On Tuesday 13 September 2016 20:08:46 David Ung wrote: > 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.
What might (should?) work in my particular case is, since I'm starting from EL2: - Modify SPSR_EL2, setting bit 4 = 1 and bits 3:0 to some valid aarch32 mode (0x3 - svc mode) - set ELR_EL2 to a memory location with valid ARM code - "ERET" BR, Matthias > > 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 ------------------------------------------------------------------------------ _______________________________________________ OpenOCD-devel mailing list OpenOCD-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/openocd-devel
