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Property:RTL86
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Chip-Codename
Codename: | RTL86 | Wiki | Freetz | IPPF | whmf | Web | |
Creator: | Realtek | Wiki | Freetz | IPPF | whmf | Web | |
Vendor: | Realtek | Wiki | Freetz | IPPF | whmf | Web | |
Purpose: | DSL-SoC | ||||||
Description: | 1000MHz Quad Core MIPS32 / InterAptiv 34Kc Network SoC + VDSL frontend |
Chip-Details
RTL86 is the preliminary codename used here for the RTL8685
/ RTL8275
VDSL chipset, until a better codename is found.
This is originally a standalone router chipset used in many third party routers, like in this example design.
AVM uses it as the VDSL modem frontend of the FRITZ!Box 7520 v2 , the only model with CONFIG_DSL_RTL8685SB = 'y'.
There's no datasheet in the net about this chipset. Realtek only provides info for the old RTL8670 / RTL8270 ADSL chipset.
The RTL8685SB
is a networking SoC, the RTL8275
is the matching VDSL analog frontend.
According to this bootlog the RTL8685SB
is a quad core 1000 MHz SoC with this ID:
CPU0 revision is: 0001a120 (MIPS interAptiv (multi))
This is exactly the same ID the dual core Seale GRX and the quad core Falcon PRX chips report.
So this is likely also a dual core CPU with hyperthreading each, like the Falcon.
While AVM usually spends some RAM to a secondary CPU for the OS they did not do it in the 7520v2.
The following was my first assumption which is WRONG:
- Maybe they use the 1 MB
Scratchpad RAM
present in allInterAptiv
cores, which is freely configurable from 4kB to 1MB
to be Instruction Scratchpad
and/or Data Scratchpad
RAM, intended for systems that don’t have RAM.
- See chapter 6.2.1 of this PDF explaining
Linking for Scratchpad RAM
onInterAptiv
cores.
- 1 MB RAM is ok for some modem firmware, but not enough for a Linux (filesys+kernel+ram).
- That is why AVM runs all FRITZ!OS glue code on the main CPU of the 7520v2.
Fact is:
The 7520v2 runs a second linux for the Realtek frontend, located in linux.bin and booted by boot.bin.
It consists on a 2.7 MB LZMA compressed kernel which decompresses to 6.9 MB and a pretty compact 800 kB squashfs.
This requires at least 8 MB of RAM to boot. Either it's onchip memory or they found a way to share the RAM between both Linuxes (unlikely).
supportdata shows the Realtek specific modules rtl_nfbi.ko and rtk_atm.ko and the daemons avm2rtk_xdsld and controllerd.
More details once 7520v2 Firmware-Scans for both Linuxes are finished.
Chip-Variants
Chips using the codename or family name RTL86:
Selectors >> Components-Selector >> WLAN-Chips >> RTL86
Components-Selector | Cat. | Family | Coden. | Purpose | Iface | Creator | Vendor | Description |
---|---|---|---|---|---|---|---|---|
RTL8275 | SoC | RTL827x | RTL86 | DSL-PHY | Realtek | Realtek | VDSL Frontend for the RTL8685 | |
RTL8685SB | SoC | RTL868x | RTL86 | Network-SoC | Realtek | Realtek | 1000MHz Quad Core MIPS32 / InterAptiv 34Kc Network SoC | |
2 RTL86 chips |
Model-Matrix
Box-Models and Accessories using one of the RTL86 variants listed above:
Selectors >> Chips-Selector >> WLAN-Chips >> RTL86
Feature-Matrix
Features of Box-Models and Accessories using one of the RTL86 variants listed above:
S € |
Model Languages, Brandings |
Internet [Annex] |
LAN Ports |
WLAN 802.11 |
PSTN Lines |
Phones | SoC Clock |
RAM | Flash | USB Host |
Image |
---|---|---|---|---|---|---|---|---|---|---|---|
FRITZ!Box 7520 v2 de, en, es, fr, it, nl, pl 1und1, avm, avme |
SVect B, J USB-LTE WLAN |
100M: 2 Gbit: 2 |
866 Mb +400 Mb 2.4GHz 5GHz |
- | Analog: 1 DECT: 6 |
Dakota 717 MHz RTL86 1000 MHz |
256 MB | 128 MB | Ports: 1 USB: 2.0 |
||
FRITZ!Box 7530 v2 |
SVect USB-LTE WLAN |
Gbit: 4 |
866 Mb +400 Mb 2.4GHz 5GHz |
- | Analog: 1 DECT: 6 |
Dakota 717 MHz RTL86 1000 MHz |
256 MB | 128 MB | Ports: 1 USB: 3.0 |
- |
Legend:
- = all variants of this model are still supported
- = some variants of this model are end of support
- = all variants of this model are end of support
- = at least one variant of this model is still sold
- = no variant of this model is sold any more (or not yet)
- = a future model which is not yet sold or supported
This info is updated daily from the Part-Numbers section in each Box-Models article.
Gallery
If you want to extend the gallery with own work then please get in touch. See also the Photography-Inspiration article.