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| author | Wolfgang Denk <wd@denx.de> | 2008-02-14 22:43:22 +0100 |
|---|---|---|
| committer | Wolfgang Denk <wd@denx.de> | 2008-02-14 22:43:22 +0100 |
| commit | e7670f6c1e52ae6d2a43ff75a8bcfa7a5c86e47b (patch) | |
| tree | c105ae64bb203f93e670ef11b3256a4a3086c0ad /doc | |
| parent | 3c234efa693bc59906c2be55c7918ecbb55392ea (diff) | |
| download | u-boot-imx-e7670f6c1e52ae6d2a43ff75a8bcfa7a5c86e47b.zip u-boot-imx-e7670f6c1e52ae6d2a43ff75a8bcfa7a5c86e47b.tar.gz u-boot-imx-e7670f6c1e52ae6d2a43ff75a8bcfa7a5c86e47b.tar.bz2 | |
PPC: Use r2 instead of r29 as global data pointer
R29 was an unlucky choice as with recent toolchains (gcc-4.2.x) gcc
will refuse to use load/store multiple insns; instead, it issues a
list of simple load/store instructions upon function entry and exit,
resulting in bigger code size, which in turn makes the build for a
few boards fail.
Use r2 instead.
Signed-off-by: Wolfgang Denk <wd@denx.de>
Diffstat (limited to 'doc')
| -rw-r--r-- | doc/README.standalone | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/doc/README.standalone b/doc/README.standalone index 3998831..f9237a6 100644 --- a/doc/README.standalone +++ b/doc/README.standalone @@ -21,7 +21,7 @@ Design Notes on Exporting U-Boot Functions to Standalone Applications: 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 + structure: r2 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. |