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authorMike Frysinger <vapier@gentoo.org>2008-02-04 19:26:54 -0500
committerMike Frysinger <vapier@gentoo.org>2008-02-04 19:26:54 -0500
commit4c58eb5552220e425c8af6ac8d2839244a2f57b1 (patch)
tree4c98c4e1f2511d3f15c88e439c3af4e2991e1de4 /doc/README.standalone
parent32a9f5f2160a034ea87ea651b233ef7c635e55cf (diff)
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add some more Blackfin docs
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Diffstat (limited to 'doc/README.standalone')
-rw-r--r--doc/README.standalone21
1 files changed, 11 insertions, 10 deletions
diff --git a/doc/README.standalone b/doc/README.standalone
index 3998831..3495f54 100644
--- a/doc/README.standalone
+++ b/doc/README.standalone
@@ -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: