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--- toh:mikrotik:rb493g [2012/09/28 00:23]
renne Link for USB-content fixed.
+++ toh:mikrotik:rb493g [2013/05/06 16:38] (current)
renne Download URL updated to openwrt version 12.09
@@ Line 3: / Line 3: @@
 ===== Hardware Highlights =====
 ^ CPU ^ Ram ^ Flash ^ Network ^ USB ^ Serial ^ JTag ^ MiniPCI ^
-| Atheros AR7161 | 256MiB | 128MiB, 1x Micro-SD-socket | 9x 1000Base-T | 1x 2.0 unpowered | Yes (console) | ??? (contacts on PCB) | 3x Type IIIA/B |
+| Atheros AR7161 680/800 MHz | 256MiB | 128MiB, 1x Micro-SD-socket | 9x 1000Base-T | 1x 2.0 unpowered | Yes (console) | ??? (contacts on PCB) | 3x Type IIIA/B |
 ==== Pricing/Where to buy ====
-^ Shop ^ Country ^ Routerboard 493G ^ Encasing CA493 ^
+^ Shop ^ Country ^ Routerboard 493G ^ Encasing CA493 ^ Last checked ^
-| http://shop.meconet.de/ | DE | 145,- € | 19,- € |
+| http://shop.meconet.de/ | DE | 140,- € | 19,- € | 2012-12-25 |
-| http://varia-store.com/ | DE | 170,- € | 20,- € |
+| http://varia-store.com/ | DE | 172,- € | 20,- € | 2012-12-25 |
-| http://varia-store.com/ | DE | 215,- $ | 25,- $ |
+| http://varia-store.com/ | DE | 220,- $ | 26,- $ | 2012-12-25 |
 ===== Installation =====
@@ Line 15: / Line 15: @@
 ==== Flash Layout ====
 Please check out the article [[doc:techref:Flash Layout]]. It contains an example and a couple of explanations.
+<code>root@OpenWrt:/# cat /proc/mtd
+dev:    size   erasesize  name
+mtd0: 0000b000 00001000 "routerboot"
+mtd1: 00001000 00001000 "hard_config"
+mtd2: 00002000 00001000 "bios"
+mtd3: 00001000 00001000 "soft_config"
+mtd4: 00040000 00020000 "booter"
+mtd5: 003c0000 00020000 "kernel"
+mtd6: 07c00000 00020000 "rootfs"</code>
+The two partitions used to install OpenWrt are kernel and rootfs. Their sizes are in bytes with hex, which translates to 3840KiB for kernel and 126976KiB for rootfs.
 ==== Netboot via BOOTP/TFTP ====
@@ Line 20: / Line 30: @@
 The bootloader is able to load an image in ELF-format via BOOTP/DHCP and TFTP into RAM and execute it.
-=== Setup the Host ===
+=== Use another OpenWrt router as netboot server ===
+This is the easiest way to achieve a live boot of your RB493G, but it requires that you already have an OpenWrt router with net-access available. You will need to obtain an elf-image for the RB493G, and make it available to the other router. If you have enough memory available on the other router, you can put the image on the /tmp folder there, e.g., like this:
+<code>ssh root@192.168.1.1
+wget --directory-prefix=/tmp http://downloads.openwrt.org/attitude_adjustment/12.09-beta2/ar71xx/nand/openwrt-ar71xx-nand-vmlinux-initramfs.elf</code>
+Now enable dnsmasq's built in tftp server, and point it to the correct locations, e.g., like this:
+{{ :toh:mikrotik:tftpnetbootconfig.png?630 |Setting up netboot in Luci, note the full path for the filename. }}
+That's it, Save and apply, connect the Eth1/WAN port of RB493G to one of the other routers LAN ports, and continue to [[toh:mikrotik:rb493g#setup.the.routerboard|Setup the Routerboard]].
+=== Use a Debian based server for netboot ===
 You need a BOOTP- and a TFTP-server on your host-machine, we use ''dnsmasq'' here, since it can provide both services. Install dnsmasq with:
 <code>sudo apt-get install dnsmasq</code>
+Note that network-manager has a dependency on dnsmasq-base, which will block port 53. Hence, you may need to remove dnsmasq-base, e.g., with
+<code>sudo aptitude install dnsmasq dnsmasq-base-</code>
+you may need to reinstall dependencies that will be removed in the process.
+ref. http://ubuntuforums.org/showthread.php?p=12006425
 Changes in /etc/dnsmasq.conf:
@@ Line 34: / Line 58: @@
   - enable dnsmasq's built-in TFTP-server <code>enable-tftp</code>
   - set the root directory-for files available via TFTP. <code>tftp-root=/srv/tftp</code>
-  - download initramfs-kernel-image into root-directory of the TFTP-server: <code>!!! ADD_THE_FILE_HERE !!!</code>
+  - download initramfs-kernel-image into root-directory of the TFTP-server: <code>wget --directory-prefix=/srv/tftp http://downloads.openwrt.org/attitude_adjustment/12.09-beta2/ar71xx/nand/openwrt-ar71xx-nand-vmlinux-initramfs.elf</code>
   - set filename of kernel image for tftp-server/BOOTP:<code>dhcp-boot=/srv/tftp/openwrt-ar71xx-nand-vmlinux-initramfs.elf</code>
 Finally restart dnsmasq
 <code>sudo /etc/init.d/dnsmasq restart</code>
 === Setup the Routerboard ===
@@ Line 102: / Line 125: @@
 Press **Enter** and you are in the console of OpenWRT running from RAM and booted via BOOTP/TFTP.
+Note that you may need to set dns servers to get net-access while running the netbooted image. Enter a working dns for you in
+<code>vi /tmp/resolv.conf.auto</code>
+then restart dnsmasq to make the change effective (cross-check that you indeed have net-access afterwords):
+<code>/etc/init.d/dnsmasq restart</code>
 ==== Permanent Installation ====
@@ Line 122: / Line 150: @@
   - Execute:
 <code>
-wget2nand http://downloads.openwrt.org/attitude_adjustment/12.09-beta/ar71xx/nand/
+wget2nand http://downloads.openwrt.org/attitude_adjustment/12.09/ar71xx/nand/
 </code>
-You can adjust the path-part dependend on the OpenWRT-version ('attitude_adjustment/12.09-beta'), but make sure you use the 'ar71xx/nand/'-branch and at least version '12.09-beta'.
+You can adjust the path-part dependend on the OpenWRT-version ('attitude_adjustment/12.09'), but make sure you use the 'ar71xx/nand/'-branch and at least version '12.09-rc2'.
 ==== Upgrading OpenWrt ====
@@ Line 174: / Line 202: @@
 ==== Micro-SD-Card-Reader ====
-ToDo
+The SD-card reader is now supposed to work, but the needed patch is currently not in trunk. You will find the ticket with history here: https://dev.openwrt.org/ticket/12349
+Hence precompiled images with working SD-card reader is not yet available from the OpenWrt server. Until that is resolved, you can find compiled kernel and rootfs here:
+http://ubuntuone.com/1bZTk4vlKwroZezcdeJa4l
+http://ubuntuone.com/2V1BoearwvvMOsNzUz7mcx
+Provide them on a web-server, or copy them manually over to the kernel and rootfs partitions on the nand.
 ==== USB ====
+The USB-port of the RB493G is a **shameful chapter of Mikrotik engineering**.
+The USB-standard demands a 5VDC-power-supply on the USB-socket, but Mikrotik tried to save a few cents for a voltage converter. So one has to buy a power-injector from Mikrotik and any 5VDC-power-supply. Pray the plug of your power-supply fits into the power-injector! Just using a powered USB-hub doesn't solve the problem, as USB-hubs only enumerate/register with the host-controller when 5VDC is supplied by the host-controller.
+Reliable vendors just update their PCB-layout, but Mikrotik sells that **non-standard/sub-standard** PCB-layout **for years**, now.
 The Routerboard has a OHCI-controller for USB 1.x and a EHCI-controller for USB 2.0.
 See [[doc:howto:usb.essentials]] for configuration.
 ===== Hardware =====
@@ Line 192: / Line 231: @@
 | **[[doc:hardware:soc|System-On-Chip]]:**  | Atheros AR7161 rev 2 |
 | **[[doc:hardware:cpu|CPU]]/Speed**        | MIPS 24Kc rev 00019374 680/800 Mhz |
-| **Flash-Chip:**      | [[|ST NAND01GW3B2CN6]] |
+| **Flash-Chip:**      | [[Samsung NAND 128MiB 3,3V 8-bit]], [[ST Micro NAND01GW3B2CN6]] or [[Toshiba NAND 128MiB 3,3V 8-bit]] |
 | **Flash size:**      | 128 MiB NAND-Flash |
 | **Micro-SD:**        | 1x Micro-SD-socket (probably SPI) |
 | **RAM:**             | 256 MiB DDR-SDRAM |
 | **Wireless:**        | optional via 3x Mini-PCI IIIA/B |
-| **Ethernet:**        | 9x 10/100/1000Base-T(X) (1x Atheros AG71xx  + 2x Atheros AR8316-4-port-switch w/ vlan support [[doc:techref:swconfig]] |
+| **Ethernet:**        | 9x 10/100/1000Base-T(X) (2x Atheros AR8316-5-port-switch with VLAN support [[doc:techref:swconfig]] |
 | **Internet:**        | n/a/xDSL/DOCSIS/3g/LTE  |
 | **USB:**             | 1x 2.0 (unpowered) |
@@ Line 314: / Line 353: @@
 {{tag>GigabitEthernet FastEthernet 9Port 2PHY USB DetachableAntenna 256RAM 128Flash MIPS MIPS32 24Kc}}
+===== Hardware Mods =====
+  - as a beginner, you really should inform yourself about [[doc:hardware:soldering]] in general and then even obtain some experience!
+==== USB-MOD ====
+Components:
+| 1x | PCB |
+| 1x | USB-2.0-dual-A-socket, e.g., [[http://dx.com/p/diy-dual-usb-female-type-a-180-degree-dip-socket-connector-silver-10-piece-pack-127653 | |these]]. |
+| 1x | USB-2.0- A-plug, e.g., [[http://dx.com/p/diy-usb-4-pin-female-type-a-smt-socket-connector-silver-10-piece-pack-127642 | these]]. |
+| 1x | Traco TSR 1-2450 step-down-converter 5VDC/1A (doesn't need any other components like capacitors or heatsink). As of this writing you will find the LM7805V voltage regulator at [[http://dx.com/p/lm7805l-5v-voltage-regulator-ics-10-pcs-157382 | DealExtreme]] |
+| 1x | Multifuse 60VDC/0,5A I<sub>hold</sub>/1A I<sub>trip</sub> |
+Proto-type and diagrams/layouts aren't beauties, but maybe someone with more Cadsoft-Eagle-experience can make a nice circuit-diagram and a real PCB-layout. {{:toh:mikrotik:rb493g-usb-mod.zip|Eagle files and datasheets}} ;-)
+Rudimentary circuit-diagram with USB-2.0 data-port (1) and generic USB-2.0 charger port (2), both supplied by a step-down-converter via the fan-connector of the RB493G:
+{{:toh:mikrotik:rb493g_usb-mod_circuit-diagram.png|}}
+Rudimentary PCB-layout, not applicable:\\
+{{:toh:mikrotik:rb493g-usb-mod_pcb.png|}}
+USB-mod prototype top-view:\\
+{{:toh:mikrotik:usb-mod-top.jpg|}}
+USB-mod prototype bottom-view:\\
+{{:toh:mikrotik:usb-mod-bottom.jpg|}}
+USB-mod prototype attached:\\
+{{:toh:mikrotik:usb-mod-attached.jpg|}}

toh/mikrotik/rb493g.1348784585.txt.bz2 · Last modified: 2012/09/28 00:23 by renne

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