use C code rather than inline assembly

[karo-tx-uboot.git] / README

diff --git a/README b/README
index a5ffbb5ad15cad1cf5faef53566562b0b5cabaf4..d4afcfafea74c8d6bcf2f7253d77f169d1e4eb84 100644 (file)
--- a/README
+++ b/README
@@ -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