RPI:在树莓派(RPI 3B)上运行Android 9.0系统

全世界首发!!!在Raspberry Pi 3B上运行Android 9.0系统

  • 动机

需要有这么一个硬件:

1. 带有GPIO/I2C/SPI/UART接口

2. 可以运行Android系统,这意味着至少要有1G的内存

3. 有kernel源代码

4. 可以通过串口在线看kernel log, 因为需要开发kernel的驱动

5. 便宜并且有很不错的硬件性能

软件上:

需要能够比较轻松地将Android或者Android things系统移植上去。Android things系统已经可以在Raspberry Pi 3B上运行了,这样我们做系统移植的时候,就可以做一些参考。

Google已经将Android系统开源了,为什么不将Android things系统也开源呢,有点让人费解。

所以,这里我们选择了树莓派。

 

Android things是基于Android 8.1的系统,我们之前也试过将Android 8.1的系统移植到树莓派:

RPI3: 在树莓派3上运行ANDROID 8.1系统

但这次,我们需要将最新的Android 9.0的系统移植上去。

  • 性能

从之前的移植Android 8.1的经验及使用Google Android things 1.0.4版本的系统,就可以预见到在树莓派上运行Android 9.0系统会非常的卡。

对于 4核1.2G主频,1G内存(实际使用到的只有700多M),并且图形渲染使用的是swiftshader这种纯软件的渲染,还能期望它性能能好到哪里去呢。

Starting kernel ...

[    0.000000] Booting Linux on physical CPU 0x0
[    0.000000] Initializing cgroup subsys cpuset
[    0.000000] Initializing cgroup subsys cpu
[    0.000000] Initializing cgroup subsys cpuacct
[    0.000000] Initializing cgroup subsys schedtune
[    0.000000]   schedtune configured to support 4 boost groups
[    0.000000] Linux version 4.4.19-v7+ (android-build@vpeg11.mtv.corp.google.com) (gcc version 4.9.x 20150123 (prerelease) (GCC) ) #1 SMP PREEMPT Mon Sep 17 23:18:10 UTC 2018
[    0.000000] CPU: ARMv7 Processor [410fd034] revision 4 (ARMv7), cr=10c5383d
[    0.000000] CPU: PIPT / VIPT nonaliasing data cache, VIPT aliasing instruction cache
[    0.000000] Machine model: Raspberry Pi 3 Model B Rev 1.2
[    0.000000] debug: ignoring loglevel setting.
[    0.000000] cma: Reserved 8 MiB at 0x2e400000
[    0.000000] Memory policy: Data cache writealloc
[    0.000000] On node 0 totalpages: 192512
[    0.000000] free_area_init_node: node 0, pgdat c11a8bc0, node_mem_map ed956000
[    0.000000]   Normal zone: 1692 pages used for memmap
[    0.000000]   Normal zone: 0 pages reserved
[    0.000000]   Normal zone: 192512 pages, LIFO batch:31
[    0.000000] [bcm2709_smp_init_cpus] enter (1015a0->f3003010)
[    0.000000] [bcm2709_smp_init_cpus] ncores=4
[    0.000000] PERCPU: Embedded 11 pages/cpu @eefa5000 s23296 r0 d21760 u45056
[    0.000000] pcpu-alloc: s23296 r0 d21760 u45056 alloc=11*4096
[    0.000000] pcpu-alloc: [0] 0 [0] 1 [0] 2 [0] 3
[    0.000000] Built 1 zonelists in Zone order, mobility grouping on.  Total pages: 190820
[    0.000000] Kernel command line: 8250.nr_uarts=1 8250.nr_uarts=1 dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1920 bcm2708_fb.fbheight=1080 bcm2709.boardrev=0xa22082 bcm2709.serial=0xdc0f3c90 smsc95xx.macaddr=B8:27:EB:0F:3C:90 bcm2708_fb.fbdepth=16 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000  dwc_otg.lpm_enable=0 console=ttyS0,115200 ro rootfstype=ext4 elevator=deadline fsck.repair=yes rootwait earlyprintk init=/init androidboot.hardware=rpi3 androidboot.selinux=permissive ignore_loglevel androidboot.serialno=00000000dc0f3c90 androidboot.slot_suffix=_a root="/dev/mmcblk0p6" skip_initramfs buildvariant=userdebug
[    0.000000] PID hash table entries: 4096 (order: 2, 16384 bytes)
[    0.000000] Dentry cache hash table entries: 131072 (order: 7, 524288 bytes)
[    0.000000] Inode-cache hash table entries: 65536 (order: 6, 262144 bytes)
[    0.000000] Memory: 730968K/770048K available (12018K kernel code, 711K rwdata, 2880K rodata, 1024K init, 881K bss, 30888K reserved, 8192K cma-reserved)
[    0.000000] Virtual kernel memory layout:
[    0.000000]     vector  : 0xffff0000 - 0xffff1000   (   4 kB)
[    0.000000]     fixmap  : 0xffc00000 - 0xfff00000   (3072 kB)
[    0.000000]     vmalloc : 0xef800000 - 0xff800000   ( 256 MB)
[    0.000000]     lowmem  : 0xc0000000 - 0xef000000   ( 752 MB)
[    0.000000]       .text : 0xc0008000 - 0xc0f8cb80   (15891 kB)
[    0.000000]       .init : 0xc1000000 - 0xc1100000   (1024 kB)
[    0.000000]       .data : 0xc1100000 - 0xc11b1fb4   ( 712 kB)
[    0.000000]        .bss : 0xc11b4000 - 0xc12906cc   ( 882 kB)
[    0.000000] SLUB: HWalign=64, Order=0-3, MinObjects=0, CPUs=4, Nodes=1
[    0.000000] Preemptible hierarchical RCU implementation.
[    0.000000]  Build-time adjustment of leaf fanout to 32.
[    0.000000] NR_IRQS:16 nr_irqs:16 16
[    0.000000] Architected cp15 timer(s) running at 19.20MHz (phys).

==待续==

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