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Posted to commits@nuttx.apache.org by xi...@apache.org on 2022/07/14 06:58:06 UTC
[incubator-nuttx] 05/05: esp32-devkitc: Add knsh configuration to the Documentation page
This is an automated email from the ASF dual-hosted git repository.
xiaoxiang pushed a commit to branch master
in repository https://gitbox.apache.org/repos/asf/incubator-nuttx.git
commit feca57ffa9c5a92186409569f849c246319047f4
Author: Gustavo Henrique Nihei <gu...@espressif.com>
AuthorDate: Wed Jul 13 10:08:16 2022 -0300
esp32-devkitc: Add knsh configuration to the Documentation page
Signed-off-by: Gustavo Henrique Nihei <gu...@espressif.com>
---
.../xtensa/esp32/boards/esp32-devkitc/index.rst | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/Documentation/platforms/xtensa/esp32/boards/esp32-devkitc/index.rst b/Documentation/platforms/xtensa/esp32/boards/esp32-devkitc/index.rst
index a5d09ef0ff..db01f6e0b2 100644
--- a/Documentation/platforms/xtensa/esp32/boards/esp32-devkitc/index.rst
+++ b/Documentation/platforms/xtensa/esp32/boards/esp32-devkitc/index.rst
@@ -115,6 +115,28 @@ nsh
Basic NuttShell configuration (console enabled in UART0, exposed via
USB connection by means of CP2102 converter, at 115200 bps).
+knsh
+----
+
+This is identical to the nsh configuration except that (1) NuttX
+is built as PROTECTED mode, monolithic module and the user applications
+are built separately and, as a consequence, (2) some features that are
+only available in the FLAT build are disabled.
+
+Protected Mode support for ESP32 relies on the PID Controller peripheral
+for implementing isolation between Kernel and Userspace.
+
+By working together with the MMU and Static MPUs of the ESP32, the PID
+Controller is able to restrict the application access to peripherals, on-chip
+memories (Internal ROM and Internal SRAM) and off-chip memories (External
+Flash and PSRAM).
+
+.. warning::
+ * The PID Controller driver is in **EXPERIMENTAL** state, so please
+ consider the Protected Mode feature for ESP32 a **Proof-of-Concept**.
+ * The PID Controller **does not** prevent the application from accessing
+ CPU System Registers.
+
wapi
----