Xen ARM with Virtualization Extensions/OMAP5432 uEVM
The OMAP5432 uEVM board is now supported in Xen upstream.
1. Prepare U-boot
Xen hypervisor requires to be booted in HYP mode by the bootloader. Make sure that the U-boot you use would keep staying in HYP mode when switching the control to Xen.
2. Build Xen and Linux Dom0
2.1 Build Xen hypervisor
Build Xen:
# git clone git://xenbits.xen.org/xen.git # cd xen # make dist-xen XEN_TARGET_ARCH=arm32 CROSS_COMPILE=arm-linux-gnueabihf- CONFIG_EARLY_PRINTK=omap5432
Create uImage for Xen:
# mkimage -A arm -T kernel -a 0x80200000 -e 0x80200000 -C none -d "xen/xen" xen-uImage
2.2 Build Linux Dom0 kernel
Get the linux kernel source from upstream:
# git clone git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
Use the default ‘omap2plus' as the base config:
# make omap2plus_defconfig ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
Before adding the XEN related kernel configs, disable old omap SoCs support by unselecting the TI OMAP2/3/4 in the ‘System Type’ section of kernel configuration menus (by running ‘make menuconfig ARCH=arm’).
Adding the following config entries in .config and run ‘make olddefconfig ARCH=arm’:
CONFIG_XEN_DOM0=y CONFIG_XEN=y CONFIG_XEN_BLKDEV_FRONTEND=y CONFIG_XEN_BLKDEV_BACKEND=y CONFIG_XEN_NETDEV_FRONTEND=y CONFIG_XEN_NETDEV_BACKEND=y CONFIG_INPUT_XEN_KBDDEV_FRONTEND=y CONFIG_HVC_XEN=y CONFIG_HVC_XEN_FRONTEND=y CONFIG_XEN_DEV_EVTCHN=y CONFIG_XEN_BACKEND=y CONFIG_XENFS=y CONFIG_XEN_COMPAT_XENFS=y CONFIG_XEN_SYS_HYPERVISOR=y CONFIG_XEN_XENBUS_FRONTEND=y CONFIG_XEN_GNTDEV=y CONFIG_XEN_GRANT_DEV_ALLOC=y CONFIG_XEN_PRIVCMD=y
OMAP kernel still uses hwmod to describe its on-chip hardware blocks. Thus, we need to disable the UART3 used by Xen serial console by directly modifying the kernel source.
diff --git a/arch/arm/mach-omap2/omap_hwmod_54xx_data.c b/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
index 8923172..29e2b68 100644
--- a/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
+++ b/arch/arm/mach-omap2/omap_hwmod_54xx_data.c
@@ -2474,7 +2474,9 @@ static struct omap_hwmod_ocp_if *omap54xx_hwmod_ocp_ifs[] __initdata = {
&omap54xx_l4_per__timer11,
&omap54xx_l4_per__uart1,
&omap54xx_l4_per__uart2,
+#if 0
&omap54xx_l4_per__uart3,
+#endif
&omap54xx_l4_per__uart4,
&omap54xx_l4_per__uart5,
&omap54xx_l4_per__uart6,
Build the kernel:
# make zImage ARCH=arm CROSS_COMPILE=arm-linux-gnueabihf-
2.3 Build FDT
Apply the patch below to the upstream linux kernel and build the device tree blob.
diff --git a/arch/arm/boot/dts/omap5-uevm.dts b/arch/arm/boot/dts/omap5-uevm.dts
index 3b99ec2..d6de98a 100644
--- a/arch/arm/boot/dts/omap5-uevm.dts
+++ b/arch/arm/boot/dts/omap5-uevm.dts
@@ -15,6 +15,27 @@
model = "TI OMAP5 uEVM board";
compatible = "ti,omap5-uevm", "ti,omap5";
+ chosen {
+ bootargs = "dom0_mem=256M console=dtuart dtuart=serial2 earlyprintk=xen";
+ xen,dom0-bootargs = "console=hvc0,115200n8 earlyprintk=xen debug ignore_loglevel root=/dev/mmcblk0p2 rw rootwait fixrtc";
+ modules {
+ #address-cells = <1>;
+ #size-cells = <1>;
+
+ module@0 {
+ compatible = "xen,linux-zimage", "xen,multiboot-module";
+ reg = <0xa0000000 0xa00000>;
+ };
+ };
+ };
+
+ psci {
+ compatible = "arm,psci";
+ method = "smc";
+ cpu_off = <1>;
+ cpu_on = <2>;
+ };
+
memory {
device_type = "memory";
reg = <0x80000000 0x7F000000>; /* 2032 MB */
@@ -199,7 +220,7 @@
};
&mmc1 {
- vmmc-supply = <&ldo9_reg>;
+ vmmc-supply = <&vmmcsd_fixed>;
bus-width = <4>;
};
@@ -214,14 +235,6 @@
ti,non-removable;
};
-&mmc4 {
- status = "disabled";
-};
-
-&mmc5 {
- status = "disabled";
-};
-
&i2c1 {
pinctrl-names = "default";
pinctrl-0 = <&i2c1_pins>;
@@ -436,10 +449,6 @@
clock-frequency = <400000>;
};
-&mcbsp3 {
- status = "disabled";
-};
-
&usbhshost {
port2-mode = "ehci-hsic";
port3-mode = "ehci-hsic";
diff --git a/arch/arm/boot/dts/omap5.dtsi b/arch/arm/boot/dts/omap5.dtsi
index f8c9855..82d91ba 100644
--- a/arch/arm/boot/dts/omap5.dtsi
+++ b/arch/arm/boot/dts/omap5.dtsi
@@ -80,6 +80,7 @@
<GIC_PPI 14 (GIC_CPU_MASK_RAW(3) | IRQ_TYPE_LEVEL_LOW)>,
<GIC_PPI 11 (GIC_CPU_MASK_RAW(3) | IRQ_TYPE_LEVEL_LOW)>,
<GIC_PPI 10 (GIC_CPU_MASK_RAW(3) | IRQ_TYPE_LEVEL_LOW)>;
+ clock-frequency = <6144000>;
};
gic: interrupt-controller@48211000 {
@@ -90,6 +91,7 @@
<0x48212000 0x1000>,
<0x48214000 0x2000>,
<0x48216000 0x2000>;
+ interrupts = <1 9 0xf04>;
};
/*
@@ -582,7 +584,6 @@
ti,hwmods = "dmic";
dmas = <&sdma 67>;
dma-names = "up_link";
- status = "disabled";
};
mcbsp1: mcbsp@40122000 {
@@ -597,7 +598,6 @@
dmas = <&sdma 33>,
<&sdma 34>;
dma-names = "tx", "rx";
- status = "disabled";
};
mcbsp2: mcbsp@40124000 {
@@ -612,7 +612,6 @@
dmas = <&sdma 17>,
<&sdma 18>;
dma-names = "tx", "rx";
- status = "disabled";
};
mcbsp3: mcbsp@40126000 {
@@ -627,7 +626,6 @@
dmas = <&sdma 19>,
<&sdma 20>;
dma-names = "tx", "rx";
- status = "disabled";
};
timer1: timer@4ae18000 {
2.4 All together
Now we should have 3 files as following:
- xen-uImage
- zImage
- omap5-uevm.dtb
Then copy all these 3 files to the /boot partition of your MICRO-SD card.
3. Boot Xen and Dom0
Use the following U-boot command sequence to boot Xen & dom0:
OMAP5430 EVM # fatload mmc 0:1 0x825f0000 omap5-uevm.dtb OMAP5430 EVM # fatload mmc 0:1 0x90000000 xen-uImage OMAP5430 EVM # fatload mmc 0:1 0xa0000000 zImage OMAP5430 EVM # bootm 0x90000000 - 0x825f0000
