[U-Boot] [PATCH] ARM: enable ARMv7 virt support for the Arndale board

[Christoffer Dall <christoffer.dall@linaro.org>]

From: Andre Przywara <andre.przywara@linaro.org>

To enable hypervisors utilizing the ARMv7 virtualization extension
on the Arndale board, add the simple SMP pen address writer function
and add the required configuration variables to switch all cores to
HYP mode before launching the OS.
This allows booting KVM and Xen directly from u-boot.

Reviewed-by: Christoffer Dall <christoffer.dall@linaro.org>
Signed-off-by: Andre Przywara <andre.przywara@linaro.org>
---

Note that Andre previously reported a board reset on initial boot with
this patch, but I have applied this patch on upstream master of U-Boot
and tested on two separate Arndale boards and it boots perfectly fine
and lets you use KVM, so I recommend taking this patch as is.

 board/samsung/arndale/arndale.c | 10 ++++++++++
 include/configs/arndale.h       |  8 ++++++++
 2 files changed, 18 insertions(+)

diff --git a/board/samsung/arndale/arndale.c b/board/samsung/arndale/arndale.c
index ef88314..83fd3bd 100644
--- a/board/samsung/arndale/arndale.c
+++ b/board/samsung/arndale/arndale.c
@@ -117,3 +117,13 @@ int checkboard(void)
 	return 0;
 }
 #endif
+
+#ifdef CONFIG_S5P_PA_SYSRAM
+void smp_set_core_boot_addr(unsigned long addr, int corenr)
+{
+	writel(addr, CONFIG_S5P_PA_SYSRAM);
+
+	/* make sure this write is really executed */
+	__asm__ volatile ("dsb\n");
+}
+#endif
diff --git a/include/configs/arndale.h b/include/configs/arndale.h
index 64b54ab..75f9933 100644
--- a/include/configs/arndale.h
+++ b/include/configs/arndale.h
@@ -250,4 +250,12 @@
 /* Enable Time Command */
 #define CONFIG_CMD_TIME
 
+#define CONFIG_S5P_PA_SYSRAM	0x02020000
+#define CONFIG_SMP_PEN_ADDR	CONFIG_S5P_PA_SYSRAM
+
+/* The PERIPHBASE in the CBAR register is wrong on the Arndale, so override it */
+#define CONFIG_ARM_GIC_BASE_ADDRESS	0x10480000
+
+#define CONFIG_ARMV7_VIRT
+
 #endif	/* __CONFIG_H */
-- 
1.8.5.2