From 0d6243283415683dc792ea34fcba885454908836 Mon Sep 17 00:00:00 2001 From: Sven Eckelmann Date: Tue, 17 Apr 2018 14:31:53 +0200 Subject: ipq40xx: Remove unused reserved-memory nodes 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 71ed9f10a33e ("ipq40xx: Use detailed reserved memory for A42") and similar changes. The features which require these regions were mostly unknown but Senthilkumar N L and Sricharan Ramabadhran 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 --- .../linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts | 5 ----- 1 file changed, 5 deletions(-) (limited to 'target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts') diff --git a/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts index d365a7e530..3838f884a8 100644 --- a/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts +++ b/target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4018-a42.dts @@ -30,11 +30,6 @@ #size-cells = <0x1>; ranges; - tz_apps@87b80000 { - reg = <0x87b80000 0x280000>; - no-map; - }; - smem@87e00000 { reg = <0x87e00000 0x080000>; no-map; -- cgit v1.2.3