48 lines
1.4 KiB
Diff
48 lines
1.4 KiB
Diff
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From 39f95bb22c03b18ac6c4ef1b4485414dd4a303cb Mon Sep 17 00:00:00 2001
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From: Abhimanyu Saini <abhimanyu.saini@nxp.com>
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Date: Fri, 24 Jun 2016 14:37:42 +0530
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Subject: [PATCH 65/93] docs: fsl-ppa: Add documentation for PPA trusted FW
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Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
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Signed-off-by: Abhimanyu Saini <abhimanyu.saini@nxp.com>
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---
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doc/README.fsl-ppa | 26 ++++++++++++++++++++++++++
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1 file changed, 26 insertions(+)
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create mode 100644 doc/README.fsl-ppa
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diff --git a/doc/README.fsl-ppa b/doc/README.fsl-ppa
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new file mode 100644
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index 0000000..76cd01f
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--- /dev/null
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+++ b/doc/README.fsl-ppa
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@@ -0,0 +1,26 @@
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+PPA FW for U-boot
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+
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+Summary
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+=======
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+PPA is a trusted firmware for ARMv8 , that handles smc calls from lower
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+exception levels, like power state co-ordination interface call or
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+smc calls to trusted OS from the Linux kernel.
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+
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+Notes
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+=====
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+
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+1. Currenly, u-boot run at the highest exception level processor
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+ supported, which is EL3 in case of ARMv8, if PPA FW is incorporated
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+ U-boot copies it to secure location in DDR.
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+2. During init U-boot passes control to PPA FW and before returning
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+ the core jumps to EL2.
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+
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+Using PPA
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+=========
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+1. Ensure CONFIG_FSL_LS_PPA is set for your platform
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+2. Program PPA binary on address CONFIG_SYS_LS_PPA_FW_ADDR on flash
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+
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+Contributors
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+============
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+ Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
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+ Abhimanyu Saini <abhimanyu.saini@nxp.com>
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--
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1.7.9.5
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