mirror of
https://github.com/AsahiLinux/u-boot
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2b41e19cc5
When building U-Boot we select the architecture via Kconfig and not ARCH being passed in via the environment or make cmdline. Cc: Adam Ford <aford173@gmail.com> Cc: Vanessa Maegima <vanessa.maegima@nxp.com> Cc: Otavio Salvador <otavio@ossystems.com.br> Cc: Igor Opaniuk <igor.opaniuk@toradex.com> Cc: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org> Signed-off-by: Tom Rini <trini@konsulko.com>
126 lines
3.6 KiB
ReStructuredText
126 lines
3.6 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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Colibri iMX7
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============
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Quick Start
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-----------
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- Build U-Boot
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- NAND IMX image adjustments before flashing
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- Flashing manually U-Boot to eMMC
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- Flashing manually U-Boot to NAND
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- Using ``update_uboot`` script
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Build U-Boot
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------------
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.. code-block:: bash
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$ export CROSS_COMPILE=arm-linux-gnueabi-
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$ make colibri_imx7_emmc_defconfig # For NAND: colibri_imx7_defconfig
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$ make
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After build succeeds, you will obtain final ``u-boot-dtb.imx`` IMX specific
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image, ready for flashing (but check next section for additional
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adjustments).
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Final IMX program image includes (section ``6.6.7`` from `IMX7DRM
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<https://www.nxp.com/webapp/Download?colCode=IMX7DRM>`_):
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* **Image vector table** (IVT) for BootROM
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* **Boot data** -indicates the program image location, program image size
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in bytes, and the plugin flag.
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* **Device configuration data**
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* **User image**: U-Boot image (``u-boot-dtb.bin``)
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IMX image adjustments prior to flashing
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---------------------------------------
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1. U-Boot for both Colibri iMX7 NAND and eMMC versions
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is built with HABv4 support (`AN4581.pdf
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<https://www.nxp.com/docs/en/application-note/AN4581.pdf>`_)
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enabled by default, which requires to generate a proper
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Command Sequence File (CSF) by srktool from NXP (not included in the
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U-Boot tree, check additional details in introduction_habv4.txt)
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and concatenate it to the final ``u-boot-dtb.imx``.
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2. In case if you don't want to generate a proper ``CSF`` (for any reason),
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you still need to pad the IMX image so i has the same size as specified in
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in **Boot Data** section of IMX image.
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To obtain this value, run:
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.. code-block:: bash
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$ od -X -N 0x30 u-boot-dtb.imx
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0000000 402000d1 87800000 00000000 877ff42c
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0000020 877ff420 877ff400 878a5000 00000000
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^^^^^^^^
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0000040 877ff000 000a8060 00000000 40b401d2
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^^^^^^^^ ^^^^^^^^
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Where:
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* ``877ff400`` - IVT self address
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* ``877ff000`` - Program image address
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* ``000a8060`` - Program image size
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To calculate the padding:
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* IVT offset = ``0x877ff400`` - ``0x877ff000`` = ``0x400``
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* Program image size = ``0xa8060`` - ``0x400`` = ``0xa7c60``
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and then pad the image:
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.. code-block:: bash
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$ objcopy -I binary -O binary --pad-to 0xa7c60 --gap-fill=0x00 \
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u-boot-dtb.imx u-boot-dtb.imx.zero-padded
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3. Also, according to requirement from ``6.6.7.1``, the final image
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should have ``0x400`` offset for initial IVT table.
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For eMMC setup we handle this by flashing it to ``0x400``, howewer
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for NAND setup we adjust the image prior to flashing, adding padding in the
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beginning of the image.
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.. code-block:: bash
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$ dd if=u-boot-dtb.imx.zero-padded of=u-boot-dtb.imx.ready bs=1024 seek=1
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Flash U-Boot IMX image to eMMC
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------------------------------
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Flash the ``u-boot-dtb.imx.zero-padded`` binary to the primary eMMC hardware
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boot area partition:
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.. code-block:: bash
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=> load mmc 1:1 $loadaddr u-boot-dtb.imx.zero-padded
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=> setexpr blkcnt ${filesize} + 0x1ff && setexpr blkcnt ${blkcnt} / 0x200
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=> mmc dev 0 1
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=> mmc write ${loadaddr} 0x2 ${blkcnt}
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Flash U-Boot IMX image to NAND
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------------------------------
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.. code-block:: bash
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=> load mmc 1:1 $loadaddr u-boot-dtb.imx.ready
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=> nand erase.part u-boot1
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=> nand write ${loadaddr} u-boot1 ${filesize}
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=> nand erase.part u-boot2
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=> nand write ${loadaddr} u-boot2 ${filesize}
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Using update_uboot script
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-------------------------
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You can also usb U-Boot env update_uboot script,
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which wraps all eMMC/NAND specific command invocation:
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.. code-block:: bash
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=> load mmc 1:1 $loadaddr u-boot-dtb.imx.ready
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=> run update_uboot
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