kexec & kdump on X96Max_Plus2_T about linux-5.15.y

[mixmid]

armbian login:
[ 234.915496] kvm: exiting hardware virtualization
[ 234.952516] pwrseq_simple sdio-pwrseq: Turning off mmc
[ 234.955323] kexec_core: Starting new kernel
[ 234.971860] Bye!

This part was solved by increasing crashkernel=512M in the kernel command line. See it:

[  347.695632] SMP: stopping secondary CPUs
[  347.699559] Starting crashdump kernel...
[  347.703390] Bye!
[    0.000000] Booting Linux on physical CPU 0x0000000100 [0x411fd050]
[    0.000000] Linux version 5.15.59-mxdbg (root@ed84223eb023) (clang version 14.0.0, LLD 14.0.0) #8 SMP PREEMPT Sun Aug 7 15:40:07 MSK 2022
[    0.000000] random: crng init done
[    0.000000] Machine model: AMedia X96 Max+
[    0.000000] efi: UEFI not found.
[    0.000000] Reserved memory: created CMA memory pool at 0x00000000d0400000, size 256 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[    0.000000] OF: fdt: elfcorehdr is overlapped

Look to kdumps:

root@armbian:/var/crash/202208301753# ls -l
total 45912
-rw------- 1 root root    40843 Aug 30 17:53 dmesg.202208301753
-rw-r--r-- 1 root root 46969389 Aug 30 17:53 dump.202208301753

[mixmid]

[ 20.959437] meson8b-dwmac ff3f0000.ethernet eth0: no phy at addr -1
[ 20.967352] meson8b-dwmac ff3f0000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)
[ 32.808649] meson8b-dwmac ff3f0000.ethernet eth0: no phy at addr -1
[ 32.819560] meson8b-dwmac ff3f0000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)
[ 33.142282] meson8b-dwmac ff3f0000.ethernet eth0: no phy at addr -1
[ 33.163931] meson8b-dwmac ff3f0000.ethernet eth0: stmmac_open: Cannot attach to PHY (error: -19)

was fixed by the string
compatible = "ethernet-phy-id001c.c916", "ethernet-phy-ieee802.3-c22";

&ext_mdio {
	external_phy: ethernet-phy@0 {
		/* 
		 * Realtek RTL8211F (0x001cc916) 
		 * JLSemi JL2101 (0x937c4032)
		 */
		compatible = "ethernet-phy-id001c.c916", "ethernet-phy-ieee802.3-c22";
		reg = <0>;
		max-speed = <1000>;

		reset-assert-us = <30000>;
		reset-deassert-us = <80000>;
		reset-gpios = <&gpio GPIOZ_15 (GPIO_ACTIVE_LOW | GPIO_OPEN_DRAIN)>;

		interrupt-parent = <&gpio_intc>;
		/* MAC_INTR on GPIOZ_14 */
		interrupts = <26 IRQ_TYPE_LEVEL_LOW>;
	};
};