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>
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>
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@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@openmesh.com>
The GPIO configuration in the DTS have as third parameter the active
low/high configuration. This parameter is not easy to parse by humans when
it is only set to 0/1. It is better to use the predefined constants
GPIO_ACTIVE_HIGH and GPIO_ACTIVE_LOW.
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
The "Devicetree Specification, Release v0.2 - 2.3.4 status" [1] only allows
the "okay" value for an operational device. The "ok" value will be accepted
by the kernel but should be avoided.
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
Sort the soc entries in the dts by address and use dtc labels whenever
possible.
Adjust the DTS files, the OpenMesh A42 is actually an IPQ4018 and not an
IPQ4019.
Signed-off-by: Sven Eckelmann <sven.eckelmann@openmesh.com>
Signed-off-by: Christian Lamparter <chunkeey@gmail.com>
2018-03-14 19:04:51 +01:00
Renamed from target/linux/ipq40xx/files-4.14/arch/arm/boot/dts/qcom-ipq4019-a42.dts (Browse further)
