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ipq40xx: Remove unused reserved-memory nodes

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The reserved-memory regions are mostly undocumented by QCA and are named
very unspecific in the QSDK device trees. It was tried to clean them up by
commit 71ed9f10a3 ("ipq40xx: Use detailed reserved memory for A42") and
similar changes.

The features which require these regions were mostly unknown but
Senthilkumar N L <snlakshm@qti.qualcomm.com> and Sricharan Ramabadhran
<srichara@qti.qualcomm.com> provided some more insight in some of them:

* 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

Removing the unnecessary regions saves some kilobyte of reserved-memory and
cleans up the device tree:

* 2560 KiB
  - 8devices Jalapeno
  - AVM FRITZ!Box 4040
  - Compex WPJ428
  - Meraki MR33 Access Point
  - OpenMesh A42
* 14336 KiB
  - GL.iNet GL-B1300
  - Qualcomm Technologies, Inc. IPQ40xx/AP-DK01.1-C1

Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
This commit is contained in:
Sven Eckelmann 2018-04-17 14:31:53 +02:00 committed by Mathias Kresin
parent 74a0d8cd92
commit 0d62432834
7 changed files with 1 additions and 76 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts
View file

@ -30,11 +30,6 @@
#size-cells = <0x1>;
ranges;
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
no-map;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

5
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-fritz4040.dts
View file

@ -36,11 +36,6 @@
#size-cells = <0x1>;
ranges;
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
reusable;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

5
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-jalapeno.dts
View file

@ -30,11 +30,6 @@
#size-cells = <0x1>;
ranges;
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
no-map;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

5
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4028-wpj428.dts
View file

@ -31,11 +31,6 @@
#size-cells = <0x1>;
ranges;
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
no-map;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

25
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4029-gl-b1300.dts
View file

@ -40,31 +40,6 @@
#size-cells = <0x1>;
ranges;
apps_bl@87000000 {
reg = <0x87000000 0x400000>;
no-map;
};
sbl@87400000 {
reg = <0x87400000 0x100000>;
no-map;
};
cnss_debug@87500000 {
reg = <0x87500000 0x600000>;
no-map;
};
cpu_context_dump@87b00000 {
reg = <0x87b00000 0x080000>;
no-map;
};
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
no-map;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

5
target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4029-mr33.dts
View file

@ -39,11 +39,6 @@
#size-cells = <0x1>;
ranges;
tz_apps@87b80000 {
reg = <0x87b80000 0x280000>;
reusable;
};
smem@87e00000 {
reg = <0x87e00000 0x080000>;
no-map;

27
target/linux/ipq40xx/patches-4.14/864-07-dts-ipq4019-ap-dk01.1-c1-add-spi-and-ram-nodes.patch
View file

@ -1,6 +1,6 @@
--- a/arch/arm/boot/dts/qcom-ipq4019-ap.dk01.1-c1.dts
+++ b/arch/arm/boot/dts/qcom-ipq4019-ap.dk01.1-c1.dts
@@ -19,4 +19,112 @@
@@ -19,4 +19,87 @@
/ {
model = "Qualcomm Technologies, Inc. IPQ40xx/AP-DK01.1-C1";
@ -14,31 +14,6 @@
+ #size-cells = <0x1>;
+ ranges;
+
+ apps_bl@87000000 {
+ reg = <0x87000000 0x400000>;
+ no-map;
+ };
+
+ sbl@87400000 {
+ reg = <0x87400000 0x100000>;
+ no-map;
+ };
+
+ cnss_debug@87500000 {
+ reg = <0x87500000 0x600000>;
+ no-map;
+ };
+
+ cpu_context_dump@87b00000 {
+ reg = <0x87b00000 0x080000>;
+ no-map;
+ };
+
+ tz_apps@87b80000 {
+ reg = <0x87b80000 0x280000>;
+ no-map;
+ };
+
+ smem@87e00000 {
+ reg = <0x87e00000 0x080000>;
+ no-map;