-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1 On 08/19/2013 01:33 PM, Måns Rullgård wrote: > Scott Wood <scottw...@freescale.com> writes: [snip] >> i960 is a bad analogy. It's often possible to turn arm32 asm >> into arm64 asm with some search and replace and minor manual >> fixups. > > Only if the original uses none of the distinguishing features of > ARM like predicated instructions or variably shifted operands. > Once you limit yourself to the remaining basic operations, every > (RISC) architecture looks the same. [snip] > AArch64 of course shares certain non-ISA aspects with AArch32. > Page table formats and other architecturally defined system control > features are the same, and code for managing these things should of > course be shared. Some other features, e.g. exception handling, > are different enough that sharing code is probably difficult. > > There is a tendency to see arm64/aarch64 as yet another 64-bit > extension of a 32-bit architecture, which it is not. Assuming that > software support will or can follow the model used by the others > mentioned is thus a mistake.
We don't have lots of hand-crafted assembly, and what we do, we largely have split out already into the cpu directories. I really think we just need to try this and see how it goes. - -- Tom -----BEGIN PGP SIGNATURE----- Version: GnuPG v1.4.11 (GNU/Linux) Comment: Using GnuPG with Thunderbird - http://www.enigmail.net/ iQIcBAEBAgAGBQJSElt6AAoJENk4IS6UOR1Wnr0P/jvHsmIm6WecndYXa6aA6BjD 9SSSFzdvwvm7qZShmgu+dwJNPzPVbYXLi+N9BvuTotcl/aVNthNsDI/LQfFQUQwe 8GimYa5OpzHKCqP18CGgGC/egKv6+RnMzxcjFPx3G3BSUzC7iqVmQLv3+5n6uj4h /f+TqXUDY4ej6htRTH6DmEHK+UMstOATokVuoqQO5Yoezx5fZfCUvPhAcgMnYcuT VBD1rr/fB+06k3GpZJpUMi3sfGZDc0G9AaVY7kC6dRA1IfSgt8GJi0E+qOe0hdDH sMNWV1jRtyUj3NXUbngESnOgTlM4rx5eWGhlI4XWmWqTvr8r7wS5fJoEFJEDUHQM kX2Z7h7Cl9qY1FbrT9HYOghKwVIW8APhNpVcq5YefZx5S44wAn/tQBUr3PD0+oDl AWc8rL7AtXXNwwGE2qL1sh1rDHBGFi5d7zjlXhdSZO2FOpMqC6k0GsEZ65adVuxH hJ8zdrkzAQNNaTI+ggctUZP7YEkyWnslRNgBEnNH1IW0X+ChVvyRwkISOVcq2wCB YYGo5JUs4daQ1VXLeu1ZKD1p9R2ogigTI/wvLl1We2nJvY4uKLxok56T+kKw1fAc N4RAwiGr9Mu8b/zs21+Tyd6iDdzIfcOvraUsb0cQPHifM4usQMc4c3TKDvnWbj3i EAMFOVAXA7JteO6JVXRA =6mM2 -----END PGP SIGNATURE----- _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
