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Raspberry pi 如何在respberry pi上使用x86 chroot中的alsa

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Raspberry pi 如何在respberry pi上使用x86 chroot中的alsa,raspberry-pi,qemu,alsa,chroot,i386,Raspberry Pi,Qemu,Alsa,Chroot,I386,我设法在chroot中使用qemu i386 static和binfmt在我的raspberry pi 3b stretch上设置了x86 debian stretch，现在我想在chroot（不需要脉冲音频）环境中使用alsa，但是不断得到支持 $ aplay -l Unsupported ioctl: cmd=0x81785501 aplay: device_list:270: no soundcards found... 声卡似乎在chroot中可见 $cat /proc/asound/

我设法在chroot中使用qemu i386 static和binfmt在我的raspberry pi 3b stretch上设置了x86 debian stretch，现在我想在chroot（不需要脉冲音频）环境中使用alsa，但是不断得到支持

$ aplay -l
Unsupported ioctl: cmd=0x81785501
aplay: device_list:270: no soundcards found...
声卡似乎在chroot中可见

$cat /proc/asound/cards
 0 [ALSA           ]: bcm2835 - bcm2835 ALSA
                      bcm2835 ALSA
声卡在常规pi环境中正常工作，并按预期返回列表

$ aplay -l
**** List of PLAYBACK Hardware Devices ****
card 0: ALSA [bcm2835 ALSA], device 0: bcm2835 ALSA [bcm2835 ALSA]
  Subdevices: 8/8
  Subdevice #0: subdevice #0
  Subdevice #1: subdevice #1
  Subdevice #2: subdevice #2
  Subdevice #3: subdevice #3
  Subdevice #4: subdevice #4
  Subdevice #5: subdevice #5
  Subdevice #6: subdevice #6
  Subdevice #7: subdevice #7
card 0: ALSA [bcm2835 ALSA], device 1: bcm2835 ALSA [bcm2835 IEC958/HDMI]
  Subdevices: 1/1
  Subdevice #0: subdevice #0
chroot中的用户与普通用户同名，是所有组的一部分，并且在环境之间装载以下文件夹：

sys
proc
/dev
/dev/pts
/dev/shm
/home/user
下面是chroot中aplay-l的策略，并不是说我已经修剪了一些cacheflush和rt_sigprocmask

1739  execve("/usr/bin/aplay", ["aplay", "-l"], [/* 11 vars */] <unfinished ...>
1739  uname({sysname="Linux", nodename="raspberrypi", ...}) = 0
1739  brk(NULL)                         = 0x63207000
1739  brk(0x63207d58)                   = 0x63207d58
1739  set_tls(0x632074c0, 0x602b162c, 0, 0x602c4f8c, 0x4) = 0
1739  set_tid_address(0x63207068)       = 1739
1739  set_robust_list(0x63207070, 12)   = 0
1739  ugetrlimit(RLIMIT_STACK, {rlim_cur=8192*1024, rlim_max=RLIM_INFINITY}) = 0
1739  readlink("/proc/self/exe", "/usr/bin/qemu-i386-static", 4096) = 25
1739  brk(0x63228d58)                   = 0x63228d58
1739  brk(0x63229000)                   = 0x63229000
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  clone(child_stack=0xb6fdbde8, flags=CLONE_VM|CLONE_FS|CLONE_FILES|CLONE_SIGHAND|CLONE_THREAD|CLONE_SYSVSEM|CLONE_SETTLS|CLONE_PARENT_SETTID|CLONE_CHILD_CLEARTID, parent_tidptr=0xb6fdc318, tls=0xb6fdc770, child_tidptr=0xb6fdc318) = 1741
1741  set_robust_list(0xb6fdc320, 12 <unfinished ...>
1741  <... set_robust_list resumed> )   = 0
1741  nanosleep({tv_sec=0, tv_nsec=10000000},  <unfinished ...>
1739  gettimeofday({tv_sec=1582165215, tv_usec=910982}, NULL) = 0
1739  prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
1739  gettimeofday({tv_sec=1582165215, tv_usec=911591}, NULL) = 0
1739  open("/etc/qemu-binfmt/i386", O_RDONLY|O_NONBLOCK|O_LARGEFILE|O_DIRECTORY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
1739  uname({sysname="Linux", nodename="raspberrypi", ...}) = 0
1739  madvise(0x602dd740, 16771264, MADV_HUGEPAGE) = -1 EINVAL (Invalid argument)
1739  open("/proc/sys/vm/mmap_min_addr", O_RDONLY|O_LARGEFILE) = 4
1739  fstat64(4, {st_mode=S_IFREG|0644, st_size=0, ...}) = 0
1739  read(4, "4096\n", 1024)           = 5
1739  close(4)                          = 0
1739  gettid()                          = 1739
1739  fstat64(3, {st_mode=S_IFREG|0755, st_size=62916, ...}) = 0
1739  geteuid32()                       = 1000
1739  getegid32()                       = 1000
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0!\222\0\0004\0\0\0"..., 1024) = 1024
1739  close(3)                          = 0
1739  brk(0x6324b000)                   = 0x6324b000
1739  open("/lib/ld-linux.so.2", O_RDONLY|O_LARGEFILE) = 3
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0 \n\0\0004\0\0\0"..., 1024) = 1024
1739  close(3)                          = 0
1739  getuid32()                        = 1000
1739  geteuid32()                       = 1000
1739  getgid32()                        = 1000
1739  getegid32()                       = 1000
1741  <... nanosleep resumed> 0xb6fdbc7c) = 0
1741  futex(0x612e3648, FUTEX_WAIT, 4294967295, NULL <unfinished ...>
1739  uname({sysname="Linux", nodename="raspberrypi", ...}) = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  access("/etc/ld.so.preload", R_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/etc/ld.so.cache", O_RDONLY|O_CLOEXEC) = 3
1739  fstat64(3, {st_mode=S_IFREG|0644, st_size=24702, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/lib/i386-linux-gnu/librt.so.1", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0@\30\0\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0644, st_size=30692, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/usr/lib/i386-linux-gnu/libasound.so.2", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\260\341\1\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0644, st_size=1189404, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/lib/i386-linux-gnu/libm.so.6", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340F\0\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0644, st_size=341556, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/lib/i386-linux-gnu/libdl.so.2", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0000\n\0\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0644, st_size=13860, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/lib/i386-linux-gnu/libpthread.so.0", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\0\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\340O\0\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0755, st_size=132328, ...}) = 0
1739  close(3)                          = 0
1739  access("/etc/ld.so.nohwcap", F_OK) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/lib/i386-linux-gnu/libc.so.6", O_RDONLY|O_CLOEXEC) = 3
1739  read(3, "\177ELF\1\1\1\3\0\0\0\0\0\0\0\0\3\0\3\0\1\0\0\0\0\204\1\0004\0\0\0"..., 512) = 512
1739  fstat64(3, {st_mode=S_IFREG|0755, st_size=1791908, ...}) = 0
1739  close(3)                          = 0
1739  munmap(0x40839000, 28672)         = 0
1739  set_tid_address(0x40b9e768)       = 1739
1739  prlimit64(0, RLIMIT_STACK, NULL, {rlim_cur=8192*1024, rlim_max=RLIM64_INFINITY}) = 0
1739  uname({sysname="Linux", nodename="raspberrypi", ...}) = 0
1739  munmap(0xb5f8d000, 135168)        = 0
1739  ioctl(0, TCGETS, {B38400 opost isig icanon echo ...}) = 0
1739  openat(AT_FDCWD, "/dev/snd/controlC0", O_RDONLY|O_CLOEXEC) = 3
1739  fcntl64(3, F_SETFD, FD_CLOEXEC)   = 0
1739  write(2, "Unsupported ioctl: cmd=0x8178550"..., 34) = 34
1739  close(3)                          = 0
1739  openat(AT_FDCWD, "/dev/aloadC0", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/dev/snd/controlC1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
1739  openat(AT_FDCWD, "/dev/aloadC1", O_RDONLY|O_CLOEXEC) = -1 ENOENT (No such file or directory)
1739  write(2, "aplay: device_list:270: ", 24) = 24
1739  write(2, "no soundcards found...", 22) = 22
1739  write(2, "\n", 1)                 = 1
1739  futex(0x4096e0ac, FUTEX_WAKE_PRIVATE, 2147483647) = 0
1739  exit_group(0)                     = ?

1739 execve（“/usr/bin/aplay”、[“aplay”、“-l”]、[/*11 vars*/]
1739 uname（{sysname=“Linux”，nodename=“raspberrypi”，…}）=0
1739 brk（空）=0x63207000
1739 brk（0x63207d58）=0x63207d58
1739设定值（0x632074c0，0x602b162c，0，0x602c4f8c，0x4）=0
1739设置tid地址（0x63207068）=1739
1739设置列表（0x63207070，12）=0
1739 ugetrlimit（rlim_堆栈，{rlim_cur=8192*1024，rlim_max=rlim_无穷大}）=0
1739 readlink（“/proc/self/exe”，“/usr/bin/qemu-i386-static”，4096）=25
1739 brk（0x63228d58）=0x63228d58
1739 brk（0x63229000）=0x63229000
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739克隆（子堆栈=0xb6fdbde8，标志=clone_VM |克隆FS |克隆文件|克隆SIGHAND |克隆线程|克隆SYSVSEM |克隆结算|克隆父项|克隆子项| CLEARTID |父项| tidptr=0xb6fdc318，tls=0x6FDC770，子项| TIDR=0xb6fdc318）=1741
1741设置健壮列表（0xb6fdc320，12
1741   )   = 0
1741纳米睡眠（{tv_sec=0，tv_nsec=10000000}，
1739 gettimeofday（{tv_sec=1582165215，tv_usec=910982}，NULL）=0
1739 prlimit64（0，RLIMIT_堆栈，NULL，{rlim_cur=8192*1024，rlim_max=RLIM64_无穷大}）=0
1739 gettimeofday（{tv_sec=1582165215，tv_usec=911591}，NULL）=0
1739 open（“/etc/qemu binfmt/i386”，O|RDONLY | O|u NONBLOCK | O|u LARGEFILE | O|u DIRECTORY | O|u CLOEXEC）=-1 enoint（无此类文件或目录）
1739 uname（{sysname=“Linux”，nodename=“raspberrypi”，…}）=0
1739 madvise（0x602dd74016771264，MADV_HUGEPAGE）=-1 EINVAL（无效参数）
1739打开（“/proc/sys/vm/mmap_min_addr”，O_RDONLY | O_LARGEFILE）=4
1739 fstat64（4，{st_mode=S|u IFREG | 0644，st_size=0，…}）=0
1739读（4，“4096\n”，1024）=5
1739关闭（4）=0
1739 getId（）=1739
1739 fstat64（3，{st_mode=S|u IFREG | 0755，st_size=62916，…}）=0
1739 geteuid32（）=1000
1739 getegid32（）=1000
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\1\0\0\0\0！\222\0\0004\0\0\0”…，1024）=1024
1739关闭（3）=0
1739 brk（0x6324b000）=0x6324b000
1739 open（“/lib/ld linux.so.2”，O|RDONLY | O|u LARGEFILE）=3
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\1\0\0\0\0\n\0\0004\0\0\0\0”…，1024）=1024
1739关闭（3）=0
1739 getuid32（）=1000
1739 geteuid32（）=1000
1739 getgid32（）=1000
1739 getegid32（）=1000
1741 0xb6fdbc7c）=0
1741 futex（0x612e3648，futex_WAIT，4294967295，空
1739 uname（{sysname=“Linux”，nodename=“raspberrypi”，…}）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739访问（“/etc/ld.so.preload”，R_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/etc/ld.so.cache”，O_RDONLY | O_CLOEXEC）=3
1739 fstat64（3，{st_mode=S|u IFREG | 0644，st_size=24702，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/lib/i386 linux gnu/librt.so.1”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\1\0\0\0\0@\30\0\0004\0\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0644，st_size=30692，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/usr/lib/i386 linux gnu/libasound.so.2”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\1\0\0\0\0\0\260\341\1\0004\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0644，st_size=1189404，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/lib/i386 linux gnu/libm.so.6”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\3\0\0\0\0\0\0\0\3\0\3\0\0\1\0\0\0\340F\0\0004\0\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0644，st_size=341556，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/lib/i386 linux gnu/libdl.so.2”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\1\0\0\0\0000\n\0\0004\0\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0644，st_size=13860，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/lib/i386 linux gnu/libpthread.so.0”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\0\0\0\0\0\0\0\0\3\0\0\0\1\0\0\0\0\0\340O\0\0004\0\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0755，st_size=132328，…}）=0
1739关闭（3）=0
1739访问（“/etc/ld.so.nohwcap”，F_OK）=-1 enoint（没有这样的文件或目录）
1739 openat（AT_FDCWD，“/lib/i386 linux gnu/libc.so.6”，O_RDONLY | O_CLOEXEC）=3
1739读（3，“\177ELF\1\1\1\3\0\0\0\0\0\0\3\0\3\0\0\1\0\0\0\0\0\204\1\0004\0\0\0\0”…，512）=512
1739 fstat64（3，{st_mode=S|u IFREG | 0755，st_size=1791908，…}）=0
1739关闭（3）=0
1739地图（0x408390028672）