path: root/docs/firmware-design.rst
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authorSoby Mathew <soby.mathew@arm.com>2018-06-11 16:40:36 +0100
committerSoby Mathew <soby.mathew@arm.com>2018-06-26 15:55:46 +0100
commit3208edcdfe5046333bd9d7e39d26e72de44fdf28 (patch)
treebb84f6bc6e96621a8f61f81ec4182f9f9c03ad7b /docs/firmware-design.rst
parentf790cc0a9c492cf3615c82574e2c3f1ff8af0a3d (diff)
ARM platforms: Initialize cntfrq for BL1 Firmware update
Currenly the CNTFRQ register and system timer is initialized in BL31 for use by the normal world. During firmware update, the NS-BL1 or NS-BL2U may need to access the system timer. Hence this patch duplicates the CNTFRQ and system timer initialization in BL1 as well. Signed-off-by: Soby Mathew <soby.mathew@arm.com> Change-Id: I1ede78b4ae64080fb418cb93f3e48b26d7b724dc
Diffstat (limited to 'docs/firmware-design.rst')
1 files changed, 2 insertions, 0 deletions
diff --git a/docs/firmware-design.rst b/docs/firmware-design.rst
index e3500c27b0..8aa7622783 100644
--- a/docs/firmware-design.rst
+++ b/docs/firmware-design.rst
@@ -306,6 +306,8 @@ On Arm platforms, BL1 performs the following platform initializations:
- If the BL1 dynamic configuration file, ``TB_FW_CONFIG``, is available, then
load it to the platform defined address and make it available to BL2 via
+- Configure the system timer and program the `CNTFRQ_EL0` for use by NS-BL1U
+ and NS-BL2U firmware update images.
Firmware Update detection and execution