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Re: [crosstool-ng/crosstool-ng] 1f5906: samples: add aarch64-rpi3-linux-gnueabi

From: "Richard Earnshaw (lists)" <Richard dot Earnshaw at arm dot com>
To: mike at raspberryvi dot org, crossgcc at sourceware dot org
Date: Fri, 4 Mar 2016 10:25:56 +0000
Subject: Re: [crosstool-ng/crosstool-ng] 1f5906: samples: add aarch64-rpi3-linux-gnueabi
Authentication-results: sourceware.org; auth=none
References: <56d870b18e978_31e63fb5b061d2bc23875 at hookshot-fe5-cp1-prd dot iad dot github dot net dot mail> <56D89FA5 dot 6080208 at raspberryvi dot org>

On 03/03/16 20:33, Mike Ray wrote:
> Foundation forum mods and developers haven't mentioned whether
> boot-loader needs to be 64-bit as well.

In common with other 64-it systems, like x86 for example, to run a
64-bit application you need a 64-bit operating system, and to run a
64-bit operating system you need a 64-bit boot-loader.

The privilege levels in the system only support running 64-bit at one
privilege level if the level above it is running at 64-bit; and you can
only switch states as you enter a privilege level, so if your top-level
boot code isn't 64-bit you'll never be able to get back to that state.

R.

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References:
- [crosstool-ng/crosstool-ng] 1f5906: samples: add aarch64-rpi3-linux-gnueabi
  - From: Bryan Hundven
- Re: [crosstool-ng/crosstool-ng] 1f5906: samples: add aarch64-rpi3-linux-gnueabi
  - From: Mike Ray

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