[Qemu-devel] [RFC v3 0/5] hw/arm: add initial support for Canon DIGIC SoC

[Antony Pavlov]

[RFC v3 1/5] hw/arm: add very initial support for Canon DIGIC SoC
[RFC v3 2/5] hw/arm/digic: prepare DIGIC-based boards support
[RFC v3 3/5] hw/arm/digic: add timer support
[RFC v3 4/5] hw/arm/digic: add UART support
[RFC v3 5/5] hw/arm/digic: add NOR ROM support

 Changes since v2:

 1. rebase over latest master;
   * pass available size to object_initialize().
 2. digic-uart: qemu_log: use LOG_UNIMP instead LOG_GUEST_ERROR;
 3. digic-boards: update rom image load code: introduce digic_load_rom().

 Changes since v1:

 0. drop the "add ARM946E-S CPU" patch;
 1. convert to QOM, split DIGIC SoC code and board code
 (thanks to Andreas Fa:rber, Peter Maydell and Peter Crosthwaite);
 2. fix digic-uart (many thanks to Peter Crosthwaite for his comments);
 3. digic-boards: digic4_add_k8p3215uqb_rom(): update rom image load code: use 
-bios option.


 DIGIC is Canon Inc.'s name for a family of SoC
 for digital cameras and camcorders.

 See http://en.wikipedia.org/wiki/DIGIC for details.

 There is no publicly available specification for
 DIGIC chips. All information about DIGIC chip
 internals is based on reverse engineering efforts
 made by CHDK (http://chdk.wikia.com) and
 Magic Lantern (http://www.magiclantern.fm) projects
 contributors.

 Also this patch series adds initial support for Canon
 PowerShot A1100 IS compact camera (it is my only camera
 with connected UART interface). As the DIGIC-based cameras
 differences mostly are unsignificant (e.g. RAM-size,
 ROM type and size, GPIO usage) the other compact
 and DSLR cameras support can be easely added.

 This DIGIC support patch series is inspired
 by EOS QEMU from Magic Lantern project.
 The main differences:
  * EOS QEMU uses home-brew all-in-one monolith design;
  this patch series uses conventional qemu object-centric design;
  * EOS QEMU tries provide simplest emulation for most
  controllers inside SoC to run Magic Lantern firmware;
  this patch series provide more complete support
  only for core devices to run barebox bootloader.
   ** EOS QEMU does not support timer counting
   (this patch series emulate 1 MHz counting);
   ** EOS QEMU support DIGIC UART only for output
   character to stderr; (this patch series emulate
   introduces full blown UART interface);
   ** EOS QEMU has incomplete ROM support;
   (this patch series uses conventional qemu pflash).

 This initial DIGIC support can't be used to run
 the original camera firmware, but it can successfully
 run experimental version of barebox bootloader
 (see http://www.barebox.org).

 The last sources of barebox for PowerShot A1100 can be
 obtained here:
   https://github.com/frantony/barebox/tree/next.digic.20130829

 The precompiled ROM image usable with qemu can be
 obtained here:

 
https://github.com/frantony/barebox/blob/next.digic.20130829/canon-a1100-rom1.bin

 This ROM image (after "dancing bit" encoding) can be run on
 real Canon A1100 camera.

 The short build instruction for __previous__ DIGIC barebox
 version (it can be used with more recent sources too) can
 be obtained here:
   http://lists.infradead.org/pipermail/barebox/2013-August/016007.html