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-rw-r--r--include/configs/sunxi-common.h16
1 files changed, 16 insertions, 0 deletions
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h
index 0b4f0a0..bd7d049 100644
--- a/include/configs/sunxi-common.h
+++ b/include/configs/sunxi-common.h
@@ -13,6 +13,22 @@
#ifndef _SUNXI_COMMON_CONFIG_H
#define _SUNXI_COMMON_CONFIG_H
+#ifdef CONFIG_OLD_SUNXI_KERNEL_COMPAT
+/*
+ * The U-Boot workarounds bugs in the outdated buggy sunxi-3.4 kernels at the
+ * expense of restricting some features, so the regular machine id values can
+ * be used.
+ */
+# define CONFIG_MACH_TYPE_COMPAT_REV 0
+#else
+/*
+ * A compatibility guard to prevent loading outdated buggy sunxi-3.4 kernels.
+ * Only sunxi-3.4 kernels with appropriate fixes applied are able to pass
+ * beyond the machine id check.
+ */
+# define CONFIG_MACH_TYPE_COMPAT_REV 1
+#endif
+
/*
* High Level Configuration Options
*/