[OE-core][PATCH v2] uboot: Deprecate legacy UBOOT_CONFIG flow

[Ryan Eatmon <reatmon@ti.com>]

Mark the legacy flow for settings the UBOOT_CONFIG options in a comma
separated list.  This code will still work through wrynose, but will be
removed once wrynose is released.

Add warnings to point people in the right direction for fixing their
configs:

WARNING: Legacy use of UBOOT_CONFIG[foo] = "foo_config,foo_image,foo_binary" is deprecated.  Please move to using UBOOT_CONFIG_* variables:
WARNING:     UBOOT_CONFIG[foo] = "foo_config"
WARNING:     UBOOT_CONFIG_IMAGE_FSTYPES[foo] = "foo_image"
WARNING:     UBOOT_CONFIG_BINARY[foo] = "foo_binary"
WARNING: Legacy use of UBOOT_CONFIG[bar] = "bar_config,bar_image" is deprecated.  Please move to using UBOOT_CONFIG_* variables:
WARNING:     UBOOT_CONFIG[bar] = "bar_config"
WARNING:     UBOOT_CONFIG_IMAGE_FSTYPES[bar] = "bar_image"
WARNING: Legacy use of UBOOT_CONFIG[bing] = "bing_config,,bing_binary" is deprecated.  Please move to using UBOOT_CONFIG_* variables:
WARNING:     UBOOT_CONFIG[bing] = "bing_config"
WARNING:     UBOOT_CONFIG_BINARY[bing] = "bing_binary"

Signed-off-by: Ryan Eatmon <reatmon@ti.com>
---
v2: Fix spelling error in comment.

 meta/classes-recipe/uboot-config.bbclass | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/meta/classes-recipe/uboot-config.bbclass b/meta/classes-recipe/uboot-config.bbclass
index 823a66157a..112fea2de4 100644
--- a/meta/classes-recipe/uboot-config.bbclass
+++ b/meta/classes-recipe/uboot-config.bbclass
@@ -27,6 +27,9 @@
 # deemed to be limiting in terms of expanding support to more and more knobs
 # that might need to be turned to customize a config build.
 #
+# NOTE: Suport for this legacy flow is now deprecated and will be removed from
+#       master after the wrynose LTS release.
+#
 # UBOOT_MACHINE = ""
 # UBOOT_CONFIG ??= <default>
 # UBOOT_CONFIG[foo] = "foo_config,images,binary"
@@ -181,14 +184,19 @@ python () {
                 if config == f: 
                     found = True
                     items = v.split(',')
+                    if items[0] and len(items) > 1:
+                        bb.warn('Legacy use of UBOOT_CONFIG[%s] = "%s" is deprecated.  Please move to using UBOOT_CONFIG_* variables:' % (f, v))
+                        bb.warn('    UBOOT_CONFIG[%s] = "%s"' % (f, items[0]))
                     if items[0] and len(items) > 3:
                         raise bb.parse.SkipRecipe('Only config,images,binary can be specified!')
                     d.appendVar('UBOOT_MACHINE', ' ' + items[0])
                     # IMAGE_FSTYPES appending
                     if len(items) > 1 and items[1]:
+                        bb.warn('    UBOOT_CONFIG_IMAGE_FSTYPES[%s] = "%s"' % (f, items[1]))
                         bb.debug(1, "Staging '%s' for IMAGE_FSTYPES." % items[1])
                         imagefstype = items[1]
                     if len(items) > 2 and items[2]:
+                        bb.warn('    UBOOT_CONFIG_BINARY[%s] = "%s"' % (f, items[2]))
                         bb.debug(1, "Staging '%s' for UBOOT_CONFIG_BINARY." % items[2])
                         binary = items[2]
                     break
-- 
2.43.0