Hi Michael, I'm not working on ARM, but on MIPS. Your problem is certainly different from mine.
Hi Daniel, I've tried out "gcc version 4.6.3 (Sourcery CodeBench Lite 2012.03-63)", and this version initialize gp register properly. Thanks, Justin ________________________________________ From: Michael Cashwell [[email protected]] Sent: Tuesday, February 26, 2013 11:44 AM To: Juhyun (Justin) Oh Cc: Daniel Schwierzeck; [email protected] Subject: Re: [U-Boot] [u-boot-mips] gp init and -pie option Not to hijack this thread, but I've had trouble with recent (2013.01 and perhaps the last 2012) mainline u-boots for Pandaboard when built using recent Codesourcery Lite tools. I've found that arm-2009q1 and arm-2010q1 work but arm-2012.03 and arm-2012.09 do not. SPL works but u-boot hangs very early. It's on my list of things to look into. -Michael Cashwell On Feb 26, 2013, at 1:12 PM, "Juhyun (Justin) Oh" <[email protected]> wrote: > HI Daniel, > > I'm using CodeSourcery 4.5.2. I've configured and have built the code for > "incaip" board and "dbau1000". The results are the same. (i.e. gp has been > set with wrong value) > > Could you tell me the CodeSourcery toolchain versions known to be working? > I'd like to try out the same version. > > Thanks, > Justin > > ________________________________________ > From: Daniel Schwierzeck [[email protected]] > Sent: Tuesday, February 26, 2013 1:52 AM > To: Juhyun (Justin) Oh > Cc: [email protected] > Subject: Re: [U-Boot] [u-boot-mips] gp init and -pie option > > 2013/2/25 Juhyun (Justin) Oh <[email protected]>: >> Hi, >> >> I got a problem while I was trying out v2013.01.01 on the u-boot-mips fork >> repo. It looks like my u-boot binary built with "-pie" linker option doesn't >> work due to wrong "gp" initialization. >> >> In the "start.S" file, the gp is supposed to be initialized with "_gp" >> because ra will hold the address of ".word _gp" line. The below is part of >> "start.S". >> >> ---------------------------- >> ... >> /* Initialize $gp */ >> bal 1f >> nop >> .word _gp >> 1: >> lw gp, 0(ra) >> ... >> ---------------------------- >> >> Without the -pie option, linker puts the start address of the .got section. >> However, with -pie option, the ".word _gp" is translated to "nop". The below >> is disassembled code. >> >> ---------------------------------------------------------------------------- >> 84001490 <reset>: >> ... >> 840014b8: 40804800 mtc0 zero,c0_count >> 840014bc: 40805800 mtc0 zero,c0_compare >> 840014c0: 04110002 bal 840014cc <reset+0x3c> >> 840014c4: 00000000 nop >> 840014c8: 00000000 nop <--------------- >> 840014cc: 8ffc0000 lw gp,0(ra) >> 840014d0: 3c1d8440 lui sp,0x8440 >> 840014d4: 8f9982c0 lw t9,-32064(gp) >> 840014d8: 03200008 jr t9 >> 840014dc: 00000000 nop >> ---------------------------------------------------------------------------- >> >> Could anyone tell me what is going on here? Am I missing anything? >> >> Thanks, >> Justin > > which board and toolchain do you use? > > PIE support has been tested with various toolchains from ELDK, > CodeSourcery and OpenWRT. > > -- > Best regards, > Daniel > _______________________________________________ > U-Boot mailing list > [email protected] > http://lists.denx.de/mailman/listinfo/u-boot _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
