Hello Terry, U-boot is in thumb mode and the THUMB mode application generates "undefined instruction" exception. U-boot is in thumb mode and an ARM mode application is running fine in this environment.
Thank you. Regards, Parimala On Fri, Dec 20, 2013 at 10:40 AM, Terry Guo <terry....@arm.com> wrote: > My understanding is that your u-boot is built in THUMB mode and also run > in THUMB mode now, but your helloworld application is still ARM code. Then > under thumb mode u-boot, you issue command “go 82000000 hello” to run an > ARM application. Is my understanding correct? > > > > If correct, my gut feeling is it might be a problem related to ARM/Thumb > mode switch. > > > > BR, > > Terry > > > > *From:* Parimala Baggiri [mailto:baggiriparim...@gmail.com] > *Sent:* Friday, December 20, 2013 12:25 PM > *To:* Zhenqiang Chen > *Cc:* linaro-toolchain; Terry Guo > *Subject:* Re: ARM vs THUMB builds > > > > When I build hello_world application along with u-boot for ARM mode, it > executes fine on target, But, when I build it for THUMB mode, it generates > "undefined instruction" exception. > > Thank you. > > > > > > On Fri, Dec 20, 2013 at 8:38 AM, Zhenqiang Chen <zhenqiang.c...@linaro.org> > wrote: > > On 19 December 2013 13:36, Parimala Baggiri <baggiriparim...@gmail.com> > wrote: > > Hello, > > > > I am using the pre-built toolchain gcc-arm-none-eabi-4_6-2012q2 from > linaro > > to compile u-boot (u-boot-linaro-stable) and to compile my standalone > > applications to run on target(PandaBoard ES rev b2) > > > > hello_world standalone application which comes with u-boot is executing > fine > > on target when I disable CONFIG_SYS_THUMB_BUILD, but when I enable it, > > target gets reset with following information > > How do you build your hello_world? Is it ARM or THUMB? > > > > Panda # go 82000000 hello > > ## Starting application at 0x82000000 ... > > undefined instruction > > pc : [<8200000c>] lr : [<bff83147>] > > sp : bfeffe40 ip : bfeffc10 fp : 00000000 > > r10: 00000003 r9 : bffac954 r8 : bfefff68 > > r7 : bff01d88 r6 : 82000000 r5 : bff01d8c r4 : 00000003 > > r3 : 82000000 r2 : bff01d8c r1 : bff01d8c r0 : 00000002 > > Flags: nzCv IRQs off FIQs off Mode SVC_32 > > Resetting CPU ... > > > > resetting ... > > > > U-Boot SPL 2013.01.-rc1-g0f45941 (Dec 17 2013 - 14:23:41) > > OMAP4460 ES1.1 > > OMAP SD/MMC: 0 > > reading u-boot.img > > reading u-boot.bin > > reading u-boot.bin > > > > ...... > > > > Can anyone please help me why thumb mode build is failing? > > > > > > > > > _______________________________________________ > > linaro-toolchain mailing list > > linaro-toolchain@lists.linaro.org > > http://lists.linaro.org/mailman/listinfo/linaro-toolchain > > > > > > -- IMPORTANT NOTICE: The contents of this email and any attachments are > confidential and may also be privileged. If you are not the intended > recipient, please notify the sender immediately and do not disclose the > contents to any other person, use it for any purpose, or store or copy the > information in any medium. Thank you. > > ARM Limited, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, > Registered in England & Wales, Company No: 2557590 > ARM Holdings plc, Registered office 110 Fulbourn Road, Cambridge CB1 9NJ, > Registered in England & Wales, Company No: 2548782 >
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