Re: [U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger
Scott Wood wrote on 2012/04/25 20:59:22: > > On 04/25/2012 01:55 PM, Joakim Tjernlund wrote: > > > > Scott Wood wrote on 2012/04/25 20:43:22: > >> > >> On 04/25/2012 05:57 AM, Joakim Tjernlund wrote: > > Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set > always. > Where MSR = Machine State register > > Make sure of MSR[DE] bit is set uniformaly across the different execution > address space i.e. AS0 and AS1. > >>> > >>> Hi > >>> > >>> We are trying to bring up our custom P2010 RDB based board. boot is NOR > >>> based and we cannot get past the rfi below. > >>>lis r6,MSR_IS|MSR_DS@h > >>>ori r6,r6,MSR_IS|MSR_DS@l > >>>lis r7,switch_as@h > >>>ori r7,r7,switch_as@l > >>> > >>>mtspr SPRN_SRR0,r7 > >>>mtspr SPRN_SRR1,r6 > >>>rfi > >>> > >>> switch_as: > >>> > >>> We end up with a TLB exception no matter what we do, even after applying > >>> this patch. > >> > >> Did you apply the entire patchset, and define > >> CONFIG_SYS_PPC_E500_DEBUG_TLB? > > > > No, but this code is executed before any of the other parts of the patch. > > Anyhow, I just > > found the problem(really obvious once I found it). > > During bring up we had to load uboot in the middle of the flash instead of > > the end because we have a flash burn problem in the end of the flash that > > we do not > > understand yet. We think it may be related to DDR3 being misconfigured by > > the emulator(BDI3000). > > I do not understand why this emulator can not use the L2SRAM instead? Is > > there something > > magic behind the L2SRAM so it is impossible to use it as a work area for > > flash burning? > > I don't know of any reason L2SRAM couldn't be used for this. My guess > is they just don't want to have to support more than one way of creating > RAM. Right, we will look into this some more then. Back to our rfi problem. I think there is an bug in u-boot start.S. This part is what you land in for NOR based boot: #if !defined(CONFIG_SYS_RAMBOOT) && !defined(CONFIG_SECURE_BOOT) /* create a temp mapping in AS=1 to the 4M boot window */ lis r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@h ori r7,r7,FSL_BOOKE_MAS1(1, 1, 0, 1, BOOKE_PAGESZ_4M)@l lis r8,FSL_BOOKE_MAS2(CONFIG_SYS_MONITOR_BASE & 0xffc0, (MAS2_I|MAS2_G))@h ori r8,r8,FSL_BOOKE_MAS2(CONFIG_SYS_MONITOR_BASE & 0xffc0, (MAS2_I|MAS2_G))@l /* The 85xx has the default boot window 0xff80 - 0x */ lis r9,FSL_BOOKE_MAS3(0xffc0, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@h ori r9,r9,FSL_BOOKE_MAS3(0xffc0, 0, (MAS3_SX|MAS3_SW|MAS3_SR))@l Here r9 is fixed to 0xffc0, this will only work for CONFIG_SYS_MONITOR_BASE >= 0xffc0 (we had a lower value) I don't know how this should be changed so it works for all boards, we just copied the values from the r8 settings to move on. Jocke ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger
On 04/25/2012 01:55 PM, Joakim Tjernlund wrote: > > Scott Wood wrote on 2012/04/25 20:43:22: >> >> On 04/25/2012 05:57 AM, Joakim Tjernlund wrote: Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set always. Where MSR = Machine State register Make sure of MSR[DE] bit is set uniformaly across the different execution address space i.e. AS0 and AS1. >>> >>> Hi >>> >>> We are trying to bring up our custom P2010 RDB based board. boot is NOR >>> based and we cannot get past the rfi below. >>>lis r6,MSR_IS|MSR_DS@h >>>ori r6,r6,MSR_IS|MSR_DS@l >>>lis r7,switch_as@h >>>ori r7,r7,switch_as@l >>> >>>mtspr SPRN_SRR0,r7 >>>mtspr SPRN_SRR1,r6 >>>rfi >>> >>> switch_as: >>> >>> We end up with a TLB exception no matter what we do, even after applying >>> this patch. >> >> Did you apply the entire patchset, and define CONFIG_SYS_PPC_E500_DEBUG_TLB? > > No, but this code is executed before any of the other parts of the patch. > Anyhow, I just > found the problem(really obvious once I found it). > During bring up we had to load uboot in the middle of the flash instead of > the end because we have a flash burn problem in the end of the flash that we > do not > understand yet. We think it may be related to DDR3 being misconfigured by the > emulator(BDI3000). > I do not understand why this emulator can not use the L2SRAM instead? Is > there something > magic behind the L2SRAM so it is impossible to use it as a work area for > flash burning? I don't know of any reason L2SRAM couldn't be used for this. My guess is they just don't want to have to support more than one way of creating RAM. -Scott ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger
Scott Wood wrote on 2012/04/25 20:43:22: > > On 04/25/2012 05:57 AM, Joakim Tjernlund wrote: > >> > >> Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set > >> always. > >> Where MSR = Machine State register > >> > >> Make sure of MSR[DE] bit is set uniformaly across the different execution > >> address space i.e. AS0 and AS1. > > > > Hi > > > > We are trying to bring up our custom P2010 RDB based board. boot is NOR > > based and we cannot get past the rfi below. > >lis r6,MSR_IS|MSR_DS@h > >ori r6,r6,MSR_IS|MSR_DS@l > >lis r7,switch_as@h > >ori r7,r7,switch_as@l > > > >mtspr SPRN_SRR0,r7 > >mtspr SPRN_SRR1,r6 > >rfi > > > > switch_as: > > > > We end up with a TLB exception no matter what we do, even after applying > > this patch. > > Did you apply the entire patchset, and define CONFIG_SYS_PPC_E500_DEBUG_TLB? No, but this code is executed before any of the other parts of the patch. Anyhow, I just found the problem(really obvious once I found it). During bring up we had to load uboot in the middle of the flash instead of the end because we have a flash burn problem in the end of the flash that we do not understand yet. We think it may be related to DDR3 being misconfigured by the emulator(BDI3000). I do not understand why this emulator can not use the L2SRAM instead? Is there something magic behind the L2SRAM so it is impossible to use it as a work area for flash burning? Jocke ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger
On 04/25/2012 05:57 AM, Joakim Tjernlund wrote: >> >> Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set always. >> Where MSR = Machine State register >> >> Make sure of MSR[DE] bit is set uniformaly across the different execution >> address space i.e. AS0 and AS1. > > Hi > > We are trying to bring up our custom P2010 RDB based board. boot is NOR > based and we cannot get past the rfi below. > lis r6,MSR_IS|MSR_DS@h > ori r6,r6,MSR_IS|MSR_DS@l > lis r7,switch_as@h > ori r7,r7,switch_as@l > > mtspr SPRN_SRR0,r7 > mtspr SPRN_SRR1,r6 > rfi > > switch_as: > > We end up with a TLB exception no matter what we do, even after applying this > patch. Did you apply the entire patchset, and define CONFIG_SYS_PPC_E500_DEBUG_TLB? -Scott ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
Re: [U-Boot] [PATCH 2/4][v2] powerpc/85xx:Fix MSR[DE] bit in MSR to support debugger
> > Debugging of e500 and e500v1 processer requires MSR[DE] bit to be set always. > Where MSR = Machine State register > > Make sure of MSR[DE] bit is set uniformaly across the different execution > address space i.e. AS0 and AS1. Hi We are trying to bring up our custom P2010 RDB based board. boot is NOR based and we cannot get past the rfi below. lis r6,MSR_IS|MSR_DS@h ori r6,r6,MSR_IS|MSR_DS@l lis r7,switch_as@h ori r7,r7,switch_as@l mtspr SPRN_SRR0,r7 mtspr SPRN_SRR1,r6 rfi switch_as: We end up with a TLB exception no matter what we do, even after applying this patch. Using a Abatron BDI3000 emluator Any pointers as what to look for would be greatly appreciated. Have anyone on the list managed to get past this rfi instruction using BDI3000? What emulator config did you use? Jocke > > Signed-off-by: Radu Lazarescu > Signed-off-by: Catalin Udma > Signed-off-by: Marius Grigoras > Signed-off-by: Prabhakar Kushwaha > --- > Based upon git://git.denx.de/u-boot.git branch master > > Changes for v2: >- Avoid MSR_DE negation in arch_preboot >- Made MSR_DE set code independent of any #define > > No change, Resending again > > Tested on > - SoC having E500 Family processor (P1010RDB, BSC9131RDB) > - SoC having E500MC Family processor (P4080DS, P3041DS) > > arch/powerpc/cpu/mpc85xx/cpu_init.c |2 +- > arch/powerpc/cpu/mpc85xx/start.S|7 +-- > 2 files changed, 6 insertions(+), 3 deletions(-) > > diff --git a/arch/powerpc/cpu/mpc85xx/cpu_init.c > b/arch/powerpc/cpu/mpc85xx/cpu_init.c > index 2e4a06c..3bcbffa 100644 > --- a/arch/powerpc/cpu/mpc85xx/cpu_init.c > +++ b/arch/powerpc/cpu/mpc85xx/cpu_init.c > @@ -532,7 +532,7 @@ void arch_preboot_os(void) > * disabled by the time we get called. > */ > msr = mfmsr(); > - msr &= ~(MSR_ME|MSR_CE|MSR_DE); > + msr &= ~(MSR_ME|MSR_CE); > mtmsr(msr); > > setup_ivors(); > diff --git a/arch/powerpc/cpu/mpc85xx/start.S > b/arch/powerpc/cpu/mpc85xx/start.S > index 7bfa2d5..597151b 100644 > --- a/arch/powerpc/cpu/mpc85xx/start.S > +++ b/arch/powerpc/cpu/mpc85xx/start.S > @@ -82,6 +82,9 @@ > .globl _start_e500 > > _start_e500: > +/* Enable debug exception */ > + li r1,MSR_DE > + mtmsrr1 > > #if defined(CONFIG_SECURE_BOOT) && defined(CONFIG_E500MC) > /* ISBC uses L2 as stack. > @@ -729,8 +732,8 @@ 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 > lis r7,switch_as@h > ori r7,r7,switch_as@l > > -- > 1.7.5.4 > > > > ___ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot ___ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
