Dev/BeagleBone/BBB/From Scratch - Revision history

Drizzt at 19:11, 16 October 2019

2019-10-16T19:11:27Z

@@ Line 23: / Line 23: @@
   make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Build/uboot/ -j 8
   cp ../Build/uboot/MLO ../Build/uboot/u-boot.img ../Build/results/
 You need both binaries as the BeagleBone Black processor (Texas Instrument AM335x), in SD card boot mode, will look for a file named "MLO", which must fit on the only available memory at this point : the instruction cache (128k minus 19k reserved for boot rom).
@@ Line 31: / Line 29: @@
 When always booting in the same known configuration it is possible to avoid the second stage u-boot and change the MLO configuration to look for a fixed name Linux kernel image and device tree and immediately load and run these instead.
 === Configuration ===
 Create the file ../Build/results/uEnv.txt<br />
 An example file can be found in the [http://data.nathael.net/Dev/BeagleBone/BBB/ results.tar.bz2 archive] on my server.
 == Linux Kernel ==
@@ Line 74: / Line 76: @@
 === Device Tree ===
 Refer to "Build device tree blob" in the previous section.
 === Firmwares ===
@@ Line 81: / Line 85: @@
   wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O ../results/lib/firmware/am335x-pm-firmware.bin
 The resulting binaries are part of the [http://data.nathael.net/Dev/BeagleBone/BBB/ results.tar.bz2 archive] on my server.
 == SD Card creation ==
 == Rootfs ==

Drizzt at 16:48, 16 October 2019

2019-10-16T16:48:55Z

← Older revision		Revision as of 18:48, 16 October 2019
Line 1:		Line 1:
	== u-boot ==		== u-boot ==
	Full [processors.wiki.ti.com/index.php/AM335x_U-Boot_User's_Guide AM335x U-Boot User's Guide] on ti wiki.		Full [http://processors.wiki.ti.com/index.php/AM335x_U-Boot_User's_Guide AM335x U-Boot User's Guide] on ti wiki.

	=== Grab the sources ===		=== Grab the sources ===
Line 51:		Line 51:
	Optional (creates a new local branch) :		Optional (creates a new local branch) :
	git checkout -b new_branch		git checkout -b new_branch

			Patched sources can be recovered on my server : [http://data.nathael.net/Dev/BeagleBone/BBB/ linux_***.tar.bz2].

	=== Compilation ===		=== Compilation ===
Line 78:		Line 80:
	Still required ??		Still required ??
	wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O ../results/lib/firmware/am335x-pm-firmware.bin		wget http://arago-project.org/git/projects/?p=am33x-cm3.git\;a=blob_plain\;f=bin/am335x-pm-firmware.bin\;hb=HEAD -O ../results/lib/firmware/am335x-pm-firmware.bin

			The resulting binaries are part of the [http://data.nathael.net/Dev/BeagleBone/BBB/ results.tar.bz2 archive] on my server.

	== SD Card creation ==		== SD Card creation ==

Drizzt: /* Rootfs */

2019-10-16T16:06:46Z

Rootfs

← Older revision		Revision as of 18:06, 16 October 2019
Line 82:		Line 82:

	== Rootfs ==		== Rootfs ==
			This board uses an ARM processor with hardfloat support, thus the root filesystem should be built using "arm-linux-gnueabihf-" cross-toolchain or use the armhf architecture for Devuan or other Debian based distribution.

			Refer to [[Dev/Embedded/Rootfs\|the rootfs creation page]] for more information.
			You should find a base Devuan rootfs here : [http://data.nathael.net/Dev/BeagleBone/BBB/ rootfs_devuan_ceres_armhf_***.tar.bz2].

Drizzt: /* Linux Kernel */

2019-10-16T16:05:48Z

Linux Kernel

@@ Line 40: / Line 40: @@
 == Linux Kernel ==
 == SD Card creation ==
 == Rootfs ==

Drizzt: Created page with "== u-boot == Full [processors.wiki.ti.com/index.php/AM335x_U-Boot_User's_Guide AM335x U-Boot User's Guide] on ti wiki. === Grab the sources === git clone git://git.denx.de/u..."

2019-10-16T15:30:20Z

Created page with "== u-boot == Full [processors.wiki.ti.com/index.php/AM335x_U-Boot_User's_Guide AM335x U-Boot User's Guide] on ti wiki. === Grab the sources === git clone git://git.denx.de/u..."

New page

== u-boot ==
Full [processors.wiki.ti.com/index.php/AM335x_U-Boot_User's_Guide AM335x U-Boot User's Guide] on ti wiki.

=== Grab the sources ===
git clone git://git.denx.de/u-boot.git
cd u-boot/
git checkout v2017.03
Optional :
git checkout -b new_branch
: (Replace "new_branch" with the name of your choice !)
Patches:
wget https://raw.github.com/eewiki/u-boot-patches/master/v2013.10/0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch
patch -p1 < 0001-am335x_evm-uEnv.txt-bootz-n-fixes.patch

Patched sources can be recovered on my server : [http://data.nathael.net/Dev/BeagleBone/BBB/ uboot_***.tar.bz2].

=== Compile ===
Configure and Build:
mkdir -p ../Build/uboot/ ../Build/results/
rm -rf ../Build/uboot/*
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Build/uboot/ distclean
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Build/uboot/ am335x_boneblack_defconfig
make ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf- O=../Build/uboot/ -j 8
cp ../Build/uboot/MLO ../Build/uboot/u-boot.img ../Build/results/

The resulting binaries are part of the [http://data.nathael.net/Dev/BeagleBone/BBB/ results.tar.bz2 archive] on my server.

You need both binaries as the BeagleBone Black processor (Texas Instrument AM335x), in SD card boot mode, will look for a file named "MLO", which must fit on the only available memory at this point : the instruction cache (128k minus 19k reserved for boot rom).

MLO stand for "Memory Locator" and is a "Secondary Program Loader (SPL)". It is in fact a reduced "1st stage" u-boot image, which in turns looks for a file named "u-boot.img" which the "2nd stage" uboot.

When always booting in the same known configuration it is possible to avoid the second stage u-boot and change the MLO configuration to look for a fixed name Linux kernel image and device tree and immediately load and run these instead.

=== Use ===
The MLO file must be on the first partition of the µSD card, which must be formated as FAT32 and flaged as bootable.

=== Configuration ===
Create the file ../Build/results/uEnv.txt<br />
An example file can be found in the [http://data.nathael.net/Dev/BeagleBone/BBB/ results.tar.bz2 archive] on my server.

== Linux Kernel ==

== SD Card creation ==

== Rootfs ==