First off, I am a openwrt development noob and linux novice. I have some dev experience in other areas and use openwrt on a few routers, but will be stumbling around here. Somebody gave me a Belkin FK91109V1 so I attempting to add support. The main specs for this router at bottom of post.
I have figured out the serial pins and have console access. Also have the openwrt source down and can compile it. I have the Belkin firmware source for a similar, but not exact F9K1110V1 too. By the way as far as I can tell belkin made at least 3 or 4 routers in this space that are very similar like the F9K1103V1 and F9K1110V1.
I have been working through trying to take a hack at a minimal DTS and reading the developer guide materials and have run into several questions.
- Can I work around the flash layout? Again I don't know what is reasonable. I have always assumed the partitions should be left as they are for the stock firmware so you can re-flash back. It looks like the kernel partition on this router is too small for the latest kernel and I saw post where it might be possible to change that. This is a 8MiB flash device. Here are the partitions.
# cat mtd dev: size erasesize name mtd0: 00800000 00010000 "ALL" mtd1: 00030000 00010000 "Bootloader" mtd2: 00010000 00010000 "Config" mtd3: 00010000 00010000 "Factory" mtd4: 0014d3e0 00010000 "Kernel" mtd5: 00662c20 00010000 "RootFS" mtd6: 007a0000 00010000 "Kernel_RootFS" mtd7: 00010000 00010000 "UserCfg"
0x00000000-0x00800000 : "ALL" 0x00000000-0x00030000 : "Bootloader" 0x00030000-0x00040000 : "Config" 0x00040000-0x00050000 : "Factory" 0x00050000-0x0019d3e0 : "Kernel" 0x0019d3e0-0x00800000 : "RootFS" 0x00050000-0x007f0000 : "Kernel_RootFS" 0x007f0000-0x00800000 : "UserCfg"
Assuming my hex math is right it has 1332K for Kernel. Based on this Snapshot not available for certain supported devices recently that will be too small. Should I consider stretching the Kernel partition slightly and reclaiming from RootFS? This is a ramips unit and uses DTS. If it's possible to change, I know I will need to change the map in DTS, where else would I need to?
- The last 4 partitions confuse me in the layering. I am new to this, but I thought each layer would nest into a single "upper layer". Does this layout make sense? Also how would it be represented in DTS?
Thanks in advance for any help. I am a such a noob at this is it possible I am missing several fundamentals.
System on Chip - Ralink 3883 (MIPS 74Kc)
CPU chip: Ralink RT3883
CPU speed: 500Mhz
Package Architecture: mipsel_74kc
Bootloader: Ralink UBoot Version: 188.8.131.52
RAM Size: 64Mb
RAM chip: Winbond #? - F9K1110V1 has winbond W9751G6JB-25
Flash chip: Macronix MX25L6405D
Flash size: 8Mb
LAN Port count: 4
LAN Port speeds 10/100/1000
WAN Port count: 1
WAN Port speeds: 10/100/1000
Switch: chip Realtek RTL8367R-VB
Wireless #1: SoC-integrated : 2.4/5 GHz
Wireless #2: SoC-integrated : 2.4 GHz Ralink RT2860?
USB ports: 2 x USB 2.0
Serial: yes, 4-pin header, (57600,8,N,1), 3.3V TTL, J12
Serial: GND, RX, TX, V - J12 marking on board
JTAG - unknown