 
Thomas Petazzoni, CTO, Free Electrons
Embedded Linux, Kernel and Android engineering
http://free-electrons.com