package/boot/uboot-layerscape/patches/0065-docs-fsl-ppa-Add-documentation-for-PPA-trusted-FW.patch

   1 From 39f95bb22c03b18ac6c4ef1b4485414dd4a303cb Mon Sep 17 00:00:00 2001
   2 From: Abhimanyu Saini <abhimanyu.saini@nxp.com>
   3 Date: Fri, 24 Jun 2016 14:37:42 +0530
   4 Subject: [PATCH 65/93] docs: fsl-ppa: Add documentation for PPA trusted FW
   5
   6 Signed-off-by: Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
   7 Signed-off-by: Abhimanyu Saini <abhimanyu.saini@nxp.com>
   8 ---
   9  doc/README.fsl-ppa |   26 ++++++++++++++++++++++++++
  10  1 file changed, 26 insertions(+)
  11  create mode 100644 doc/README.fsl-ppa
  12
  13 diff --git a/doc/README.fsl-ppa b/doc/README.fsl-ppa
  14 new file mode 100644
  15 index 0000000..76cd01f
  16 --- /dev/null
  17 +++ b/doc/README.fsl-ppa
  18 @@ -0,0 +1,26 @@
  19 +PPA FW for U-boot
  20 +
  21 +Summary
  22 +=======
  23 +PPA is a trusted firmware for ARMv8 , that handles smc calls from lower
  24 +exception levels, like power state co-ordination interface call or
  25 +smc calls to trusted OS from the Linux kernel.
  26 +
  27 +Notes
  28 +=====
  29 +
  30 +1. Currenly, u-boot run at the highest exception level processor
  31 +   supported, which is EL3 in case of ARMv8, if PPA FW is incorporated
  32 +   U-boot copies it to secure location in DDR.
  33 +2. During init U-boot passes control to PPA FW and before returning
  34 +   the core jumps to EL2.
  35 +
  36 +Using PPA
  37 +=========
  38 +1. Ensure CONFIG_FSL_LS_PPA is set for your platform
  39 +2. Program PPA binary on address CONFIG_SYS_LS_PPA_FW_ADDR on flash
  40 +
  41 +Contributors
  42 +============
  43 +   Hou Zhiqiang <Zhiqiang.Hou@nxp.com>
  44 +   Abhimanyu Saini <abhimanyu.saini@nxp.com>
  45 --
  46 1.7.9.5
  47