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qemu.bbclass: clarify QEMU_EXTRAOPTIONS

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QEMU_EXTRAOPTIONS is a way to add PACKAGE_ARCH specific options to the
qemu_run_binary qemu commandline. The base QEMU_EXTRAOPTIONS variable
(ie without a PACKAGE_ARCH suffix) is not used, so defining it, either
directly or via an over-ride has no effect.

Although previously an over-ride for _armv7a was used, it did nothing
for most armv7a builds, which typically use PACKAGE_ARCH values such
as "cortexa9hf-neon". In practice this worked OK since without a -cpu
option, qemu-arm will default to emulating a CPU which supports all
required architecture levels.

qemu-arm (v2.5.0) with no -cpu option has been confirmed to
successfully run binaries built for armv7ve.

(From OE-Core rev: 62b25b3489b44969e4adad657daebfaffdb4de56)

Signed-off-by: Andre McCurdy <armccurdy@gmail.com>
Signed-off-by: Ross Burton <ross.burton@intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Andre McCurdy
2016-01-27 12:58:51 -08:00
committed by Richard Purdie
parent 3dca294d8e
commit f80d16e4d3
1 changed files with 9 additions and 7 deletions
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16
meta/classes/qemu.bbclass
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@@ -35,18 +35,20 @@ def qemu_run_binary(data, rootfs_path, binary):
+ " -E LD_LIBRARY_PATH=" + libdir + ":" + base_libdir + " "\
+ rootfs_path + binary
# QEMU_EXTRAOPTIONS is not meant to be directly used, the extensions are
# PACKAGE_ARCH, not overrides and hence have to do this dance. Simply being arch
# specific isn't good enough.
# QEMU_EXTRAOPTIONS is not meant to be directly used, the extensions are
# PACKAGE_ARCH, *NOT* overrides.
# In some cases (e.g. ppc) simply being arch specific (apparently) isn't good
# enough and a PACKAGE_ARCH specific -cpu option is needed (hence we have to do
# this dance). For others (e.g. arm) a -cpu option is not necessary, since the
# qemu-arm default CPU supports all required architecture levels.
QEMU_OPTIONS = "-r ${OLDEST_KERNEL} ${@d.getVar("QEMU_EXTRAOPTIONS_%s" % d.getVar('PACKAGE_ARCH', True), True) or ""}"
QEMU_OPTIONS[vardeps] += "QEMU_EXTRAOPTIONS_${PACKAGE_ARCH}"
QEMU_EXTRAOPTIONS_iwmmxt = " -cpu pxa270-c5"
QEMU_EXTRAOPTIONS_armv6 = " -cpu arm1136"
QEMU_EXTRAOPTIONS_armv7a = " -cpu cortex-a8"
QEMU_EXTRAOPTIONS_ppce500v2 = " -cpu e500v2"
QEMU_EXTRAOPTIONS_ppce500mc = " -cpu e500mc"
QEMU_EXTRAOPTIONS_ppce5500 = " -cpu e5500"
QEMU_EXTRAOPTIONS_ppc64e5500 = " -cpu e5500"
QEMU_EXTRAOPTIONS_ppce6500 = " -cpu e6500"
QEMU_EXTRAOPTIONS_ppc64e6500 = " -cpu e6500"
QEMU_EXTRAOPTIONS_ppc7400 = " -cpu 7400"
QEMU_EXTRAOPTIONS_ppc7400 = " -cpu 7400"