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SDK/Toolchains/Meetings/Notes20110131

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* Decisions:
* Decisions:
   * ''Compatibility baseline'' is armv7hl (ARM instruction set with VFPv3-D16)
   * ''Compatibility baseline'' is armv7hl (ARM instruction set with VFPv3-D16)
-
   * Optimized high performance is armv7tnhl (Thumb2 instruction set with NEON)
+
   * ''Optimized high performance'' is armv7tnhl (Thumb2 instruction set with NEON)
-
   * Optimized for N900 reference device is armv7nhl (ARM instruction set with NEON)
+
   * ''Optimized for N900 reference device'' is armv7nhl (ARM instruction set with NEON)
* Optimized high performance level means that it is allowed to Thumb2 instruction set and NEON instructions
* Optimized high performance level means that it is allowed to Thumb2 instruction set and NEON instructions

Revision as of 12:43, 31 January 2011

Contents

Date and Time

Monday 2011-01-31 @9.30 - 10.30 UTC

Participants

Al Nikolov, Martti Lumme, Juha Kallioinen, Carsten Munk, Jan-Simon Möller, Paavo Leinonen, Leonid Moiseichuk, Jarmo Kant

Agenda

  • Different architecture options regarding to Thumb2
  • Status
  • AOB

Different architecture options regarding to Thumb2

  • Lots of discussion around Thumb2 support in MeeGo 1.2
  • Currently there are four (4) different architectures in ARM hardfp for MeeGo 1.2 (armv7hl, armv7thl, armv7nhl, arnv7tnhl)
  • N900 is the reference device for MeeGo 1.2 handset but there is a silicon bug in Cortex-A8 processor that prevents using of Thumb2 instruction set (see http://cateee.net/lkddb/web-lkddb/ARM_ERRATA_430973.html)
  • Decisions: 
  * Compatibility baseline is armv7hl (ARM instruction set with VFPv3-D16)
  * Optimized high performance is armv7tnhl (Thumb2 instruction set with NEON)
  * Optimized for N900 reference device is armv7nhl (ARM instruction set with NEON)
  • Optimized high performance level means that it is allowed to Thumb2 instruction set and NEON instructions
Retrieved from "http://wiki.meego.com/SDK/Toolchains/Meetings/Notes20110131"
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