I am using an AM62Ax, AM62x, or AM64x device. My part number has fewer A53 cores than the maximum number of A53 cores in that part family (see below for specific part numbers). Or, my part number does NOT have a GPU core, in a part family that can have GPU cores (e.g., AM623x, AM620x).
During Linux boot, I am running into an error like this:
[ 17.491528] Internal error: synchronous external abort: 96000010 [#1] PREEMPT SMP [ 17.499023] Modules linked in: dwc3_am62(+) rti_wdt(+) virtio_rpmsg_bus ti_k3_m4_remoteproc snd_soc_tlv320aic26 sa2ul pruss sha512_generic authenc cdns_dphy ltc2945 at24 sch_fq_codel cryptodev(O) ipv6 [ 17.516894] CPU: 1 PID: 219 Comm: systemd-udevd Tainted: G O 5.10.168-yocto-standard #1 [ 17.526191] Hardware name: Critical Link MitySOM-AM62x (DT) [ 17.531760] pstate: 80000005 (Nzcv daif -PAN -UAO -TCO BTYPE=--) [ 17.537772] pc : rti_wdt_probe+0x1e8/0x4f0 [rti_wdt] [ 17.542738] lr : rti_wdt_probe+0x1d8/0x4f0 [rti_wdt] [ 17.547693] sp : ffff800011c5b920 [ 17.550999] x29: ffff800011c5b920 x28: 0000000000000100 [ 17.556309] x27: ffff80001011c1a8 x26: 0000000000000003 [ 17.561615] x25: ffff800011603d98 x24: 000000000000004a [ 17.566923] x23: ffff00000467a920 x22: ffff000002423400 [ 17.572231] x21: ffff00000467a890 x20: ffff000002423410 [ 17.577539] x19: ffff00000467a880 x18: 0000000000000000 [ 17.582848] x17: 0000000000000000 x16: 0000000000000000 [ 17.588155] x15: 0000000000000000 x14: ffff000005c0d580 [ 17.593463] x13: 0000000000000000 x12: ffff8000117dd000 [ 17.598769] x11: ffff8000117d7000 x10: 0000000000001000 [ 17.604078] x9 : ffff80001075c0fc x8 : ffff8000114c2b7c [ 17.609389] x7 : 0000000000000041 x6 : 000000000000008b [ 17.614697] x5 : 000000000e021000 x4 : ffff000002423610 [ 17.620005] x3 : ffff000005e5cd00 x2 : 0000000000000000 [ 17.625312] x1 : ffff000005c0b900 x0 : ffff8000117d5090 [ 17.630620] Call trace: [ 17.633071] rti_wdt_probe+0x1e8/0x4f0 [rti_wdt] [ 17.637691] platform_drv_probe+0x5c/0xb0 [ 17.641695] really_probe+0xf4/0x408 [ 17.645266] driver_probe_device+0x60/0xc0 [ 17.649357] device_driver_attach+0x7c/0x88 [ 17.653533] __driver_attach+0x70/0x100 [ 17.657362] bus_for_each_dev+0x78/0xc8 [ 17.661192] driver_attach+0x2c/0x38 [ 17.664762] bus_add_driver+0x15c/0x210 [ 17.668592] driver_register+0x6c/0x128 [ 17.672423] __platform_driver_register+0x50/0x60 [ 17.677124] rti_wdt_driver_init+0x2c/0x1000 [rti_wdt] [ 17.682260] do_one_initcall+0x4c/0x2e0 [ 17.686094] do_init_module+0x50/0x210 [ 17.689838] load_module+0x20fc/0x27a8 [ 17.693580] __do_sys_finit_module+0xb8/0xf8 [ 17.697843] __arm64_sys_finit_module+0x28/0x38 [ 17.702370] el0_svc_common.constprop.0+0x80/0x1d0 [ 17.707154] do_el0_svc+0x2c/0xa8 [ 17.710465] el0_svc+0x20/0x30 [ 17.713515] el0_sync_handler+0xb0/0xb8 [ 17.717343] el0_sync+0x180/0x1c0 [ 17.720659] Code: f9000260 b140041f 54001128 91024000 (b9400000) [ 17.726748] ---[ end trace fbd7824ab88012ad ]---
What is going on?
.
AM62Ax: the max number of A53 cores is 4, on AM62A*4. This FAQ applies to the other part numbers with 2 or 1 A53 cores: AM62A72, AM62A32, AM62A31
AM62x: the max number of A53 cores is 4, on AM62*4. This FAQ applies to the other part numbers with 2 or 1 A53 cores: AM6252, AM6251, AM6232, AM6231, AM6202, AM6201
AM64x: the max number of A53 cores is 2, on AM64*2. This FAQ applies to the other part numbers with 1 A53 core: AM6441, AM6421, AM6411
UPDATE January 2024: The information in this FAQ has been added to the processor academy modules. This FAQ will not be maintained going forward.
Please find the latest information in the processor's academy > Linux module > Porting > Porting CPU:
AM62x
AM62Ax
AM64x