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soc:2008:stefanha:journal:week5 [2008/06/28 08:27]
stefanha
soc:2008:stefanha:journal:week5 [2008/06/30 10:03] (current)
stefanha
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 ==== Sat Jun 28 ==== ==== Sat Jun 28 ====
-Git commit: [[http://​git.etherboot.org/?​p=people/​stefanha/​gpxe.git;​a=commit;​h=3c923c79098190c12b686965d8bd48e1cedecd4d|[b44] DMA mapping for device address limitations]]+Git commit: 
 +  * [[http://​git.etherboot.org/?​p=people/​stefanha/​gpxe.git;​a=commit;​h=3c923c79098190c12b686965d8bd48e1cedecd4d|[b44] DMA mapping for device address limitations]] 
 +  * [[http://​git.etherboot.org/?​p=people/​stefanha/​gpxe.git;​a=commit;​h=87455683845a6694fdc89cf986caa50571be8ef0|[b44] Fix DMA mapping]]
  
-**Working on DMA mapping**. ​ I have designed and implemented DMA mapping for gPXE see commit ​above.  ​Am currently writing tests and updating the b44 driver to make use of the new API.+**Working on DMA mapping**. ​ I have designed and implemented DMA mapping for gPXEsee commits ​above.  ​The b44 driver ​uses DMA mapping ​to work around ​the chip addressing limitations. ​ I am currently writing tests.
  
-I am done with the code but wanted to commit instead of keeping this out of tree.  Before submitting ​this for review I will break it up into several patches: +I am not done with the code but wanted to commit instead of keeping this out of tree.  Before submitting ​the code for review I will break it up into several patches: 
-  * **uhmalloc**,​ general-purpose external memory allocator. ​ Separates the ''​umalloc''​ heap from its memory allocator (which I call ''​uhmalloc''​). ​ The idea is that DMA mapping ​reuse ''​uhmalloc''​ to manage its DMA heap.+  * **uhmalloc**,​ general-purpose external memory allocator. ​ Separates the ''​umalloc''​ heap from its memory allocator (which I call ''​uhmalloc''​). ​ The idea is that DMA mapping ​reuses ​''​uhmalloc''​ to manage its DMA heap.
   * **DMA mapping** for transparently managing bounce buffers when needed by hardware. ​ The DMA mapping API provides a way to structure DMA transactions. ​ If the hardware has addressing limitations and is unable to access gPXE's heap, bounce buffers are used to communicate via regions of memory that the device has access to.   * **DMA mapping** for transparently managing bounce buffers when needed by hardware. ​ The DMA mapping API provides a way to structure DMA transactions. ​ If the hardware has addressing limitations and is unable to access gPXE's heap, bounce buffers are used to communicate via regions of memory that the device has access to.
-  * **b44 with DMA mapping**. ​ Update ​to the b44 code to use the DMA mapping API so it runs on machines with more than 1 GB of RAM.  This reverses the hack to place the gPXE heap at 4 MB into the physical address space.+  * **b44 with DMA mapping**. ​ Update b44 code using DMA mapping API so it runs on machines with more than 1 GB of RAM.  This reverses the hack to place the gPXE heap at 4 MB into the physical address space.
  
-Next steps: +===== Next week ===== 
-  * [b44] Performance. +On to [[.:week6|Week 6]]!
-  * [b44] Cleanup & testing. +
-  * [bzImage] Expand the heap size to the full 64K segment when loading a bzImage kernel with version 2.02 or higher. +
-  * [GDB] Update ​[[:​dev:​gdbstub|GDB stub page]] and screencast when UDP code is merged into mainline See [[http://​grub.enbug.org/​DebuggingWithGDB|GRUB GDB wiki page]] for inspiration. +
-  * [GDB] Real-mode remote debugging.+

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