Libertas

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Libertas is the codename for the Marvel 88w838X series of wireless chipsets, and also refers to the firmware for them.

Hardware parts

Baseband Processor Product Selection table
Part no. examples b/g/a Package option CLK Type Interface Feature/Advantage
88W8305  ? b TQFP 128pin 14x14x1.2
TBGA no option
Flip chip Yes
20, 40, 44 CMOS only CF SDIO (SPI) TKIP (firmware) AES (hardware) WPA (firmware) Power Save
88W8381  ? b TQFP 128pin 14x14x1.2
TBGA 132pin 8x8x1
Flip chip Yes
19.2, 20, 26, 38.4, 40, 44 COMS & Low swing sine wave CF SDIO (SPI) 8305 + TKIP (hardware) 802.11e (QoS) 802.11i (Security) BT coex
88W8385 Gumstix a/b/g TQFP 128pin 14x14x1.2
TBGA 132pin 8x8x1
Flip chip Yes
19.2, 20, 26, 38.4, 40, 44 COMS & Low swing sine wave CF SDIO (SPI) Generic SPI 8381 + a/g
88W8388 XO, Xbox360 a/b/g TQFP No
TBGA 132pin 8x8x1
Flip chip Yes
19.2, 20, 26, 38.4, 40, 44 COMS & Low swing sine wave SDIO (SPI) USB 2.0 8385 + TCP/IP termination NAND Flash I/F Audio Codec I/F


RF transceiver Product Selection table
Part no. examples b/g/a Package option CLK Type Feature/Advantage
88W8010  ? b/g QFN 48pin 7x7x1
XFQFN 48pin 6x6x0.5
19.2, 20, 26, 38.4, 40, 44 CMOS On chip 2.4GHz PA
On chip Rx diversity
Tx power@pin = +22dBm@11b, +16dBm@11g
88W8015 XO, Gumstix b/g QFN 48pin 7x7x1
XFQFN 48pin 6x6x0.5
19.2, 20, 26, 38.4, 40 COMS & Low swing sine wave On chip 2.4GHz PA
Tx power@pin = +22dBm@11b, +16dBm@11g
Enhanced filtering for cellular handsets
Low swing sine wave CLK-in
88W8030/8031 Xbox360 (88W8030) a/b/g QFN 56pin 8x8x1
XFQFN
8030 40MHz crystal
8031 19.2, 20, 26, 38.4, 40, 44 COMS
On chip 2.4GHz PA / Need ext.PA for 5GHz
Tx power@pin = +22dBm@11b, +16dBm@11g, +0dBm@11a pre-Driver
8030 has internal OSC supply for BBP
88W8035/8036  ? a/b/g QFN no
XFQFN 56pin 7x7x0.5
8035 19.2, 20, 26, 38.4, 40 COMS & Low swing sine wave
8036 40MHz crystal
Need ext.PA for both 2.4GHz and 5GHz
Tx power@pin = +0dBm@pre-Driver
Enhanced filtering for cellular handsets
8036 has internal OSC supply for BBP
Low swing sine wave CLK-in


  • The OLPC XO laptop uses a 88w8388 baseband processor along with a 88w8015 rf transceiver connected via an internal USB interface.


Firmware

The Libertas firmware is separate from the XO-1's Open Firmware boot firmware.

  • As of November 2008, Ricardo Carrano recommends firmware version 22.p18.
  • There is a project to take the driver developed for the OLPC and utilized it for all of the libertas family including 88w8385 cf cards: http://projects.linuxtogo.org/projects/marvell8385/
  • Linux 2.6.24 will include support for 88w8385 (compact flash + sdio) mode and 88w8686 (sdio), using the OLPC driver.
  • There are still some issues regarding the openness of the firmware ticket #46
  • Discussions about how to open libertas firmware [1][2]
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