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