root@imx8mq-evk:~# hciattach /dev/ttymxc2 bcm43xx
[  555.760711] imx-uart 30880000.serial: We cannot prepare for the RX slave dma!
bcm43xx_init
[  555.792236] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000
[  555.801034] Mem abort info:
[  555.803827]   ESR = 0x0000000096000044
[  555.807576]   EC = 0x25: DABT (current EL), IL = 32 bits
[  555.812888]   SET = 0, FnV = 0
[  555.815940]   EA = 0, S1PTW = 0
[  555.819080]   FSC = 0x04: level 0 translation fault
[  555.823955] Data abort info:
[  555.826833]   ISV = 0, ISS = 0x00000044
[  555.830666]   CM = 0, WnR = 1
[  555.833632] user pgtable: 4k pages, 48-bit VAs, pgdp=0000000048c59000
[  555.840071] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000
[  555.846863] Internal error: Oops: 96000044 [#1] PREEMPT SMP
[  555.852434] Modules linked in: bnep can_raw can cfg80211 iptable_nat nf_nat nf_conntrack nf_defrag_ipv6 nf_defrag_ipv4 libcrc32c iptable_mangle iptable_filter bluetooth ecdh_generic ecc vcan fsl_jr_uio caam_jr caamkeyblob_desc caamhas
[  555.895080] CPU: 0 PID: 0 Comm: swapper/0 Tainted: G           O      5.15.87-5.15.87-2.2.0+g0eb4504bd3b8 #1
[  555.904907] Hardware name: NXP i.MX8MQ EVK (DT)
[  555.909437] pstate: 800000c5 (Nzcv daIF -PAN -UAO -TCO -DIT -SSBS BTYPE=--)
[  555.916398] pc : sdma_transfer_init+0x114/0x240
[  555.920934] lr : sdma_transfer_init+0xc8/0x240
[  555.925377] sp : ffff800008003d50
[  555.928689] x29: ffff800008003d50 x28: 0000000000000000 x27: ffff000004b446b0
[  555.935828] x26: ffff00001ccb1800 x25: 00000000000002ed x24: 00000000000000c0
[  555.942966] x23: 0000000000000000 x22: ffff80000a1f5200 x21: 0000000000000140
[  555.950106] x20: ffff000004b40080 x19: ffff000004b41528 x18: 0000000000000000
[  555.957245] x17: ffff8000b3d9a000 x16: ffff800008004000 x15: 0000000000004000
[  555.964386] x14: 0000000000000200 x13: 0000000000000001 x12: 0000000000002000
[  555.971523] x11: 0000000000000040 x10: 00000000ffffffff x9 : 0000000000000000
[  555.978663] x8 : ffff80000a1f5280 x7 : 0000000000000000 x6 : 000000000000003f
[  555.985802] x5 : 0000000000000040 x4 : 0000000000000000 x3 : 0000000000000004
[  555.992940] x2 : 0000000000000000 x1 : 0000000000000000 x0 : 0000000001830020
[  556.000080] Call trace:
[  556.002525]  sdma_transfer_init+0x114/0x240
[  556.006708]  sdma_prep_slave_sg+0x7c/0x2c0
[  556.010806]  imx_uart_dma_tx+0xdc/0x230
[  556.014644]  imx_uart_start_tx+0x10c/0x1f4
[  556.018741]  uart_handle_cts_change+0x78/0x84
[  556.023098]  imx_uart_int+0x1b8/0x260
[  556.026761]  __handle_irq_event_percpu+0x5c/0x240
[  556.031469]  handle_irq_event+0x64/0x140
[  556.035393]  handle_fasteoi_irq+0xa4/0x1f4
[  556.039490]  handle_domain_irq+0x60/0x90
[  556.043415]  gic_handle_irq+0x54/0x130
[  556.047166]  call_on_irq_stack+0x28/0x5c
[  556.051090]  do_interrupt_handler+0x54/0x60
[  556.055275]  el1_interrupt+0x30/0x80
[  556.058852]  el1h_64_irq_handler+0x18/0x24
[  556.062949]  el1h_64_irq+0x78/0x7c
[  556.066351]  cpuidle_enter_state+0xb4/0x3c0
[  556.070538]  cpuidle_enter+0x38/0x50
[  556.074116]  do_idle+0x210/0x2a0
[  556.077343]  cpu_startup_entry+0x28/0x80
[  556.081266]  rest_init+0xe4/0xf4
[  556.084495]  arch_call_rest_init+0x10/0x1c
[  556.088595]  start_kernel+0x670/0x6b0
[  556.092257]  __primary_switched+0xbc/0xc4
[  556.096272] Code: b90026c0 52800400 531b6ab5 72a03060 (b90002e0)
[  556.102368] ---[ end trace 9b073b435a74ee2b ]---
[  556.106984] Kernel panic - not syncing: Oops: Fatal exception in interrupt
[  556.113857] SMP: stopping secondary CPUs
[  557.077779] SMP: failed to stop secondary CPUs 0,3
[  557.082572] Kernel Offset: disabled
[  557.086057] CPU features: 0x00002001,20000846
[  557.090412] Memory Limit: none
[  557.093467] ---[ end Kernel panic - not syncing: Oops: Fatal exception in interrupt ]---