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Diffstat (limited to 'doc/README.standalone')
| -rw-r--r-- | doc/README.standalone | 22 |
1 files changed, 12 insertions, 10 deletions
diff --git a/doc/README.standalone b/doc/README.standalone index 3998831..81b949a 100644 --- a/doc/README.standalone +++ b/doc/README.standalone @@ -19,11 +19,12 @@ 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: r2 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 +50,12 @@ 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: |