Which Khadas SBC do you use?
VIM3
Which system do you use? Android, Ubuntu, OOWOW or others?
ArchLinux ARM (Upstream).
Which version of system do you use? Khadas official images, self built images, or others?
6.2.1-1-aarch64-ARCH #1 SMP PREEMPT_DYNAMIC Sat Feb 25 15:18:35 MST 2023 aarch64 GNU/Linux. (generic Arm64)
Please describe your issue below:
I would like to understand how the reserved values of BL3/ “secmon” is determined for meson-GL2 (VIM3 - A311D).
In the upstream I see this DTS definition:
#address-cells = <2>;
#size-cells = <2>;
ranges;
/* 3 MiB reserved for ARM Trusted Firmware (BL31) */
secmon_reserved: secmon@5000000 {
reg = <0x0 0x05000000 0x0 0x300000>; /* <----------------------- */
no-map;
};
/* 32 MiB reserved for ARM Trusted Firmware (BL32) */
secmon_reserved_bl32: secmon@5300000 {
reg = <0x0 0x05300000 0x0 0x2000000>;
no-map;
};
linux,cma {
compatible = "shared-dma-pool";
reusable;
size = <0x0 0x10000000>;
alignment = <0x0 0x400000>;
linux,cma-default;
};
};
However in the ATF docs, it specifies 4GB for all BLx memories.
Post a console log of your issue below:
I keep getting this exception upon Linux attempting to reserve that memory range
78561 bytes read in 6 ms (12.5 MiB/s)
Retrieving file: /dtbs/amlogic/meson-g12b-a311d-khadas-vim3.dtb.overlay.env
Failed to load '/dtbs/amlogic/meson-g12b-a311d-khadas-vim3.dtb.overlay.env'
Retrieving file: /uEnv.txt
4561 bytes read in 1 ms (4.3 MiB/s)
Import user vars: /uEnv.txt 4561 bytes
append: root=UUID=d722fb7c-5b47-4557-a2b5-2cc56325bb79 rw quiet
Uncompressing Kernel Image
Moving Image from 0x8080000 to 0x8200000, end=abd0000
## Flattened Device Tree blob at 08008000
Booting using the fdt blob at 0x8008000
Loading Ramdisk to 7b7d4000, end 7bf0a5e8 ... OK
Loading Device Tree to 000000007b7bd000, end 000000007b7d32e0 ... OK
Starting kernel ...
[ 0.000000] OF: fdt: Reserved memory: failed to reserve memory for node 'secmon@5000000': base 0x0000000005000000, size 3 MiB # <------------------------
This is the current expected behaviour from the upstream kernel.
When I compare the memory address of the official Fenix Ubuntu 22 and this ArchLinuxArm that I built see these difference in the upper reserved memories:
# From Ubuntu Server 22
khadas@Khadas:~$ sudo cat /proc/iomem
[sudo] password for khadas:
00000000-04ffffff : System RAM
05000000-072fffff : reserved
05000000-052fffff : reserved
07300000-7f806fff : System RAM
11010000-1211ffff : Kernel code
12120000-123fffff : reserved
12400000-126bffff : Kernel data
43400000-7b3fffff : reserved
7b46f000-7b483fff : reserved
7b4eb000-7bf17fff : reserved
7c000000-7e1fffff : reserved
7e21c000-7e31cfff : reserved
7e31d000-7e394fff : reserved
7e397000-7e399fff : reserved
7e39a000-7e3aafff : reserved
7e3ab000-7f806fff : reserved
ff100000-ff11ffff : galcore register region
# From ArchLinux ARM (generic ARM64 upstream)
[alarm@Khadas-VIM3 ~]$ su root
Password:
[root@Khadas-VIM3 alarm]# cat /proc/iomem
00000000-052fffff : System RAM #<--------------- Causes occasional kernel panic because it overlaps with ATF memory.
05000000-052fffff : reserved
05300000-072fffff : reserved
07300000-7f806fff : System RAM
08210000-09efffff : Kernel code
09f00000-0a65ffff : reserved
0a660000-0abcffff : Kernel data
6b400000-7b3fffff : reserved
7b7be000-7b7d1fff : reserved
7b7d4000-7bf0afff : reserved
7d000000-7f1fffff : reserved
7f21a000-7f31afff : reserved
7f31b000-7f398fff : reserved
7f39b000-7f39cfff : reserved
7f39d000-7f39dfff : reserved
7f39e000-7f3aefff : reserved
7f3af000-7f806fff : reserved
ff3f0000-ff3fffff : ff3f0000.ethernet ethernet@ff3f0000
I would like to be pointed in the right direction or docs to understand how these are being determined.
Thanks
