mirror of
https://github.com/openwrt/openwrt.git
synced 2024-12-20 14:13:16 +00:00
c4c2a8f00c
The tz and smem reserved-memory information handled in the upstream Linux sources by the SoC specific dtsi and not by the the boards dts. Using the same approach in OpenWrt avoids unneccessary duplication. Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
89 lines
3.0 KiB
Diff
89 lines
3.0 KiB
Diff
From fc566294610fa49e9d8c31c4ecc9c82f49b11f59 Mon Sep 17 00:00:00 2001
|
|
From: Sven Eckelmann <sven.eckelmann@openmesh.com>
|
|
Date: Wed, 18 Apr 2018 09:10:44 +0200
|
|
Subject: [PATCH] ARM: dts: ipq4019: Add TZ and SMEM reserved regions
|
|
|
|
The QSEE (trustzone) is started on IPQ4019 before Linux is started.
|
|
According to QCA, it is placed in in the the memory region
|
|
0x87e80000-0x88000000 and must not be accessed directly. There is an
|
|
additional memory region 0x87e00000-0x87E80000 smem which which can be used
|
|
for communication with the TZ. The driver for the latter is not yet ready
|
|
but it is still not allowed to use this memory region like any other
|
|
memory region.
|
|
|
|
Not reserving this memory region either leads to kernel crashes, kernel
|
|
hangs (often during the boot) or bus errors for userspace programs. The
|
|
latter happens when a program is using a memory region which is mapped to
|
|
these physical memory regions.
|
|
|
|
[ 571.758058] Unhandled fault: imprecise external abort (0xc06) at 0x01715ff8
|
|
[ 571.758099] pgd = cebec000
|
|
[ 571.763826] [01715ff8] *pgd=8e7fa835, *pte=87e7f75f, *ppte=87e7fc7f
|
|
Bus error
|
|
|
|
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
|
|
|
|
Forwarded: https://patchwork.kernel.org/patch/10347459/
|
|
---
|
|
Cc: Sricharan Ramabadhran <srichara@qti.qualcomm.com>
|
|
Cc: Senthilkumar N L <snlakshm@qti.qualcomm.com>
|
|
|
|
There are additional memory regions which have to be initialized first by
|
|
Linux. So they are currently not used. We were told by QCA that the
|
|
features QSDK uses them for are:
|
|
|
|
* crash dump feature
|
|
- a couple of regions used when 'qca,scm_restart_reason' dt node has the
|
|
value 'dload_status' not set to 1
|
|
+ apps_bl <0x87000000 0x400000>
|
|
+ sbl <0x87400000 0x100000>
|
|
+ cnss_debug <0x87400000 0x100000>
|
|
+ cpu_context_dump <0x87b00000 0x080000>
|
|
- required driver not available in Linux
|
|
- safe to remove
|
|
* QSEE app execution
|
|
- region tz_apps <0x87b80000 0x280000>
|
|
- required driver not available in Linux
|
|
- safe to remove
|
|
* communication with TZ/QSEE
|
|
- region smem <0x87b80000 0x280000>
|
|
- driver changes not yet upstreamed
|
|
- must not be removed because any access can crash kernel/program
|
|
* trustzone (QSEE) private memory
|
|
- region tz <0x87e80000 0x180000>
|
|
- must not be removed because any access can crash kernel/program
|
|
|
|
The problem with the missing regions was reported in 2016 [1]. So maybe
|
|
this change qualifies for a stable@vger.kernel.org submission.
|
|
|
|
[1] https://www.spinics.net/lists/linux-arm-msm/msg21536.html
|
|
---
|
|
arch/arm/boot/dts/qcom-ipq4019.dtsi | 16 ++++++++++++++++
|
|
1 file changed, 16 insertions(+)
|
|
|
|
--- a/arch/arm/boot/dts/qcom-ipq4019.dtsi
|
|
+++ b/arch/arm/boot/dts/qcom-ipq4019.dtsi
|
|
@@ -23,6 +23,22 @@
|
|
compatible = "qcom,ipq4019";
|
|
interrupt-parent = <&intc>;
|
|
|
|
+ reserved-memory {
|
|
+ #address-cells = <0x1>;
|
|
+ #size-cells = <0x1>;
|
|
+ ranges;
|
|
+
|
|
+ smem_region: smem@87e00000 {
|
|
+ reg = <0x87e00000 0x080000>;
|
|
+ no-map;
|
|
+ };
|
|
+
|
|
+ tz@87e80000 {
|
|
+ reg = <0x87e80000 0x180000>;
|
|
+ no-map;
|
|
+ };
|
|
+ };
|
|
+
|
|
aliases {
|
|
spi0 = &spi_0;
|
|
spi1 = &spi_1;
|