Xiaomi uses mtd4 for JFFS2. SDK uses MTD3

[GrumpyMeow]

Better is to make this eqeual

[GrumpyMeow]

this is from a working system:

lib80211: common routines for IEEE802.11 drivers
VFS: Mounted root (cramfs filesystem) readonly on device 31:2.
Freeing init memory: 120K
hub 1-0:1.0: /run/media/fedora/software/SN986_1.50_P2P_TUTK_050a_20160921_1712/snx_sdk/kernel/linux-2.6.35.12/src/drivers/usb/core/hub.c 3351: state 7 ports 1 chg 0002 evt 0000
hub 1-0:1.0: port 1, status 0503, change 0000, 480 Mb/s
Create device file
snx_crypto driver loaded.
sonix crypto diver register
sonix_nvram_init
Init nvram id: 1303281516
Init nvram_crc id: 0x54594
nvram_check crc = 54594 crc_ref = 54594
SONIX Kernel NVRAM initialized
starting pid 529, tty '': '/etc/init.d/rcS'
Load drivers...
Sonix GPIO Driver

/dev/nvram
130 crw-r--r-- 1 root root 251, 0 Jan 1 1970 nvram

cat /proc/mtd
dev: size erasesize name
mtd0: 000c0000 00001000 "uboot"
mtd1: 00300000 00001000 "kernel"
mtd2: 00700000 00001000 "rootfs"
mtd3: 00400000 00001000 "rescue"
mtd4: 00100000 00001000 "etc"
mtd5: 00040000 00001000 "userconfig"

cat /proc/meminfo
MemTotal: 36956 kB
MemFree: 5860 kB
Buffers: 3936 kB
Cached: 12360 kB
SwapCached: 0 kB
Active: 14020 kB
Inactive: 10728 kB
Active(anon): 9936 kB
Inactive(anon): 28 kB
Active(file): 4084 kB
Inactive(file): 10700 kB
Unevictable: 24 kB
Mlocked: 24 kB
SwapTotal: 0 kB
SwapFree: 0 kB
Dirty: 0 kB
Writeback: 0 kB
AnonPages: 8492 kB
Mapped: 4736 kB
Shmem: 1512 kB
Slab: 2504 kB
SReclaimable: 576 kB
SUnreclaim: 1928 kB
KernelStack: 584 kB
PageTables: 264 kB
NFS_Unstable: 0 kB
Bounce: 0 kB
WritebackTmp: 0 kB
CommitLimit: 18476 kB
Committed_AS: 50504 kB
VmallocTotal: 450560 kB
VmallocUsed: 23596 kB
VmallocChunk: 413692 kB

cat /dev/vmallocinfo
0xbf000000-0xbf003000 12288 module_alloc_update_bounds+0xc/0x5c pages=2 vmalloc
0xbf007000-0xbf00a000 12288 module_alloc_update_bounds+0xc/0x5c pages=2 vmalloc
0xbf00e000-0xbf010000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf014000-0xbf016000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf01a000-0xbf020000 24576 module_alloc_update_bounds+0xc/0x5c pages=5 vmalloc
0xbf025000-0xbf04a000 151552 module_alloc_update_bounds+0xc/0x5c pages=36 vmalloc
0xbf052000-0xbf054000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf058000-0xbf05a000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf05e000-0xbf062000 16384 module_alloc_update_bounds+0xc/0x5c pages=3 vmalloc
0xbf066000-0xbf06b000 20480 module_alloc_update_bounds+0xc/0x5c pages=4 vmalloc
0xbf06f000-0xbf071000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf075000-0xbf077000 8192 module_alloc_update_bounds+0xc/0x5c pages=1 vmalloc
0xbf07b000-0xbf08a000 61440 module_alloc_update_bounds+0xc/0x5c pages=14 vmalloc
0xbf090000-0xbf185000 1003520 module_alloc_update_bounds+0xc/0x5c pages=244 vmalloc
0xbf1a0000-0xbf1a3000 12288 module_alloc_update_bounds+0xc/0x5c pages=2 vmalloc
0xc4807000-0xc4813000 49152 cramfs_uncompress_init+0x2c/0x60 pages=11 vmalloc
0xc4814000-0xc4857000 274432 jffs2_zlib_init+0x14/0xa4 pages=66 vmalloc
0xc4858000-0xc4864000 49152 jffs2_zlib_init+0x40/0xa4 pages=11 vmalloc
0xc4866000-0xc4868000 8192 snx_spi_probe+0x1a0/0x3d0 ioremap
0xc486a000-0xc486c000 8192 usb_ehci_sonix_probe+0x7c/0x12c ioremap
0xc486e000-0xc4870000 8192 snx_hdma_probe+0xd8/0x530 ioremap
0xc4876000-0xc4878000 8192 snx_crypto_probe+0x68/0x698 [snx_crypto] ioremap
0xc487e000-0xc4880000 8192 0xbf00b070 pages=1 vmalloc
0xc4886000-0xc4888000 8192 snx_gpio_probe+0x9c/0x39c [snx_gpio] ioremap
0xc488e000-0xc4890000 8192 snx_aud_gpio_register+0x14/0x6c [snx_i2s_gpio] ioremap
0xc48c8000-0xc48cb000 12288 0xbf04b100 ioremap
0xc48cc000-0xc48ce000 8192 0xbf04b15c ioremap
0xc48e4000-0xc4905000 135168 firmware_loading_store+0x68/0x1dc
0xc4906000-0xc4908000 8192 soc_camera_host_register+0x56c/0x8c8 pages=1 vmalloc
0xc490a000-0xc490c000 8192 snx_sd_probe+0xfc/0x4b8 [snx_sd] ioremap
0xc4916000-0xc4918000 8192 snx_wdt_probe+0xa0/0x150 [snx_wdt] ioremap
0xc4a64000-0xc4a66000 8192 snx_vc_probe+0x108/0x704 [snx_vc] ioremap
0xc4ae6000-0xc4ae8000 8192 snx_rtc_probe+0xd8/0x1a4 [snx_rtc] ioremap
0xc4ae9000-0xc4aee000 20480 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=4 vmalloc
0xc4aef000-0xc4b06000 94208 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=22 vmalloc
0xc4b07000-0xc4b26000 126976 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=30 vmalloc
0xc4b27000-0xc4b35000 57344 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=13 vmalloc
0xc4b36000-0xc4b38000 8192 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=1 vmalloc
0xc4b39000-0xc4b3c000 12288 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=2 vmalloc
0xc4b3d000-0xc4b3f000 8192 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=1 vmalloc
0xc4b40000-0xc4b4d000 53248 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=12 vmalloc
0xc4b4e000-0xc4b61000 77824 _rtw_zvmalloc+0xc/0x30 [8188eu] pages=18 vmalloc
0xc5000000-0xc5a01000 10489856 dma_declare_coherent_memory+0x50/0xf0 ioremap
0xc6000000-0xc6c01000 12587008 dma_declare_coherent_memory+0x50/0xf0 ioremap

/proc # df
Filesystem 1K-blocks Used Available Use% Mounted on
/dev/root [EXFAT] statfs on device is ejected
15392 15392 0 100% /
dev 512 8 504 2% /dev
/dev/mtdblock4 1024 556 468 54% /etc
tmpfs 36956 1184 35772 3% /tmp
lock 18476 0 18476 0% /var/lock
log 18476 336 18140 2% /var/log
run 18476 16 18460 0% /var/run
spool 18476 0 18476 0% /var/spool
tmp 18476 0 18476 0% /var/tmp
mq 18476 0 18476 0% /var/mq
media 18476 0 18476 0% /media
/dev/mmcblk0p1 102208 41096 61112 40% /media/mmcblk0p1