mirror of
https://github.com/AsahiLinux/u-boot
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77 lines
2.3 KiB
ReStructuredText
77 lines
2.3 KiB
ReStructuredText
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.. SPDX-License-Identifier: GPL-2.0+
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Renesas RZ/N1
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=============
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Building
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--------
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This document describes how to build and flash U-Boot for the RZ/N1.
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U-Boot
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^^^^^^
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Clone the U-Boot repository and build it as follows:
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.. code-block:: bash
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git clone --depth 1 https://source.denx.de/u-boot/u-boot.git
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cd u-boot
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make rzn1_snarc_defconfig
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make CROSS_COMPILE=arm-linux-gnu-
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This produces `u-boot` which is an ELF executable, suitable for use with `gdb`
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and JTAG debugging tools.
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It also produceds `u-boot.bin` which is a raw binary.
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Binman
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^^^^^^
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The BootROM in the RZ/N1 SoC expects to find the boot image in SPKG format.
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This format is documented in Chapter 7.4 of the RZ/N1 User Manual.
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The `binman` tool may be used to generate the SPKG format for booting.
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See tools/binman/binman.rst for details on this tool and its pre-requisites.
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.. code-block:: bash
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binman -d arch/arm/dts/r9a06g032-rzn1-snarc.dtb -o <OUT>
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This will produce `u-boot.bin.spkg` in the specified <OUT> directory. It can
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then be flashed into QSPI, NAND, or loaded via USB-DFU mode.
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SPKG image
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^^^^^^^^^^
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Alternatively, the same SPKG image can be built by calling `mkimage` as follows:
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.. code-block:: bash
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tools/mkimage -n board/schneider/rzn1-snarc/spkgimage.cfg \
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-T spkgimage -a 0x20040000 -e 0x20040000 \
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-d u-boot.bin u-boot.bin.spkg
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This produces `u-boot.bin.spkg` which can be flashed into QSPI, NAND, or loaded
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via USB-DFU mode.
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Take note of the load and execution address, which are encoded into the SPKG
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headers. For development convenience, mkimage computes the execution offset
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(part of the SPKG header) by subtracting the supplied load address from the
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supplied execution address.
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Also note there are other parameters, notably ECC configuration in the case of
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boot from NAND, specified in the `spkgimage.cfg` configuration file.
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Flashing
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--------
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The RZ/N1 is able to boot from QSPI, NAND, or via USB (DFU). In all cases the
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on-board BootROM expects for the binary to be wrapped with a "SPKG" header.
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It is possible to recover a bricked unit by using the USB (DFU) boot mode. This
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allows uploading U-Boot into the internal RAM. Thereafter U-Boot can be used to
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program the QSPI and/or NAND, making use of U-Boot dfu mode.
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Otherwise the only other option for recovery is via JTAG.
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