yocto-bsp: add custom kernel support

Add a template to support custom kernels via a custom kernel recipe
derived from linux-yocto-custom.bb.

(From meta-yocto rev: 98c7861ebdd40b1fc4d803701ad9fb979be54273)

Signed-off-by: Tom Zanussi <tom.zanussi@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/kernel-list.noinstall

@@ -0,0 +1,26 @@
+{{ if kernel_choice == "custom": }}
+{{ input type:"boolean" name:"custom_kernel_remote" prio:"20" msg:"Is the custom kernel you'd like to use in a remote git repo? (y/n)" default:"y"}}
+
+{{ if kernel_choice == "custom" and custom_kernel_remote == "y": }}
+{{ input type:"edit-git-repo" name:"custom_kernel_remote_path" prio:"20" msg:"Please enter the full URI to the remote git repo (the default corresponds to linux-stable v3.4.21)" default:"git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git"}}
+
+{{ if kernel_choice == "custom" and custom_kernel_remote == "n": }}
+{{ input type:"edit-git-repo" name:"custom_kernel_local_path" prio:"20" msg:"You've indicated that you're not using a remote git repo.  Please enter the full path to the local git repo you want to use (the default assumes a local linux-stable v3.4.21)" default:"/home/trz/yocto/kernels/linux-stable.git"}}
+
+{{ if kernel_choice == "custom": }}
+{{ input type:"boolean" name:"custom_kernel_need_kbranch" prio:"20" msg:"Do you need to use a specific (non-master) branch? (y/n)" default:"n"}}
+
+{{ if kernel_choice == "custom" and custom_kernel_need_kbranch == "y": }}
+{{ input type:"edit" name:"custom_kernel_kbranch" prio:"20" msg:"Please enter the branch you want to use (the default branch corresponds to the linux-stable 'linux-3.4.y' branch):" default:"linux-3.4.y"}}
+
+{{ if kernel_choice == "custom": }}
+{{ input type:"edit" name:"custom_kernel_srcrev" prio:"20" msg:"Please enter the SRCREV (commit id) you'd like to use (use '${AUTOREV}' to track the current HEAD):" default:"${AUTOREV}"}}
+
+{{ if kernel_choice == "custom": }}
+{{ input type:"edit" name:"custom_kernel_linux_version" prio:"20" msg:"Please enter the Linux version of the kernel you've specified:" default:"3.4.21"}}
+
+{{ if kernel_choice == "custom": }}
+{{ input type:"edit" name:"custom_kernel_linux_version_extension" prio:"20" msg:"Please enter a Linux version extension if you want (it will show up at the end of the kernel name shown by uname):" default:"-custom"}}
+
+{{ if kernel_choice == "custom": }}
+{{ input type:"edit-file" name:"custom_kernel_defconfig" prio:"20" msg:"It's recommended (but not required) that custom kernels be built using a defconfig.  Please enter the full path to the defconfig for your kernel (NOTE: if you don't specify a defconfig the kernel probably won't build or boot):" default:""}}

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom.bb

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+# This file was derived from the linux-yocto-custom.bb recipe in
+# oe-core.
+#
+# linux-yocto-custom.bb:
+#
+#   A yocto-bsp-generated kernel recipe that uses the linux-yocto and
+#   oe-core kernel classes to apply a subset of yocto kernel
+#   management to git managed kernel repositories.
+#
+# Warning:
+#
+#   Building this kernel without providing a defconfig or BSP
+#   configuration will result in build or boot errors. This is not a
+#   bug.
+#
+# Notes:
+#
+#   patches: patches can be merged into to the source git tree itself,
+#            added via the SRC_URI, or controlled via a BSP
+#            configuration.
+#
+#   example configuration addition:
+#            SRC_URI += "file://smp.cfg"
+#   example patch addition:
+#            SRC_URI += "file://0001-linux-version-tweak.patch
+#   example feature addition:
+#            SRC_URI += "file://feature.scc"
+#
+
+inherit kernel
+require recipes-kernel/linux/linux-yocto.inc
+
+{{ if kernel_choice == "custom" and custom_kernel_remote == "y": }}
+SRC_URI = "{{=custom_kernel_remote_path}};protocol=git;bareclone=1"
+{{ if kernel_choice == "custom" and custom_kernel_remote == "n": }}
+SRC_URI = "git://{{=custom_kernel_local_path}};protocol=file;bareclone=1"
+
+SRC_URI += "file://defconfig"
+
+SRC_URI += "file://{{=machine}}.scc \
+            file://{{=machine}}.cfg \
+            file://user-config.cfg \
+            file://user-patches.scc \
+           "
+
+{{ if kernel_choice == "custom" and custom_kernel_need_kbranch == "y" and custom_kernel_kbranch and custom_kernel_kbranch != "master": }}
+KBRANCH = "{{=custom_kernel_kbranch}}"
+
+LINUX_VERSION ?= "{{=custom_kernel_linux_version}}"
+LINUX_VERSION_EXTENSION ?= "{{=custom_kernel_linux_version_extension}}"
+
+SRCREV="{{=custom_kernel_srcrev}}"
+
+PR = "r0"
+PV = "${LINUX_VERSION}+git${SRCPV}"
+
+COMPATIBLE_MACHINE_{{=machine}} = "{{=machine}}"

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom/defconfig

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+#
+# Placeholder for custom default kernel configuration.  yocto-bsp will
+# replace this file with a user-specified defconfig.
+#

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom/user-config.cfg

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+#
+# Used by yocto-kernel to manage config options.
+#
+# yocto-kernel may change the contents of this file in any
+# way it sees fit, including removing comments like this,
+# so don't manually make any modifications you don't want
+# to lose.
+#

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom/user-patches.scc

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+#
+# Used by yocto-kernel to manage patches.
+#
+# yocto-kernel may change the contents of this file in any
+# way it sees fit, including removing comments like this,
+# so don't manually make any modifications you don't want
+# to lose.
+#

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom/{{=machine}}.cfg

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+#
+# A convenient place to add config options, nothing more.
+#

scripts/lib/bsp/substrate/target/arch/common/recipes-kernel/linux/{{ if kernel_choice == "custom": }} linux-yocto-custom/{{=machine}}.scc

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+#
+# The top-level 'feature' for the {{=machine}} custom kernel.
+#
+# Essentially this is a convenient top-level container or starting
+# point for adding lower-level config fragements and features.
+#
+
+# {{=machine}}.cfg in the linux-yocto-custom subdir is just a
+# convenient place for adding random config fragments.
+
+kconf hardware {{=machine}}.cfg
+
+# These are used by yocto-kernel to add config fragments and features.
+# Don't remove if you plan on using yocto-kernel with this BSP.
+
+kconf hardware user-config.cfg
+include user-patches.scc