Dear Prabhakar Kushwaha, In message <1329296042-28506-1-git-send-email-prabha...@freescale.com> you wrote: > Debugger's ability to debug an application is constrained by the > architecture's debug IP / run-control solution that may impose certain > requirements for the application itself. > Similarly, when referring to the e500 and e500v2 architecture, there are two > basic rules any application has to respect in order to allow full debugging > support: > 1. Keep MSR[DE] bit set > 2. Have a valid opcode that can be fetched from the debug exception > vector [IVPR|IVOR15]. > Here MSR = Machine State register > > This patch makes sure of point "1" and make MSR[DE] bit is set uniformaly > across the different execution in address space.
Does it make sense to repeast the whole README here? > diff --git a/arch/powerpc/cpu/mpc85xx/start.S > b/arch/powerpc/cpu/mpc85xx/start.S > index 7bfa2d5..09111e6 100644 > --- a/arch/powerpc/cpu/mpc85xx/start.S > +++ b/arch/powerpc/cpu/mpc85xx/start.S > @@ -82,6 +82,11 @@ > .globl _start_e500 > > _start_e500: > +#if defined(CONFIG_E500_V1_V2) > +/* Enable debug exception */ > + li r1,MSR_DE > + mtmsr r1 > +#endif Why is this #ifdef needed here? > #if defined(CONFIG_SECURE_BOOT) && defined(CONFIG_E500MC) > /* ISBC uses L2 as stack. > @@ -729,8 +734,8 @@ create_init_ram_area: > msync > tlbwe > > - lis r6,MSR_IS|MSR_DS@h > - ori r6,r6,MSR_IS|MSR_DS@l > + lis r6,MSR_IS|MSR_DS|MSR_DE@h > + ori r6,r6,MSR_IS|MSR_DS|MSR_DE@l And why don;t we need such an #ifdef here? Also, CONFIG_E500_V1_V2 is undocumented. Best regards, Wolfgang Denk -- DENX Software Engineering GmbH, MD: Wolfgang Denk & Detlev Zundel HRB 165235 Munich, Office: Kirchenstr.5, D-82194 Groebenzell, Germany Phone: (+49)-8142-66989-10 Fax: (+49)-8142-66989-80 Email: w...@denx.de "(The Chief Programmer) personally defines the functional and performance specifications, designs the program, codes it, tests it, and writes its documentation... He needs great talent, ten years experience and considerable systems and applications knowledge, whether in applied mathematics, business data handling, or whatever." - Fred P. Brooks, _The Mythical Man Month_ _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot