imx8qxpc0 remoteproc booting fw image fail due to NULL pointer panic

[yellow_huang]

On imx8qxpc0-mek platform, just use NXP official preburn image - LF_v5.10.52-2.1.0_images_IMX8QXPC0MEK(https://www.nxp.com/webapp/Download?colCode=L5.10.52_2.1.0_MX8QXPC0&appType=license) to boot up CM4 from linux throughput remoteproc framework, but FAIL.

The panic log show as below, and full log also attached to review:

```txt

root@imx8qxpc0mek:/lib/firmware# echo start >/sys/class/remoteproc/remoteproc1/state

[ 113.686559] remoteproc remoteproc1: powering up imx-rproc

[ 113.694968] remoteproc remoteproc1: Booting fw image imx8qx_m4_TCM_rpmsg_lite_str_echo_rtos.elf, size 193480

[ 113.705233] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [ 113.714115] Mem abort info: [ 113.716940] ESR = 0x86000004

[ 113.720018] EC = 0x21: IABT (current EL), IL = 32 bits

[ 113.725389] SET = 0, FnV = 0 [ 113.728480] EA = 0, S1PTW = 0

[ 113.731652] user pgtable: 4k pages, 48-bit VAs, pgdp=000000088673d000

[ 113.738141] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000

[ 113.744974] Internal error: Oops: 86000004 [#1] PREEMPT SMP

[ 113.750547] Modules linked in: fsl_jr_uio caam_jr caamkeyblob_desc caamhash_desc caamalg_desc crypto_engine rng_core authenc libdes crct10dif_ce flexcan can_dev mxc_jpeg_encdec imx8_media_dev(C) caam error fuse

[ 113.769308] CPU: 2 PID: 623 Comm: sh Tainted: G C 5.10.52-lts-5.10.y+ga11753a89ec6 #1

[ 113.778441] Hardware name: Freescale i.MX8QXP MEK (DT)

[ 113.783588] pstate: 40000005 (nZcv daif -PAN -UAO -TCO BTYPE=--)

[ 113.789602] pc : 0x0 [ 113.791792] lr : rproc_elf_load_segments+0x16c/0x23c

[ 113.796754] sp : ffff800012aa3b60 [ 113.800074] x29: ffff800012aa3b60 x28: 0000000000000a00

[ 113.805399] x27: ffff000801bd9000 x26: 0000000000010000

[ 113.810715] x25: ffff800025581000 x24: 0000000000000020

[ 113.816032] x23: 0000000000000003 x22: 0000000000000001
[ 113.821349] x21: 0000000000000000 x20: 0000000000000a00
[ 113.826665] x19: ffff800025571034 x18: 0000000000000020
[ 113.831982] x17: 0000000000000000 x16: 0000000000000000
[ 113.837308] x15: ffff0008078120f8 x14: 1ffe0c1d1ffe0c1d
[ 113.842634] x13: 1ffe0c1d1ffe0c1d x12: 1ffe0c1d1ffe0c1d
[ 113.847959] x11: 1ffe0c1d1ffe0c1d x10: 1ffe0c1d1ffe0c1d

[ 113.853275] x9 : 1ffe0c1d1ffe0c1d x8 : 1ffe0c1d1ffe0c1d

[ 113.858592] x7 : 1ffe0c1d1ffe0c1d x6 : ffff800025620a00

[ 113.863907] x5 : 0000000000000000 x4 : ffff800025620000 [ 113.869225] x3 : 0000000000000a00 x2 : ffff800025581000

[ 113.874542] x1 : ffff800025620000 x0 : ffff000801bd9000

[ 113.879868] Call trace:

[ 113.882320] 0x0

[ 113.884163] imx_rproc_elf_load_segments+0x24/0x40

[ 113.888958] rproc_start+0x30/0x168

[ 113.892450] rproc_boot+0x340/0x4e0

[ 113.895942] state_store+0x50/0xf0

[ 113.899351] dev_attr_store+0x1c/0x30

[ 113.903017] sysfs_kf_write+0x48/0x60

[ 113.906682] kernfs_fop_write_iter+0x118/0x1ac

[ 113.911129] new_sync_write+0xe8/0x180

[ 113.914881] vfs_write+0x244/0x2a4

[ 113.918288] ksys_write+0x6c/0x100

[ 113.921693] __arm64_sys_write+0x20/0x30

[ 113.925622] el0_svc_common.constprop.0+0x78/0x1a0

[ 113.930412] do_el0_svc+0x24/0x90

[ 113.933734] el0_svc+0x14/0x20

[ 113.936790] el0_sync_handler+0x1a4/0x1b0

[ 113.940805] el0_sync+0x180/0x1c0

[ 113.944129] Code: bad PC value

[ 113.947191] ---[ end trace dd9902760959338a ]--- ^GMessage from syslogd@ at Thu Jan 1 00:01:37 1970 ... : Internal error: Oop NXP i.MX Release Distro 5.10-hardknott imx8qxpc0mek ttyLP0

```

And, also some abnormal kernel messages about CM4, Is there any dependency on this issue?

```

...

[ 0.000000] OF: fdt: Reserved memory: failed to reserve memory for node 'm4@0x88000000': base 0x0000000088000000, size 128 MiB

...

[ 3.052322] imx-rproc imx8x_cm4@0: mbox_request_channel_byname() could not locate channel named "txdb" [ 3.054567] sdhci-esdhc-imx 5b020000.mmc: voltage-ranges unspecified
[ 3.063880] imx-rproc imx8x_cm4@0: No txdb, ret -22
[ 3.064792] remoteproc remoteproc1: imx-rproc is available

....

```

Any comments