Date: Wed, 6 Aug 2014 01:41:57 GMT From: astarasikov@FreeBSD.org To: svn-soc-all@FreeBSD.org Subject: socsvn commit: r271981 - soc2014/astarasikov/head/sys/arm/goldfish Message-ID: <201408060141.s761fvD1022299@socsvn.freebsd.org>
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Author: astarasikov Date: Wed Aug 6 01:41:56 2014 New Revision: 271981 URL: http://svnweb.FreeBSD.org/socsvn/?view=rev&rev=271981 Log: [goldfish]: add a README on using Android Emulator Added: soc2014/astarasikov/head/sys/arm/goldfish/README Added: soc2014/astarasikov/head/sys/arm/goldfish/README ============================================================================== --- /dev/null 00:00:00 1970 (empty, because file is newly added) +++ soc2014/astarasikov/head/sys/arm/goldfish/README Wed Aug 6 01:41:56 2014 (r271981) @@ -0,0 +1,25 @@ +What is Goldfish Board? + It is a virtual ARM board provided by Android Emulator. + +What do I need to keep in mind? + I have literally spent more than a month hunting down various MMU bugs + that prevented FreeBSD from booting successfully on a Goldfish board. + + Turned out, Android Emulator's support for ARM1136 CPU lacked C13 CP15 + register used for TLS and PCPU. Emulating TLS via a + memory page at 0xffff0000 did not help much. Anyway, the emulator + supports emulating an ARMv7-compatible Cortex A8. + + I have not tracked down the exact difference in MMU management between + Linux and FreeBSD that caused random memory corruption on Goldfish. However, + it is known that FreeBSD works on QEMU with VERSATILEPB board. Unfortunately + the versions of Android Emulator from the SDK are based on an ancient QEMU + version that probably had some bug. Luckily, since Android-L preview release, + Google publishes prebuilt versions of Android Emulator from the latest source + code that do not have that bug. Please use the following the + "l-preview" branch from the following git repository: + https://android.googlesource.com/platform/prebuilts/android-emulator + +I can't find Android Emulator for FreeBSD! + Use the linux one. It works fine provided that you mount linprocfs at /proc + and install linux libraries (for example, linux_base-f10) including GTK
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