Group: Hardware/Computers/Tablets

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(comparaison of chipsets: move to Group:Hardware/Components/SOCs)
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* ath9k-htc (USB) The think penguin version requires 500mA, no device will work with known Replicant tablets supporting only 100mA or 200mA: AR9271 itself needs ~200mA, Unex DNUA-93F (rebranded by Tehnoetic and Think Penguin?) can use 300mA
 
* ath9k-htc (USB) The think penguin version requires 500mA, no device will work with known Replicant tablets supporting only 100mA or 200mA: AR9271 itself needs ~200mA, Unex DNUA-93F (rebranded by Tehnoetic and Think Penguin?) can use 300mA
 
==== SOC ====
 
==== SOC ====
{| class="wikitable"  border="1"
+
See [[Group:Hardware/Components/SOCs|the page on SOCs]] for more details.
! Manufacturer
 
! SOC
 
! GPU
 
! Bootloader status
 
! USB host
 
! (mini)PCI(e) possible?
 
! Minimum quantity required
 
|-
 
! Texas instruments
 
! DM370(like omap3 but higher speed)
 
| <span style="background:red">Powervr</span>
 
| <span style="background:green">good (free software unsigned possible)</span>
 
| {{yes}}
 
| Seem not
 
| ?
 
|-
 
! Texas instruments
 
! omap4
 
| <span style="background:red">Powervr</span>
 
| <span style="background:green">good (free software unsigned possible)</span>
 
| {{yes}}
 
| Seem not
 
| ?
 
|-
 
! Allwinner Tech
 
! A31
 
| <span style="background:red">Powervr</span>
 
| <span style="background:green">good (free software unsigned possible)</span>
 
| {{yes}}
 
| ?
 
| ?
 
|-
 
! Allwinner Tech
 
! A10,A10s,A13,A20
 
| Mali
 
| <span style="background:yellow">good (free software unsigned possible, requires SD-card)</span>
 
| {{yes}}
 
| ?
 
| ?
 
|-
 
! Samsung
 
! Exynos 3 Single -> Exynos 5 dual
 
| Mali
 
| <span style="background:red">bad (part of it is software, non-free and signed on all known devices)</span>
 
| {{yes}}
 
| ?
 
| ?
 
|-
 
! Samsung
 
! Exynos 5 Octa
 
| <span style="background:red">Powervr</span>
 
| ?
 
| ?
 
| ?
 
| ?
 
|-
 
! Freescale
 
! I.MX6
 
| <span style="background:yellow">Vivante, partially supported by etna_viv; VPU with nonfree firmware</span>
 
| unknown, was good on previous versions of the chip
 
| {{yes}}
 
| {{yes}}
 
| ?
 
|-
 
! Ingenic
 
! JZ4760
 
| Vivante GC200
 
| Free
 
| Yes
 
| ?
 
| 1
 
|}
 
  
 
== see also ==
 
== see also ==
 
* [[Group:Hardware/Processors]]
 
* [[Group:Hardware/Processors]]
 +
 +
[[Category:Hardware]]

Revision as of 22:18, 12 October 2019

John's braindump:

The FSF wants to do something to make a completely free tablet a reality.

An important step here is the video hardware. Some chipsets have free drivers, but rely on proprietary firmware. The FSF is considering a project to replace this proprietary firmware with free firmware.

1) We should choose a chipset that is very new, so that the product will still be useful for some time.

2) We should choose something that is used in many different products, if possible.

3) We should choose something that is present in products that have the best chance of being fully free otherwise. If it has a USB port, it can get free wifi that way, for example.

4) We should pursue better relations with manufacturers to get documentation at least, or in the best case to convince them based on our reverse engineering success to do the right thing from the beginning.

We may start with an eink reader, because it's much easier to do, it would be a big step, and it would build momentum toward doing a full tablet.

We are chatting about the project in #fsf-tablet on irc.oftc.net.

About Lima: https://fosdem.org/2013/schedule/event/operating_systems_open_arm_gpu/

comparaison of chipsets

Wifi

Recent enough chipsets/drivers that could be used are:

  • ath9k (mini-pcie) if the SOC has a PCI lane
  • ath9k-htc (USB) The think penguin version requires 500mA, no device will work with known Replicant tablets supporting only 100mA or 200mA: AR9271 itself needs ~200mA, Unex DNUA-93F (rebranded by Tehnoetic and Think Penguin?) can use 300mA

SOC

See the page on SOCs for more details.

see also