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Update description to use the MIPS Malta board for Qemu. Signed-off-by: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
130 lines
3.4 KiB
ReStructuredText
130 lines
3.4 KiB
ReStructuredText
.. SPDX-License-Identifier: GPL-2.0+
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.. sectionauthor:: Daniel Schwierzeck <daniel.schwierzeck@gmail.com>
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QEMU MIPS
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=========
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Qemu for MIPS is based on the MIPS Malta board. The built Malta U-Boot
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images can be used for Qemu and on physical hardware. The Malta board
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supports all combinations of Little and Big Endian as well as 32 bit
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and 64 bit.
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Limitations & comments
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----------------------
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The memory size for Qemu is hard-coded to 256 MiB. For Malta Little Endian
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targets an extra endianness swapped image named *u-boot-swap.bin* is
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generated and required for Qemu.
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Example usage
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-------------
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Build for 32 bit, big endian:
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.. code-block:: bash
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make malta_defconfig
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make
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UBOOT_BIN=u-boot.bin
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QEMU_BIN=qemu-system-mips
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QEMU_CPU=24Kc
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Build for 32 bit, little endian:
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.. code-block:: bash
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make maltael_defconfig
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make
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UBOOT_BIN=u-boot-swap.bin
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QEMU_BIN=qemu-system-mipsel
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QEMU_CPU=24Kc
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Build for 64 bit, big endian:
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.. code-block:: bash
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make malta64_defconfig
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make
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UBOOT_BIN=u-boot.bin
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QEMU_BIN=qemu-system-mips64
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QEMU_CPU=MIPS64R2-generic
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Build for 64 bit, little endian:
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.. code-block:: bash
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make malta64el_defconfig
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make
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UBOOT_BIN=u-boot-swap.bin
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QEMU_BIN=qemu-system-mips64el
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QEMU_CPU=MIPS64R2-generic
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Generate NOR flash image with U-Boot binary:
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.. code-block:: bash
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dd if=/dev/zero bs=1M count=4 | tr '\000' '\377' > pflash.img
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dd if=${UBOOT_BIN} of=pflash.img conv=notrunc
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Start Qemu:
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.. code-block:: bash
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mkdir tftproot
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${QEMU_BIN} -nographic -cpu ${QEMU_CPU} -m 256 -drive if=pflash,file="$(pwd)/pflash.img",format=raw -netdev user,id=net0,tftp="$(pwd)/tftproot" -device pcnet,netdev=net0
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.. code-block:: bash
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U-Boot 2021.04-00963-g60279a2b1d (Apr 21 2021 - 19:54:32 +0200)
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Board: MIPS Malta CoreLV
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DRAM: 256 MiB
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Flash: 4 MiB
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Loading Environment from Flash... *** Warning - bad CRC, using default environment
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In: serial@3f8
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Out: serial@3f8
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Err: serial@3f8
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Net: pcnet#0
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IDE: Bus 0: not available
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maltael #
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How to debug U-Boot
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-------------------
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In order to debug U-Boot you need to start qemu with gdb server support (-s)
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and waiting the connection to start the CPU (-S). Start Qemu in the first console:
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.. code-block:: bash
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mkdir tftproot
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${QEMU_BIN} -s -S -nographic -cpu ${QEMU_CPU} -m 256 -drive if=pflash,file="$(pwd)/pflash.img",format=raw -netdev user,id=net0,tftp="$(pwd)/tftproot" -device pcnet,netdev=net0
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In the second console start gdb:
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.. code-block:: bash
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gdb-multiarch --eval-command "target remote :1234" u-boot
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.. code-block:: bash
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GNU gdb (Ubuntu 9.2-0ubuntu1~20.04) 9.2
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Copyright (C) 2020 Free Software Foundation, Inc.
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License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>
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This is free software: you are free to change and redistribute it.
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There is NO WARRANTY, to the extent permitted by law.
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Type "show copying" and "show warranty" for details.
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This GDB was configured as "x86_64-linux-gnu".
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Type "show configuration" for configuration details.
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For bug reporting instructions, please see:
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<http://www.gnu.org/software/gdb/bugs/>.
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Find the GDB manual and other documentation resources online at:
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<http://www.gnu.org/software/gdb/documentation/>.
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For help, type "help".
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Type "apropos word" to search for commands related to "word"...
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Reading symbols from u-boot...
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Remote debugging using :1234
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0xbfc00000 in ?? ()
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(gdb) c
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Continuing.
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