Property:RTL86

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Chip-Codename

Codename:	RTL86	Wiki	Freetz	IPPF	whmf	PDF	Web
Creator:	Realtek	Wiki	Freetz	IPPF	whmf	PDF	Web
Vendor:	Realtek	Wiki	Freetz	IPPF	whmf	PDF	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 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
FRITZ!Box 7530 v2	RTL8275, RTL8685SB	NT5CC128M16JR-EK	MX30LF1G28AD-TI		LM324, BCP53-16	SC14448-B96R101QNC	IPQ4019-2VV	QCA8075-0VV
2 RTL86 models

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.

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