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| author | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
|---|---|---|
| committer | H. Nikolaus Schaller <hns@goldelico.com> | 2012-03-26 20:55:28 +0200 |
| commit | 92988a21ad4c4c9504295ccb580c9f806134471b (patch) | |
| tree | 5effc9f14170112450de05c67dafbe8d5034d595 /api/README | |
| parent | ca2b506783b676c95762c54ea24dcfdaae1947c9 (diff) | |
| download | bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.zip bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.gz bootable_bootloader_goldelico_gta04-92988a21ad4c4c9504295ccb580c9f806134471b.tar.bz2 | |
added boot script files to repository
Diffstat (limited to 'api/README')
| -rw-r--r-- | api/README | 55 |
1 files changed, 0 insertions, 55 deletions
diff --git a/api/README b/api/README deleted file mode 100644 index 6df225f..0000000 --- a/api/README +++ /dev/null @@ -1,55 +0,0 @@ -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 |