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-U-Boot machine/arch independent API for external apps
-=====================================================
-
-1.  Main assumptions
-
-  - there is a single entry point (syscall) to the API
-
-  - per current design the syscall is a C-callable function in the U-Boot
-    text, which might evolve into a real syscall using machine exception trap
-    once this initial version proves functional
-
-  - the consumer app is responsible for producing appropriate context (call
-    number and arguments)
-
-  - upon entry, the syscall dispatches the call to other (existing) U-Boot
-    functional areas like networking or storage operations
-
-  - consumer application will recognize the API is available by searching
-    a specified (assumed by convention) range of address space for the
-    signature
-
-  - the U-Boot integral part of the API is meant to be thin and non-intrusive,
-    leaving as much processing as possible on the consumer application side,
-    for example it doesn't keep states, but relies on hints from the app and
-    so on
-
-  - optional (CONFIG_API)
-
-
-2. Calls
-
-  - console related (getc, putc, tstc etc.)
-  - system (reset, platform info)
-  - time (delay, current)
-  - env vars (enumerate all, get, set)
-  - devices (enumerate all, open, close, read, write); currently two classes
-    of devices are recognized and supported: network and storage (ide, scsi,
-    usb etc.)
-
-
-3. Structure overview
-
-  - core API, integral part of U-Boot, mandatory
-    - implements the single entry point (mimics UNIX syscall)
-
-  - glue
-    - entry point at the consumer side, allows to make syscall, mandatory
-      part
-
-    - helper conveniency wrappers so that consumer app does not have to use
-      the syscall directly, but in a more friendly manner (a la libc calls),
-      optional part
-
-  - consumer application
-    - calls directly, or leverages the provided glue mid-layer