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Property:RTL86

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Chip-Codename

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 all InterAptiv 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 on InterAptiv 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

Chips-Selector SoC RAM Flash FPGA FON DECT WLAN LAN USB PSU Misc
FRITZ!Box 7520 v2 RTL8275, RTL8685SB NT5CC128M16JR-EK MX30LF1G28AD-TI LM324, BCP53-16 SC14448-B96R101QNC IPQ4019-2VV QCA8075-0VV
1 RTL86 model

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
ok
sold
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 7520 v2-Image41.jpg

Legend:

  • ok = all variants of this model are still supported
  • part = some variants of this model are end of support
  • eos = all variants of this model are end of support
  • sold = at least one variant of this model is still sold
  • dead = no variant of this model is sold any more (or not yet)
  • todo = 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.

SMW-Browser

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Synonyms

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