mirror of
https://github.com/brain-hackers/u-boot-brain
synced 2024-07-12 14:16:17 +09:00
32f1182926
This board builds an U-Boot binary that is bootable with QEMU's 'virt'
machine on ARM. The minimal QEMU command line is:
qemu-system-arm -machine virt,highmem=off -bios u-boot.bin
(Note that the 'highmem=off' parameter to the 'virt' machine is required for
PCI to work in U-Boot.) This command line enables the following:
- u-boot.bin loaded and executing in the emulated flash at address 0x0
- A generated device tree blob placed at the start of RAM
- A freely configurable amount of RAM, described by the DTB
- A PL011 serial port, discoverable via the DTB
- An ARMv7 architected timer
- PSCI for rebooting the system
- A generic ECAM-based PCI host controller, discoverable via the DTB
Additionally, QEMU allows plugging a bunch of useful peripherals to the PCI bus.
The following ones are supported by both U-Boot and Linux:
- To add a Serial ATA disk via an Intel ICH9 AHCI controller, pass e.g.:
-drive if=none,file=disk.img,id=mydisk -device ich9-ahci,id=ahci -device ide-drive,drive=mydisk,bus=ahci.0
- To add an Intel E1000 network adapter, pass e.g.:
-net nic,model=e1000 -net user
- To add an EHCI-compliant USB host controller, pass e.g.:
-device usb-ehci,id=ehci
- To add a NVMe disk, pass e.g.:
-drive if=none,file=disk.img,id=mydisk -device nvme,drive=mydisk,serial=foo
Signed-off-by: Tuomas Tynkkynen <tuomas.tynkkynen@iki.fi>
59 lines
1.5 KiB
C
59 lines
1.5 KiB
C
/*
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* Copyright (c) 2017 Tuomas Tynkkynen
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*
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* SPDX-License-Identifier: GPL-2.0+
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*/
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#ifndef __CONFIG_H
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#define __CONFIG_H
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#include <linux/sizes.h>
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/* Physical memory map */
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#define CONFIG_SYS_TEXT_BASE 0x00000000
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#define CONFIG_NR_DRAM_BANKS 1
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#define CONFIG_SYS_SDRAM_BASE 0x40000000
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/* The DTB generated by QEMU is placed at start of RAM, stay away from there */
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#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
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#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
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#define CONFIG_SYS_MALLOC_LEN SZ_16M
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/* QEMU's PL011 serial port is detected via FDT using the device model */
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#define CONFIG_PL01X_SERIAL
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/* QEMU implements a 62.5MHz architected timer */
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/* FIXME: can we rely on CNTFREQ instead of hardcoding this fact here? */
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#define CONFIG_SYS_ARCH_TIMER
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#define CONFIG_SYS_HZ 1000
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#define CONFIG_SYS_HZ_CLOCK 62500000
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/* For block devices, QEMU emulates an ICH9 AHCI controller over PCI */
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#define CONFIG_SYS_SCSI_MAX_SCSI_ID 6
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#define CONFIG_SCSI_AHCI
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#define CONFIG_LIBATA
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/* Environment options */
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#define CONFIG_ENV_SIZE SZ_64K
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#include <config_distro_defaults.h>
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#define BOOT_TARGET_DEVICES(func) \
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func(SCSI, scsi, 0)
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#include <config_distro_bootcmd.h>
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#define CONFIG_PREBOOT "pci enum"
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#define CONFIG_EXTRA_ENV_SETTINGS \
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"fdt_high=0xffffffff\0" \
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"initrd_high=0xffffffff\0" \
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"fdt_addr=0x40000000\0" \
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"scriptaddr=0x40200000\0" \
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"pxefile_addr_r=0x40300000\0" \
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"kernel_addr_r=0x40400000\0" \
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"ramdisk_addr_r=0x44000000\0" \
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BOOTENV
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#endif /* __CONFIG_H */
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