smallsolar/u-boot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

add some more Blackfin docs

Browse Source 
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
This commit is contained in:
Mike Frysinger
2008-02-04 19:26:54 -05:00
parent 32a9f5f216
commit 4c58eb5552
3 changed files with 62 additions and 10 deletions
Download Patch File Download Diff File Expand all files Collapse all files

21
doc/README.standalone
View File

@@ -19,11 +19,11 @@ Design Notes on Exporting U-Boot Functions to Standalone Applications:
thus the compiler cannot perform type checks on these assignments.
2. The pointer to the jump table is passed to the application in a
machine-dependent way. PowerPC, ARM and MIPS architectures use a
dedicated register to hold the pointer to the 'global_data'
structure: r29 on PowerPC, r8 on ARM and k0 on MIPS. The x86
architecture does not use such a register; instead, the pointer to
the 'global_data' structure is passed as 'argv[-1]' pointer.
machine-dependent way. PowerPC, ARM, MIPS and Blackfin architectures
use a dedicated register to hold the pointer to the 'global_data'
structure: r29 on PowerPC, r8 on ARM, k0 on MIPS, and P5 on Blackfin.
The x86 architecture does not use such a register; instead, the pointer
to the 'global_data' structure is passed as 'argv[-1]' pointer.
The application can access the 'global_data' structure in the same
way as U-Boot does:
@@ -49,11 +49,12 @@ Design Notes on Exporting U-Boot Functions to Standalone Applications:
4. The default load and start addresses of the applications are as
follows:
Load address Start address
x86 0x00040000 0x00040000
PowerPC 0x00040000 0x00040004
ARM 0x0c100000 0x0c100000
MIPS 0x80200000 0x80200000
Load address Start address
x86 0x00040000 0x00040000
PowerPC 0x00040000 0x00040004
ARM 0x0c100000 0x0c100000
MIPS 0x80200000 0x80200000
Blackfin 0x00001000 0x00001000
For example, the "hello world" application may be loaded and
executed on a PowerPC board with the following commands: