diff options
Diffstat (limited to 'Documentation/boards/at91.rst')
-rw-r--r-- | Documentation/boards/at91.rst | 51 |
1 files changed, 51 insertions, 0 deletions
diff --git a/Documentation/boards/at91.rst b/Documentation/boards/at91.rst new file mode 100644 index 0000000000..f25cb01bb1 --- /dev/null +++ b/Documentation/boards/at91.rst @@ -0,0 +1,51 @@ +Microchip (Atmel) AT91 +====================== + +The Microchip (former Atmel) AT91 architecure has very good support within +barebox. +Most boards today have their description in their board files, but +boards are slowly migrating to use DT. +Likewise most boards are not yet migrated to multi image support, but +this is also ongoing. + +The boot process of the AT91 CPU's is a two step process. +The first step is named the bootstrap and at91bootstrap +is often used (https://github.com/linux4sam/at91bootstrap). +barebox supports bootstrapping some at91 boards as documented +in the following. + +The bootstrap program are loaded by a boot program and can be loaded +from DataFlash, NAND Flash, SD Card or via USB. +The bootstrap program do the low-level configuration of the +processor and then load and execute barebox. + +AT91 boards +----------- +The majority of the supported boards have a short entry here. +For each board defconfig file(s) are noted but barebox may include additional +defconfig files and may also include boards not included in the following. + +.. toctree:: + :glob: + :maxdepth: 1 + + at91/* + +TODO +---- +This is a list of AT91 specific TODO items, listed in no particular order. + +* fix prototype for barebox_arm_reset_vector. Introduce the prototype: + +.. code-block:: c + + void __naked __bare_init barebox_arm_reset_vector(uint32_t r0, uint32_t r1, uint32_t r2) + + +This will unify the prototype for the reset vector for multi image and standalone images + +* Update remaining boards to DT +* Update remaing boards to support multi image boot +* Get bootstrap working in combination with multi image +* Introduce defaultenv2 for all boards +* Add pwm driver (required to support backlight) |