ARM: Add a new arch + board for QEMU's 'virt' machine
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>
diff --git a/include/configs/qemu-arm.h b/include/configs/qemu-arm.h
new file mode 100644
index 0000000..4376a24
--- /dev/null
+++ b/include/configs/qemu-arm.h
@@ -0,0 +1,58 @@
+/*
+ * Copyright (c) 2017 Tuomas Tynkkynen
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#ifndef __CONFIG_H
+#define __CONFIG_H
+
+#include <linux/sizes.h>
+
+/* Physical memory map */
+#define CONFIG_SYS_TEXT_BASE 0x00000000
+
+#define CONFIG_NR_DRAM_BANKS 1
+#define CONFIG_SYS_SDRAM_BASE 0x40000000
+
+/* The DTB generated by QEMU is placed at start of RAM, stay away from there */
+#define CONFIG_SYS_INIT_SP_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
+#define CONFIG_SYS_LOAD_ADDR (CONFIG_SYS_SDRAM_BASE + SZ_2M)
+#define CONFIG_SYS_MALLOC_LEN SZ_16M
+
+/* QEMU's PL011 serial port is detected via FDT using the device model */
+#define CONFIG_PL01X_SERIAL
+
+/* QEMU implements a 62.5MHz architected timer */
+/* FIXME: can we rely on CNTFREQ instead of hardcoding this fact here? */
+#define CONFIG_SYS_ARCH_TIMER
+#define CONFIG_SYS_HZ 1000
+#define CONFIG_SYS_HZ_CLOCK 62500000
+
+/* For block devices, QEMU emulates an ICH9 AHCI controller over PCI */
+#define CONFIG_SYS_SCSI_MAX_SCSI_ID 6
+#define CONFIG_SCSI_AHCI
+#define CONFIG_LIBATA
+
+/* Environment options */
+#define CONFIG_ENV_SIZE SZ_64K
+
+#include <config_distro_defaults.h>
+
+#define BOOT_TARGET_DEVICES(func) \
+ func(SCSI, scsi, 0)
+
+#include <config_distro_bootcmd.h>
+
+#define CONFIG_PREBOOT "pci enum"
+#define CONFIG_EXTRA_ENV_SETTINGS \
+ "fdt_high=0xffffffff\0" \
+ "initrd_high=0xffffffff\0" \
+ "fdt_addr=0x40000000\0" \
+ "scriptaddr=0x40200000\0" \
+ "pxefile_addr_r=0x40300000\0" \
+ "kernel_addr_r=0x40400000\0" \
+ "ramdisk_addr_r=0x44000000\0" \
+ BOOTENV
+
+#endif /* __CONFIG_H */