linux-kernel - [PATCH v1 1/2] x86/platform/intel-mid: enable 64-bit build

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Date:	Fri, 15 Jan 2016 22:11:07 +0200
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Thomas Gleixner <tglx@...utronix.de>,
	Ingo Molnar <mingo@...hat.com>,
	"H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
	Mika Westerberg <mika.westerberg@...ux.intel.com>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v1 1/2] x86/platform/intel-mid: enable 64-bit build

Intel Tangier SoC is known to have 64-bit dual core CPU. Enable 64-bit build
for it.

The kernel has been tested on Intel Edison board.

Linux buildroot 4.4.0-next-20160115+ #25 SMP Fri Jan 15 22:03:19 EET 2016 x86_64 GNU/Linux

processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 74
model name      : Genuine Intel(R) CPU   4000  @  500MHz
stepping        : 8

Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 arch/x86/Kconfig         | 3 +--
 arch/x86/kernel/head64.c | 8 ++++++++
 2 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index ebb810f..0ebc19a 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -510,11 +510,10 @@ config X86_INTEL_CE
 
 config X86_INTEL_MID
 	bool "Intel MID platform support"
-	depends on X86_32
 	depends on X86_EXTENDED_PLATFORM
 	depends on X86_PLATFORM_DEVICES
 	depends on PCI
-	depends on PCI_GOANY
+	depends on X86_64 || (PCI_GOANY && X86_32)
 	depends on X86_IO_APIC
 	select SFI
 	select I2C
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index f129a9a..2c0f340 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -192,5 +192,13 @@ void __init x86_64_start_reservations(char *real_mode_data)
 
 	reserve_ebda_region();
 
+	switch (boot_params.hdr.hardware_subarch) {
+	case X86_SUBARCH_INTEL_MID:
+		x86_intel_mid_early_setup();
+		break;
+	default:
+		break;
+	}
+
 	start_kernel();
 }
-- 
2.7.0.rc3