[openwrt/openwrt] ipq40xx: Add reserved memory for WPJ428

[LEDE Commits]

mkresin pushed a commit to openwrt/openwrt.git, branch master:
https://git.lede-project.org/7004f681cd55e3ef38f2c705bd842c627ba45ce7

commit 7004f681cd55e3ef38f2c705bd842c627ba45ce7
Author: Sven Eckelmann <sven.eckelmann at openmesh.com>
AuthorDate: Tue Mar 20 09:04:54 2018 +0100

    ipq40xx: Add reserved memory for WPJ428
    
    The APPSBL and anything after that it not allowed to touch some of the
    memory regions which are used by other components. Still trying to write to
    the memory can lead to sudden device restarts
    
      (IPQ40xx) # mw 87e80000 0
      data abort
      pc : [<873149f8>]          lr : [<87308578>]
      sp : 86edfc28  ip : 86ef4412     fp : 00000000
      r10: 00000000  r9 : 00000000     r8 : 86edff68
      r7 : 00000003  r6 : 8737e624     r5 : 86ef4420  r4 : 8736c154
      r3 : 00000000  r2 : 00000010     r1 : 00000000  r0 : 00000000
      Flags: nZCv  IRQs off  FIQs off  Mode SVC_32
      Resetting CPU ...
    
    The device manufacturer only provided a very rough list of regions:
    
    * rsvd1:     0x87000000 0x500000
    * wifi_dump: 0x87500000 0x600000
    * rsvd2:     0x87b00000 0x500000
    
    A more detailed list for devices using the AP.DK reference design memory
    maps was provided by Roman Yeryomin <roman at advem.lv> in commit 56f2df879fd
    ("ipq806x: ipq4019: add ap-dk01.1-c1 board support"):
    
    * apps_bl:          0x87000000 0x400000
    * sbl:              0x87400000 0x100000
    * cnss_debug:       0x87500000 0x600000
    * cpu_context_dump: 0x87b00000 0x080000
    * tz_apps:          0x87b80000 0x280000
    * smem:             0x87e00000 0x080000
    * tz:               0x87e80000 0x180000
    
    The u-boot function ipq_fdt_mem_rsvd_fixup seems to suggest that only the
    rsvd2 (tz_apps, smem, tz) should be protected. All other regions would have
    been removed by it when CONFIG_QCA_APPSBL_DLOAD is not enabled. This allows
    to reduce the 16MB reserved memory region to only 4.5MB.
    
    Signed-off-by: Sven Eckelmann <sven.eckelmann at openmesh.com>
---
 .../arch/arm/boot/dts/qcom-ipq4028-wpj428.dts       | 21 +++++++++++++++++++++
 1 file changed, 21 insertions(+)

diff --git a/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4028-wpj428.dts b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4028-wpj428.dts
index f9f0f96..88ea370 100644
--- a/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4028-wpj428.dts
+++ b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4028-wpj428.dts
@@ -26,6 +26,27 @@
 	model = "Compex WPJ428";
 	compatible = "compex,wpj428", "qcom,ipq4019";
 
+	reserved-memory {
+		#address-cells = <0x1>;
+		#size-cells = <0x1>;
+		ranges;
+
+		tz_apps at 87b80000 {
+			reg = <0x87b80000 0x280000>;
+			no-map;
+		};
+
+		smem at 87e00000 {
+			reg = <0x87e00000 0x080000>;
+			no-map;
+		};
+
+		tz at 87e80000 {
+			reg = <0x87e80000 0x180000>;
+			no-map;
+		};
+	};
+
 	soc {
 		mdio at 90000 {
 			status = "okay";