MYD-YA15XC-T开发板——1系统分析

bloong · 发表于 2021-10-27 17:42:01

本次的开发板上核心板型号是MYC-YA151C-256N256D-65-I-T，所以从系统中可以看到NAND的分区情况

dev: size erasesize name
mtd0: 00200000 00020000 "fsbl"
mtd1: 00200000 00020000 "ssbl1"
mtd2: 00200000 00020000 "ssbl2"
mtd3: 0fa00000 00020000 "UBI"

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前面三个是FSBL和两个SSBL，那么就能确定，kernel, dtb, rootfs应该都在UBI分区里面。
接下来看下UBI分区里的信息

ubi0
Volumes count: 4
Logical eraseblock size: 126976 bytes, 124.0 KiB
Total amount of logical eraseblocks: 1996 (253444096 bytes, 241.7 MiB)
Amount of available logical eraseblocks: 0 (0 bytes)
Maximum count of volumes 128
Count of bad physical eraseblocks: 4
Count of reserved physical eraseblocks: 36
Current maximum erase counter value: 2
Minimum input/output unit size: 2048 bytes
Character device major/minor: 241:0
Present volumes: 0, 1, 2, 3

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可以看出有四个volume，分别是0,1,2,3。那就依次看下这几个卷

Volume ID: 0 (on ubi0)
Type: dynamic
Alignment: 1
Size: 3 LEBs (380928 bytes, 372.0 KiB)
State: OK
Name: uboot_config
Character device major/minor: 241:1

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可以看出来，vol2是boot，vol3是rootfs。
所以从mount命令也可以看出来

root@myir-ya151c-t:~# mount
ubi0:rootfs on / type ubifs (rw,relatime,assert=read-only,ubi=0,vol=3)
devtmpfs on /dev type devtmpfs (rw,relatime,size=54648k,nr_inodes=13662,mode=755)
sysfs on /sys type sysfs (rw,nosuid,nodev,noexec,relatime)
proc on /proc type proc (rw,relatime)
securityfs on /sys/kernel/security type securityfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /dev/shm type tmpfs (rw,nosuid,nodev)
devpts on /dev/pts type devpts (rw,relatime,gid=5,mode=620,ptmxmode=000)
tmpfs on /run type tmpfs (rw,nosuid,nodev,mode=755)
tmpfs on /sys/fs/cgroup type tmpfs (ro,nosuid,nodev,noexec,mode=755)
cgroup2 on /sys/fs/cgroup/unified type cgroup2 (rw,nosuid,nodev,noexec,relatime,nsdelegate)
cgroup on /sys/fs/cgroup/systemd type cgroup (rw,nosuid,nodev,noexec,relatime,xattr,name=systemd)
pstore on /sys/fs/pstore type pstore (rw,nosuid,nodev,noexec,relatime)
none on /sys/fs/bpf type bpf (rw,nosuid,nodev,noexec,relatime,mode=700)
cgroup on /sys/fs/cgroup/cpu,cpuacct type cgroup (rw,nosuid,nodev,noexec,relatime,cpu,cpuacct)
cgroup on /sys/fs/cgroup/blkio type cgroup (rw,nosuid,nodev,noexec,relatime,blkio)
cgroup on /sys/fs/cgroup/net_cls,net_prio type cgroup (rw,nosuid,nodev,noexec,relatime,net_cls,net_prio)
cgroup on /sys/fs/cgroup/memory type cgroup (rw,nosuid,nodev,noexec,relatime,memory)
cgroup on /sys/fs/cgroup/freezer type cgroup (rw,nosuid,nodev,noexec,relatime,freezer)
cgroup on /sys/fs/cgroup/cpuset type cgroup (rw,nosuid,nodev,noexec,relatime,cpuset)
cgroup on /sys/fs/cgroup/devices type cgroup (rw,nosuid,nodev,noexec,relatime,devices)
mqueue on /dev/mqueue type mqueue (rw,nosuid,nodev,noexec,relatime)
debugfs on /sys/kernel/debug type debugfs (rw,nosuid,nodev,noexec,relatime)
tmpfs on /tmp type tmpfs (rw,nosuid,nodev)
fusectl on /sys/fs/fuse/connections type fusectl (rw,nosuid,nodev,noexec,relatime)
configfs on /sys/kernel/config type configfs (rw,nosuid,nodev,noexec,relatime)
/dev/ubi0_2 on /boot type ubifs (rw,relatime,assert=read-only,ubi=0,vol=2)
tmpfs on /var/volatile type tmpfs (rw,relatime)
tmpfs on /run/user/0 type tmpfs (rw,nosuid,nodev,relatime,size=24136k,mode=700)

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至于0和1，后面来分析。
当前配置是nand 256MB的，看下系统还剩下多少空间可以使用

root@myir-ya151c-t:~# df -h
Filesystem Size Used Avail Use% Mounted on
ubi0:rootfs 201M 177M 25M 88% /
devtmpfs 54M 0 54M 0% /dev
tmpfs 118M 64K 118M 1% /dev/shm
tmpfs 118M 8.8M 110M 8% /run
tmpfs 118M 0 118M 0% /sys/fs/cgroup
tmpfs 118M 0 118M 0% /tmp
/dev/ubi0_2 15M 11M 3.4M 77% /boot
tmpfs 118M 136K 118M 1% /var/volatile
tmpfs 24M 0 24M 0% /run/user/0

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已经被使用了88%，所以只有25MB可以使用，也运行不了多少应用了。对于使用nand来作为产品开发，还需要更深度的对系统优化，后面有时间可以做这方面看看。

再看看ram的使用情况

root@myir-ya151c-t:~# free
total used free shared buff/cache available
Mem: 241392 55156 129216 9120 57020 171316
Swap: 0 0 0

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总共256MB，系统占用后，剩余可以使用的只有130MB左右。那就再看下当前系统默认运行了哪些应用

root@myir-ya151c-t:~# ps -ef
UID PID PPID C STIME TTY TIME CMD
root 1 0 0 15:50 ? 00:00:05 /sbin/init
root 2 0 0 15:50 ? 00:00:00 [kthreadd]
root 3 2 0 15:50 ? 00:00:00 [rcu_gp]
root 4 2 0 15:50 ? 00:00:00 [rcu_par_gp]
root 6 2 0 15:50 ? 00:00:00 [kworker/0:0H-events_highpri]
root 7 2 0 15:50 ? 00:00:00 [kworker/u2:0-events_unbound]
root 8 2 0 15:50 ? 00:00:00 [mm_percpu_wq]
root 9 2 0 15:50 ? 00:00:01 [ksoftirqd/0]
root 10 2 0 15:50 ? 00:00:00 [rcu_preempt]
root 11 2 0 15:50 ? 00:00:00 [migration/0]
root 12 2 0 15:50 ? 00:00:00 [cpuhp/0]
root 13 2 0 15:50 ? 00:00:00 [kdevtmpfs]
root 14 2 0 15:50 ? 00:00:00 [netns]
root 15 2 0 15:50 ? 00:00:00 [rcu_tasks_kthre]
root 16 2 0 15:50 ? 00:00:06 [kworker/0:1-pm]
root 17 2 0 15:50 ? 00:00:00 [oom_reaper]
root 18 2 0 15:50 ? 00:00:00 [writeback]
root 19 2 0 15:50 ? 00:00:00 [kcompactd0]
root 87 2 0 15:50 ? 00:00:00 [kblockd]
root 88 2 0 15:50 ? 00:00:00 [blkcg_punt_bio]
root 89 2 0 15:50 ? 00:00:00 [ata_sff]
root 90 2 0 15:50 ? 00:00:00 [edac-poller]
root 91 2 0 15:50 ? 00:00:00 [devfreq_wq]
root 92 2 0 15:50 ? 00:00:00 [watchdogd]
root 93 2 0 15:50 ? 00:00:00 [rpciod]
root 94 2 0 15:50 ? 00:00:00 [kworker/u3:0-hci0]
root 95 2 0 15:50 ? 00:00:00 [xprtiod]
root 96 2 0 15:50 ? 00:00:00 [kswapd0]
root 97 2 0 15:50 ? 00:00:00 [nfsiod]
root 98 2 0 15:50 ? 00:00:00 [cifsiod]
root 99 2 0 15:50 ? 00:00:00 [smb3decryptd]
root 100 2 0 15:50 ? 00:00:00 [cifsfileinfoput]
root 101 2 0 15:50 ? 00:00:00 [cifsoplockd]
root 106 2 0 15:50 ? 00:00:00 [krfcommd]
root 107 2 0 15:50 ? 00:00:00 [kstrp]
root 118 2 0 15:50 ? 00:00:00 [hwrng]
root 119 2 0 15:50 ? 00:00:00 [irq/45-stm_ther]
root 124 2 0 15:50 ? 00:00:00 [irq/46-54002000]
root 125 2 0 15:50 ? 00:00:00 [54002000.hash-e]
root 143 2 0 15:50 ? 00:00:00 [irq/59-5c004000]
root 144 2 0 15:50 ? 00:00:00 [irq/60-40013000]
root 145 2 0 15:50 ? 00:00:00 [irq/65-5c002000]
root 146 2 0 15:50 ? 00:00:00 [irq/67-pmic_irq]
root 150 2 0 15:50 ? 00:00:00 [irq/77-4c001000]
root 151 2 0 15:50 ? 00:00:00 [irq/78-4c001000]
root 152 2 0 15:50 ? 00:00:00 [mlahb:m4@100000]
root 154 2 0 15:50 ? 00:00:00 [irq/80-48003000]
root 155 2 0 15:50 ? 00:00:00 [irq/81-48003000]
root 156 2 0 15:50 ? 00:00:00 [stmmac_wq]
root 158 2 0 15:51 ? 00:00:00 [irq/63-0-0028]
root 159 2 0 15:51 ? 00:00:00 [ubi_bgt0d]
root 161 2 0 15:51 ? 00:00:00 [ubifs_bgt0_3]
root 162 2 0 15:51 ? 00:00:00 [ipv6_addrconf]
root 618 1 2 15:51 ? 00:00:35 /usr/sbin/rngd -f -r /dev/hwrng
rpc 622 1 0 15:51 ? 00:00:00 /usr/sbin/rpcbind -w -f
root 629 1 0 15:51 ? 00:00:00 /lib/systemd/systemd-journald
root 638 2 0 15:51 ? 00:00:00 [ubifs_bgt0_2]
root 652 1 0 15:51 ? 00:00:00 /lib/systemd/systemd-udevd
systemd+ 656 1 0 15:51 ? 00:00:01 /lib/systemd/systemd-timesyncd
root 670 2 0 15:51 ? 00:00:00 [irq/22-44009000]
root 671 2 0 15:51 ? 00:00:00 [spi0]
root 688 1 0 15:51 ? 00:00:00 /sbin/klogd -n
root 692 1 0 15:51 ? 00:00:00 /sbin/syslogd -n
message+ 698 1 0 15:51 ? 00:00:00 /usr/bin/dbus-daemon --system --address=systemd: --nofork --nopidfile --systemd-activation --syslog-only
root 725 2 0 15:51 ? 00:00:00 [irq/42-4c006000]
root 726 2 0 15:51 ? 00:00:00 [irq/57-5c000000]
root 727 2 0 15:51 ? 00:00:00 [kworker/u2:2-events_unbound]
root 730 2 0 15:51 ? 00:00:00 [kworker/u3:2-hci0]
root 769 1 0 15:51 ? 00:00:00 /lib/systemd/systemd-logind
root 770 1 0 15:51 ? 00:00:00 /usr/libexec/bluetooth/bluetoothd
systemd+ 771 1 0 15:51 ? 00:00:01 /lib/systemd/systemd-networkd
root 773 1 1 15:51 ? 00:00:17 /usr/sbin/netdata -D -u root
systemd+ 778 1 0 15:51 ? 00:00:00 /lib/systemd/systemd-resolved
avahi 779 1 0 15:51 ? 00:00:00 avahi-daemon: running [myir-ya151c-t.local]
root 780 1 0 15:51 ? 00:00:00 /usr/sbin/iiod
64371 781 1 0 15:51 ? 00:00:00 /sbin/ninfod -d
avahi 782 779 0 15:51 ? 00:00:00 avahi-daemon: chroot helper
pulse 784 1 0 15:51 ? 00:00:00 /usr/bin/pulseaudio --system --realtime --disallow-exit --daemonize=no
61563 785 1 0 15:51 ? 00:00:00 /sbin/rdisc -f -t
root 787 1 0 15:51 ? 00:00:00 /usr/sbin/vsftpd
root 790 1 0 15:51 tty1 00:00:00 /sbin/agetty -o -p -- \u --noclear tty1 linux
root 791 1 0 15:51 ttySTM0 00:00:00 /bin/login -f
root 794 2 0 15:51 ? 00:00:00 [irq/55-40010000]
root 796 1 0 15:51 ? 00:00:00 /lib/systemd/systemd --user
root 797 796 0 15:51 ? 00:00:00 (sd-pam)
root 802 791 0 15:51 ttySTM0 00:00:00 -sh
root 807 1 0 15:51 ? 00:00:00 /usr/bin/dbus-daemon --syslog --fork --print-pid 4 --print-address 6 --session
root 815 1 0 15:51 ? 00:00:00 /usr/bin/dbus-daemon --syslog --fork --print-pid 4 --print-address 6 --session
root 823 1 0 15:51 ? 00:00:00 /usr/bin/dbus-daemon --syslog --fork --print-pid 4 --print-address 6 --session
root 839 2 0 15:51 ? 00:00:00 [kworker/0:1H]
root 869 773 2 15:51 ? 00:00:31 /usr/libexec/netdata/plugins.d/apps.plugin 2
root 871 773 0 15:51 ? 00:00:08 bash /usr/libexec/netdata/plugins.d/charts.d.plugin 2
root 873 773 0 15:51 ? 00:00:05 /usr/bin/python3 /usr/libexec/netdata/plugins.d/python.d.plugin 2
root 1043 2 0 15:52 ? 00:00:00 [cfg80211]
root 1547 2 0 15:57 ? 00:00:10 [kworker/0:0+events_freezable]
root 2057 2 0 16:05 ? 00:00:02 [kworker/0:2-events]
root 2379 2 0 16:10 ? 00:00:02 [kworker/0:3-events]
root 2688 2 0 16:15 ? 00:00:00 [kworker/0:4-events]

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看到有个netdata的python应用在运行，可以关闭看看能节省多少ram出来，其他的bluetooth，ftp不需要的也可以关闭，毕竟板上也没有这些硬件外设。

root@myir-ya151c-t:~# systemctl stop netdata
root@myir-ya151c-t:~# systemctl stop bluetooth

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关闭后有20MB，还是有一些优化的空间。

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