~~NOCACHE~~
<embed en:templates:tabs_ptxdist_bootstrap>
  <label product_type>Embedded module</label>
  <label build_system_head>PTXdist</label>
  <label build_system>ptxdist</label>
  <label lang>en</label>
  <label mod_name>tqma53</label>
  <label mod_name_head>TQMa53</label>
  <label mod_arch>arm</label>
  <label bsp_name>Linux</label>
  <label bsp_name_head>Linux</label>
</embed>
\\
\\
===== Known Issues =====


===== MBa53x ======
==== RS485 ====
^ RS485 bus block in half-duplex mode  ^^
^ Affects   | RS485 via UARTx   |
^ Issue     | During i.MX53 reset the UARTx.CTS# pin is low by default (CPU internal pull down)  |
^ Effect    | Using the MBa53x RS485 circuitry in a half-duplex slave device or half-duplex multi-master environment may block the RS485 bus during i.MX53 reset.\\ The bus is released as soon as the UARTx.CTS# pin is properly configured by software (e.g. U-Boot, Linux, etc.)  |
^ Solution / Workaround  | Add a 10k pull up to the UARTx.CTS# signal on carrier board  |


----



==== eMMC drive strength  ====

  * **Affected Hardware**: TQMa53 Rev. 0400
  * **Impact**:\\ eMMC drive strength (card to host) is too high in card default configuration. This degrades signal integrity and has the potential to decrease the lifetime
  * **Solution**:\\ use only new linux / u-boot from BSP rev. 0108 or port the required changes to your bootloader / operating system.
  * **Details**:\\ <WRAP>
Starting with TQMa53 rev. 0400 a new eMMC type with better performance characteristics is used. This eMMC features a configurable drive strength (MMC CMD4 – SET_DSR, see JEDEC Standard No. 84-A441,  Table 22)

To keep signal integrity and prevent decreasing the lifetime of the processor the following configuration step for the eMMC must be implemented:
    * Write 0x0100 + 16 Stuff bits using CMD4 to the card everytime the card is selected using CMD7
\\
The current state of the changes needed in BSP Rev.0109 for:
    * u-boot 2013.01: all versions of the TQMa53 modifies device tree before booting linux to incorporate the correct dsr value for eMMC
    * linux 3.9 (TQMa53 + MBa53): value for dsr parsed from device tree property 
    * linux 3.11 (TQMa53 + TBa53): value for dsr parsed from device tree property 
    * barebox: 2012.07: (TQMa53 + MBa53): DSR support implemented, modifies device tree before booting linux to incorporate the correct dsr value for eMMC

To boot linux from barebox or an older u-boot version, you need to modify device tree to forward the dsr information to the kernel. 
Add property ''“tq,dsr”'' to the node "''/soc/aips@50000000/spba@50000000/esdhc@50020000''" with u32 value 0x0100

<WRAP center round important 60%>
ATTENTION: the usage of SET_DSR is strongly encouraged for TQMa53 Rev. 0400.
</WRAP>
 
</WRAP>


====== BSP ======


===== DVI support =====

  * **Affected Revisions**: 0102
  * **Issue**: DVI support works not as expected out of the box
  * **Solution**: \\ 1) BSP Revision 0103 fixes the issue. Update \\ 2) The files from {{ en:arm:tqma53:linux:OSELAS.BSP-TQ-TQMA53-hotfix-dvi.0102.tar.gz|this archive }} have to be copied to your BSP project. After the files are in the right place the following steps have to be executed: \\ <code>
ptxdist menuconfig
-> select "Enable DVI on startup"
-> Exit
-> Save Configuration
ptxdist go
ptxdist images
</code> 

===== Busybox / missing options for dd =====

  * **Affected Revisions**: up to 0104
  * **Issue**: dd applet does not support all options (for instance conv=fsync)
  * **Solution**: \\ 1) update BSP \\ 2) configure busybox and recompile \\ <code>
ptxdist menuconfig
-> select "Shell an Console Tools"
-> select "busybox"
-> select "Coreutils"
-> select "Enable ibs, obs and conv options"
-> Exit
-> Save Configuration
ptxdist go
ptxdist images
</code> 

===== u-boot 2013.01 =====

  * **Affected Revisions**: 0105
  * **Issue**: u-boot freezes when using command autocompletion
  * **Solution**: compile BSP only with configured toolchain


===== Barebox 2012.07 =====

  * **Affected Revisions**: 0102 / 0103
  * **Issue**: sporadic timeout errors when writing update to eMMC / SD-Card
  * **Solution**: \\ 1) update Barebox. Barebox in BSP Revision 0104 fixes the issue\\ 2) try to repeat the failed update

===== Linux =====

  * **Affected Revisions**: up to 0104
  * **Issue**: Pixelclock not working as set up in device tree
  * **Solution**: i.MX53 needs to have the serialize clock and the pixel clock with a fixed divider \\ Serializer clock is 7 x pixelclock for single channel LVDS (cf. table 8-5 of the i.MX53 Reference Manual), set up device tree accordingly or use newer BSP where kernel sets this automatically

  * **Affected Revisions**: up to 0104
  * **Issue**: USB Host loose devices if Ethernet in LAN9514 is active or external USB-to ethernet is used
  * **Solution**: update BSP

  * **Affected Revisions**: all
  * **Issue**: Audio chip SGTL5000 is not detected during boot up
  * **Solution**: The chip needs a clean power on reset. When booting via watchdog reset and switching / disabling the clock the chip locks sometimes. Under investigation.

  * **Affected Revisions**: all
  * **Issue**: only one SSI interface can be enabled and used
  * **Solution**: Limitation in device driver. Under investigation. [[support@tqs.de?subject=[Feature Request] TQMa53, Linux, multi channel SSI|please contact us]]  

  * **Affected Revisions**: 0103 - 0104
  * **Issue**: no sound with linux 3.5 on an Rev. 0300 module
  * **Solution**: update BSP

  * **Affected Revisions**: 0105
  * **Issue**: no sound with linux 3.9 on an Rev. 0200 module
  * **Solution**: [[.:how_to#use_audio_port| follow instructions]]

  * **Affected Revisions**: 0105
  * **Issue**: not all videos can be played smoothly
  * **Solution**: under investigation, see [[.:how_to#use_vpu_of_the_imx53 | here]] for further explanation

  * **Affected Revisions**: all
  * **Issue**: LVDS shows wrong color mapping with 18Bit / SPWG configuration
  * **Solution**: patch prepared for next revision

  * **Affected Revisions**: 0105, others unknown
  * **Issue**: NULL pointer exceptions from MMC driver stack and kernel panic during power up
  * **Solution**: patch prepared for next revision

====== PTXdist ======

===== PTXdist 2012.07 ====

  * **Issue**: Toolchain compilation fails in install-libs due to empty variable SHAREDLIBV in host-zlib Makefile
  * **Solution**: Always use the same PTXdist version as the toolchain project to compile a toolchain. (You can install multiple PTXdist versions parallel. Good way is to setup a link to the PTXdist version to use in the project)


===== PTXdist 2012.12 ====

  * **Issue** When installing ptxdist 2012.12.0 configure script gives the error ** configure: error: we need at least GNU sed 4.x**\\ 
  * **Solution** Version string of sed has been changed. To fix this overwrite line 3800 in the configure file with the following line :\\  
<code>
SED_VERSION=`$SED --version 2>/dev/null | $SED -ne "1 s/.*GNU.*\s\([0-9\+\.]\+\).*/\1/p"`
</code>

====== Toolchain =====

If you have compiler / compilation errors please contact us using our [[http://www.tq-group.com/en/support/support-form/|web formular]].

The following issues are known with OSELAS.Toolchains:

===== OSELAS.Toolchain-2011.11.<1 ... 3> =====

  * GCC version: 4.6.2: internal compiler error in package DirectFB (should be fixed in gcc 4.6.3)