@@ -1,14 +1,13 @@
.. SPDX-License-Identifier: GPL-2.0+
-U-Boot for Radxa Zero
-=====================
+U-Boot for Radxa Zero (S905Y2)
+==============================
-Radxa Zero is a small form factor SBC based on the Amlogic S905Y2
-chipset that ships in a number of RAM/eMMC configurations:
+Radxa Zero is a small form factor SBC based on the Amlogic S905Y2 chipset that ships in
+a number of RAM/eMMC configurations:
-Boards with 512MB/1GB LPDDR4 RAM have no eMMC storage and BCM43436
-wireless (2.4GHz b/g/n) while 2GB/4GB boards have 8/16/32/64/128GB
-eMMC storage and BCM4345 wireless (2.4/5GHz a/b/g/n/ac).
+512MB/1GB LPDDR4 RAM boards have no eMMC and BCM43436 wireless (2.4GHz b/g/n) while the
+2GB/4GB boards have 8/16/32/64/128GB eMMC and BCM4345 wireless (2.4/5GHz a/b/g/n/ac).
- Amlogic S905Y2 quad-core Cortex-A53
- Mali G31-MP2 GPU
@@ -18,11 +17,9 @@ eMMC storage and BCM4345 wireless (2.4/5GHz a/b/g/n/ac).
- 1x micro SD Card slot
- 40 Pin GPIO header
-Schematics are available on the manufacturer website:
+Schematics are available on the manufacturer website: https://dl.radxa.com/zero/docs/hw
-https://dl.radxa.com/zero/docs/hw/RADAX_ZERO_V13_SCH_20210309.pdf
-
-U-Boot compilation
+U-Boot Compilation
------------------
.. code-block:: bash
@@ -31,14 +28,20 @@ U-Boot compilation
$ make radxa-zero_defconfig
$ make
-Image creation
---------------
+U-Boot Signing with Pre-Built FIP repo
+--------------------------------------
+
+.. code-block:: bash
+ $ git clone https://github.com/LibreELEC/amlogic-boot-fip --depth=1
+ $ cd amlogic-boot-fip
+ $ mkdir my-output-dir
+ $ ./build-fip.sh radxa-zero /path/to/u-boot/u-boot.bin my-output-dir
-For simplified usage, pleaser refer to :doc:`pre-generated-fip` with codename `radxa-zero`
+U-Boot Manual Signing
+---------------------
-Amlogic does not provide sources for the firmware and for tools needed
-to create the bootloader image, so it is necessary to obtain them from
-git trees published by the board vendor:
+Amlogic does not provide sources for the firmware and tools needed to create a bootloader
+image so it is necessary to obtain binaries from sources published by the board vendor:
.. code-block:: bash
@@ -61,16 +64,16 @@ git trees published by the board vendor:
$ cd ../fip/radxa-zero
$ make
-This will generate:
+This will generate the signed U-Boot binaries:
.. code-block:: bash
$ u-boot.bin u-boot.bin.sd.bin u-boot.bin.usb.bl2 u-boot.bin.usb.tpl
-Then write the image to SD with:
+Then write U-Boot to SD or eMMC with:
.. code-block:: bash
- $ DEV=/dev/your_sd_device
+ $ DEV=/dev/boot_device
$ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=512 skip=1 seek=1
- $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=444
+ $ dd if=fip/u-boot.bin.sd.bin of=$DEV conv=fsync,notrunc bs=1 count=440
Improve documentation. Signed-off-by: Christian Hewitt <christianshewitt@gmail.com> --- doc/board/amlogic/radxa-zero.rst | 45 +++++++++++++++++--------------- 1 file changed, 24 insertions(+), 21 deletions(-)