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-rw-r--r--doc/README.vxworks13
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diff --git a/doc/README.vxworks b/doc/README.vxworks
index 3e08711207..12a0d744d8 100644
--- a/doc/README.vxworks
+++ b/doc/README.vxworks
@@ -2,6 +2,7 @@
#
# Copyright (C) 2013, Miao Yan <miao.yan@windriver.com>
# Copyright (C) 2015-2018, Bin Meng <bmeng.cn@gmail.com>
+# Copyright (C) 2019, Lihua Zhao <lihua.zhao@windriver.com>
VxWorks Support
===============
@@ -24,6 +25,15 @@ From VxWorks 7, VxWorks starts adopting device tree as its hardware description
mechanism (for PowerPC and ARM), thus requiring boot interface changes.
This section will describe the new interface.
+Since VxWorks 7 SR0640 release, VxWorks starts using Linux compatible standard
+DTB for some boards. With that, the exact same bootm flow as used by Linux is
+used, which includes board-specific DTB fix up. To keep backward compatibility,
+only when the least significant bit of flags in bootargs is set, the standard
+DTB will be used. Otherwise it falls back to the legacy bootm flow.
+
+For legacy bootm flow, make sure the least significant bit of flags in bootargs
+is cleared. The calling convention is described below:
+
For PowerPC, the calling convention of the new VxWorks entry point conforms to
the ePAPR standard, which is shown below (see ePAPR for more details):
@@ -33,6 +43,9 @@ For ARM, the calling convention is shown below:
void (*kernel_entry)(void *fdt_addr)
+When using the Linux compatible standard DTB, the calling convention of VxWorks
+entry point is exactly the same as the Linux kernel.
+
When booting a VxWorks 7 kernel (uImage format), the parameters passed to bootm
is like below: