FWIW, on linux as long as CONFIG_COMPAT is enabled, you can run both AArch64/32 userspace programs. But the mode switching is done at an exception level, so you can't interlink 64 and 32bit programs (unlike intermixing mips16 and mips32, or thumb and arm code).
I had worked on the Pixel C, on that platform you get both 64 and 32bit set of libraries in the filesystem. On jetson tx1 would be the same. David ________________________________________ From: Andreas Färber <afaer...@suse.de> Sent: Tuesday, September 13, 2016 7:31 AM To: Jiri Kastner Cc: Duane Ellis; Alexander Graf; openocd-devel Subject: Re: [OpenOCD-devel] OpenOCD AArch64 support Am 13.09.2016 um 15:53 schrieb Jiri Kastner: > On Tue, Sep 13, 2016 at 01:15:03PM +0200, Andreas Färber wrote: >> Am 13.09.2016 um 11:44 schrieb Jiri Kastner: >>> jetson tx1: >>> userspace part of linux4tegra for jetson tx1 releases are both, armv7hl >>> and aarch64, while kernel is compiled for aarch64, so i guess tegra >>> downstream kernel has appropriate code for switching from aarch64 to >>> aarch32. >> >> That surely has nothing to do with downstream, any arm64 kernel can run >> aarch32 code on hardware that supports it. ThunderX among others does not. > > tx1 != thunderx. [...] I know. My point was about "downstream" - running AArch32 code on arm64 will be generic code, no Nvidia magic, so Matthias can look at upstream source. The Andromeda Box Edge and Odroid-C2 also run a 32-bit userland. ThunderX was the only exception to the rule I could think of, name similarity is purely coincidental. As for the Tegra X1, you may find this interesting: ftp://download.nvidia.com/tegra-public-appnotes/t210-nvtboot-flow.html Regards, Andreas -- SUSE Linux GmbH, Maxfeldstr. 5, 90409 Nürnberg, Germany GF: Felix Imendörffer, Jane Smithard, Graham Norton HRB 21284 (AG Nürnberg) ------------------------------------------------------------------------------ _______________________________________________ OpenOCD-devel mailing list OpenOCD-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openocd-devel ----------------------------------------------------------------------------------- This email message is for the sole use of the intended recipient(s) and may contain confidential information. Any unauthorized review, use, disclosure or distribution is prohibited. If you are not the intended recipient, please contact the sender by reply email and destroy all copies of the original message. ----------------------------------------------------------------------------------- ------------------------------------------------------------------------------ _______________________________________________ OpenOCD-devel mailing list OpenOCD-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openocd-devel
