[source] x86: add NVMe support for motherboards w/ M.2 slot

[LEDE Commits]

hauke pushed a commit to source.git, branch master:
https://git.lede-project.org/2e237338384847a88362317bd769b1b84242e16c

commit 2e237338384847a88362317bd769b1b84242e16c
Author: Philip Prindeville <philipp at redfish-solutions.com>
AuthorDate: Thu Dec 21 21:10:03 2017 -0700

    x86: add NVMe support for motherboards w/ M.2 slot
    
    A lot of 1U x86_64 servers have NVMe support, which is lower-power
    and higher speed than SSD or CFast drives, etc.  The drivers
    required to make this work are trivial.
    
    Signed-off-by: Philip Prindeville <philipp at redfish-solutions.com>
---
 target/linux/x86/config-4.9 | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/target/linux/x86/config-4.9 b/target/linux/x86/config-4.9
index 402c5fd..b500354 100644
--- a/target/linux/x86/config-4.9
+++ b/target/linux/x86/config-4.9
@@ -49,6 +49,8 @@ CONFIG_ATA_GENERIC=y
 CONFIG_ATA_PIIX=y
 CONFIG_BINFMT_MISC=y
 CONFIG_BLK_DEV_LOOP=y
+CONFIG_BLK_DEV_NVME=y
+# CONFIG_BLK_DEV_NVME_SCSI is not set
 CONFIG_BLK_DEV_SD=y
 CONFIG_BLK_MQ_PCI=y
 CONFIG_BOUNCE=y
@@ -322,6 +324,7 @@ CONFIG_NLS=y
 CONFIG_NO_BOOTMEM=y
 CONFIG_NR_CPUS=1
 # CONFIG_NSC_GPIO is not set
+CONFIG_NVME_CORE=y
 CONFIG_NVRAM=y
 # CONFIG_OF is not set
 CONFIG_OLD_SIGACTION=y