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| author | Marian Balakowicz <m8@semihalf.com> | 2008-02-21 16:18:01 (GMT) |
|---|---|---|
| committer | Marian Balakowicz <m8@semihalf.com> | 2008-02-21 16:18:01 (GMT) |
| commit | 20c93959330aba8b5bbdbfde1ef319e99eba235d (patch) | |
| tree | ef82297e3aeb904f94584e6d136fac55ec32c317 /README | |
| parent | 5cf746c303710329f8040d9c62ee354313e3e91f (diff) | |
| parent | 928d1d77f8623c120d8763e20e1ca58df9c5c4c6 (diff) | |
| download | u-boot-fsl-qoriq-20c93959330aba8b5bbdbfde1ef319e99eba235d.tar.xz | |
Merge branch 'master' of /home/git/u-boot
Diffstat (limited to 'README')
| -rw-r--r-- | README | 9 |
1 files changed, 7 insertions, 2 deletions
@@ -3499,7 +3499,7 @@ GCC's implementation. For PowerPC, the following registers have specific use: R1: stack pointer - R2: TOC pointer + R2: reserved for system use R3-R4: parameter passing and return values R5-R10: parameter passing R13: small data area pointer @@ -3508,7 +3508,7 @@ For PowerPC, the following registers have specific use: (U-Boot also uses R14 as internal GOT pointer.) - ==> U-Boot will use R29 to hold a pointer to the global data + ==> U-Boot will use R2 to hold a pointer to the global data Note: on PPC, we could use a static initializer (since the address of the global data structure is known at compile time), @@ -3517,6 +3517,11 @@ For PowerPC, the following registers have specific use: average for all boards 752 bytes for the whole U-Boot image, 624 text + 127 data). +On Blackfin, the normal C ABI (except for P5) is followed as documented here: + http://docs.blackfin.uclinux.org/doku.php?id=application_binary_interface + + ==> U-Boot will use P5 to hold a pointer to the global data + On ARM, the following registers are used: R0: function argument word/integer result |