raspberrypi2-64.conf: add machine for Raspberry Pi 2B V1.2 (64-bit)

[gportay]

This machine configuration is for the Raspberry Pi 2B V1.2 (64-bit).

Note: Raspberry Pi 2 Model B V1.21 switched from BCM28362 (V1.0, V1.1) to BCM28373 that is 64-bit CPU used in Raspberry Pi 3 Model B.

BCM2836[2]

The Broadcom chip used in the Raspberry Pi 2 Model B. The
underlying architecture in BCM2836 is identical to BCM2835. The
only significant difference is the removal of the ARM1176JZF-S
processor and replacement with a quad-core Cortex-A7 cluster.

BCM2837[3]

This is the Broadcom chip used in the Raspberry Pi 3 Model B,
later models of the Raspberry Pi 2 Model B, and the Raspberry Pi
Compute Module 3. The underlying architecture of the BCM2837 is
identical to the BCM2836. The only significant difference is the
replacement of the ARMv7 quad core cluster with a quad-core ARM
Cortex A53 (ARMv8) cluster.

The ARM cores run at 1.2GHz, making the device about 50% faster
than the Raspberry Pi 2. The VideoCore IV runs at 400MHz.

See:

Poky (Yocto Project Reference Distro) 5.2.99+snapshot-cfbb00657ab961a3c3a8e6619fc08a2a3f4255c7 raspberrypi2-64 ttyAMA0

raspberrypi2-64 login: root

WARNING: Poky is a reference Yocto Project distribution that should be used for testing and development purposes only. It is recommended that you create your own distribution for production use.

root@raspberrypi2-64:~# uname -a
Linux raspberrypi2-64 6.12.41-v8 #1 SMP PREEMPT Thu Aug  7 16:48:46 UTC 2025 aarch64 GNU/Linux
root@raspberrypi2-64:~# cat /proc/device-tree/compatible
raspberrypi,2-model-b-rev2brcm,bcm2837
root@raspberrypi2-64:~# tty
/dev/ttyAMA0
root@raspberrypi2-64:~# dmesg | head
[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Linux version 6.12.41-v8 (oe-user@oe-host) (aarch64-poky-linux-gcc (GCC) 15.2.0, GNU ld (GNU Binutils) 2.45.0.20250908) #1 SMP PREEMPT Thu Aug  7 16:48:46 UTC 2025
[    0.000000] KASLR enabled
[    0.000000] random: crng init done
[    0.000000] Machine model: Raspberry Pi 2 Model B Rev 1.2
[    0.000000] efi: UEFI not found.
[    0.000000] Reserved memory: created CMA memory pool at 0x000000001ec00000, size 256 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x000000001ec00000..0x000000002ebfffff (262144 KiB) map reusable linux,cma
[    0.000000] NUMA: Faking a node at [mem 0x0000000000000000-0x000000003b3fffff]

[gportay]

I have tested using u-boot:

U-Boot 2025.07 (Jul 07 2025 - 15:48:28 +0000)

DRAM:  948 MiB
RPI 2 Model B (0xa22042)
Core:  78 devices, 12 uclasses, devicetree: board
MMC:   mmc@7e202000: 0
Loading Environment from FAT... OK
In:    serial,usbkbd
Out:   serial,vidconsole
Err:   serial,vidconsole
Net:   No ethernet found.

starting USB...
USB DWC2
Bus usb@7e980000: 3 USB Device(s) found
       scanning usb for storage devices... 0 Storage Device(s) found
Hit any key to stop autoboot:  0 
Cannot persist EFI variables without system partition
Missing RNG device for EFI_RNG_PROTOCOL
** Booting bootflow '<NULL>' with efi_mgr
Loading Boot0000 'mmc 0' failed
EFI boot manager: Cannot load any image
Boot failed (err=-14)
** Booting bootflow '[email protected]_1' with script
Working FDT set to 2eff7c00
25899520 bytes read in 2151 ms (11.5 MiB/s)
Moving Image from 0x80000 to 0x200000, end=0x1b60000
## Flattened Device Tree blob at 2eff7c00
   Booting using the fdt blob at 0x2eff7c00
Working FDT set to 2eff7c00
   Loading Device Tree to 000000001fff4000, end 000000001ffff387 ... OK
Working FDT set to 1fff4000

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0000000000 [0x410fd034]
[    0.000000] Linux version 6.12.41-v8 (oe-user@oe-host) (aarch64-poky-linux-gcc (GCC) 15.2.0, GNU ld (GNU Binutils) 2.45.0.20250908) #1 SMP PREEMPT Thu Aug  7 16:48:46 UTC 2025
[    0.000000] KASLR enabled
[    0.000000] random: crng init done
[    0.000000] Machine model: Raspberry Pi 2 Model B Rev 1.2
[    0.000000] efi: UEFI not found.
[    0.000000] Reserved memory: created CMA memory pool at 0x000000002b400000, size 256 MiB
[    0.000000] OF: reserved mem: initialized node linux,cma, compatible id shared-dma-pool
[    0.000000] OF: reserved mem: 0x000000002b400000..0x000000003b3fffff (262144 KiB) map reusable linux,cma
[    0.000000] NUMA: Faking a node at [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000] NODE_DATA(0) allocated [mem 0x2b200d80-0x2b203a7f]
[    0.000000] Zone ranges:
[    0.000000]   DMA      [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000]   DMA32    empty
[    0.000000]   Normal   empty
[    0.000000] Movable zone start for each node
[    0.000000] Early memory node ranges
[    0.000000]   node   0: [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000] Initmem setup node 0 [mem 0x0000000000000000-0x000000003b3fffff]
[    0.000000] On node 0, zone DMA: 19456 pages in unavailable ranges
[    0.000000] percpu: Embedded 33 pages/cpu s96216 r8192 d30760 u135168
[    0.000000] Detected VIPT I-cache on CPU0
[    0.000000] CPU features: kernel page table isolation forced ON by KASLR
[    0.000000] CPU features: detected: Kernel page table isolation (KPTI)
[    0.000000] CPU features: detected: ARM erratum 843419
[    0.000000] CPU features: detected: ARM erratum 845719
[    0.000000] alternatives: applying boot alternatives
[    0.000000] Kernel command line: coherent_pool=1M snd_bcm2835.enable_headphones=0 cgroup_disable=memory snd_bcm2835.enable_headphones=1 snd_bcm2835.enable_hdmi=1 clk_ignore_unused  vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000  dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait  net.ifnames=0
[    0.000000] cgroup: Disabling memory control group subsystem
[    0.000000] Dentry cache hash table entries: 131072 (order: 8, 1048576 bytes, linear)
[    0.000000] Inode-cache hash table entries: 65536 (order: 7, 524288 bytes, linear)
[    0.000000] Fallback order for Node 0: 0 
[    0.000000] Built 1 zonelists, mobility grouping on.  Total pages: 242688
[    0.000000] Policy zone: DMA
[    0.000000] mem auto-init: stack:all(zero), heap alloc:off, heap free:off
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] ftrace: allocating 48732 entries in 191 pages
[    0.000000] ftrace: allocated 191 pages with 7 groups
[    0.000000] rcu: Preemptible hierarchical RCU implementation.
[    0.000000] rcu: 	RCU event tracing is enabled.
[    0.000000] 	Trampoline variant of Tasks RCU enabled.
[    0.000000] 	Rude variant of Tasks RCU enabled.
[    0.000000] 	Tracing variant of Tasks RCU enabled.
[    0.000000] rcu: RCU calculated value of scheduler-enlistment delay is 25 jiffies.
[    0.000000] RCU Tasks: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
[    0.000000] RCU Tasks Rude: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
[    0.000000] RCU Tasks Trace: Setting shift to 2 and lim to 1 rcu_task_cb_adjust=1 rcu_task_cpu_ids=4.
[    0.000000] NR_IRQS: 64, nr_irqs: 64, preallocated irqs: 0
[    0.000000] Root IRQ handler: bcm2836_arm_irqchip_handle_irq
[    0.000000] rcu: srcu_init: Setting srcu_struct sizes based on contention.
[    0.000000] arch_timer: cp15 timer(s) running at 19.20MHz (phys).
[    0.000000] clocksource: arch_sys_counter: mask: 0xffffffffffffff max_cycles: 0x46d987e47, max_idle_ns: 440795202767 ns
[    0.000000] sched_clock: 56 bits at 19MHz, resolution 52ns, wraps every 4398046511078ns
...

Poky (Yocto Project Reference Distro) 5.2.99+snapshot-cfbb00657ab961a3c3a8e6619fc08a2a3f4255c7 raspberrypi2-64 ttyAMA0

raspberrypi2-64 login: 

[agherzan]

Today I learned about this variant. Thanks for looking into it. Could you also add this machine to CI?

[gportay]

Today I learned about this variant. Thanks for looking into it. Could you also add this machine to CI?

Sure. I will do it.

[agherzan]

Looks good. Thanks!