| Message ID | 036701cd2e8e$cf4cc100$6de64300$%kim@samsung.com |
|---|---|
| State | New |
| Headers | show |
On 10-05-2012 10:25, Kukjin Kim wrote: > José Miguel Gonçalves wrote: >> While upgrading the kernel on a S3C2412 based board I've noted that it was >> impossible to boot the board with a 2.6.32 or upper kernel. >> I've tracked down the problem to the EBI virtual memory mapping that is in >> conflict with the IO mapping definition in arch/arm/mach-s3c24xx/s3c2412.c. >> >> Signed-off-by: José Miguel Gonçalves<jose.goncalves@inov.pt> >> --- >> arch/arm/plat-samsung/include/plat/map-s3c.h | 2 +- >> 1 files changed, 1 insertions(+), 1 deletions(-) >> >> diff --git a/arch/arm/plat-samsung/include/plat/map-s3c.h b/arch/arm/plat- >> samsung/include/plat/map-s3c.h >> index 7d04875..c0c70a8 100644 >> --- a/arch/arm/plat-samsung/include/plat/map-s3c.h >> +++ b/arch/arm/plat-samsung/include/plat/map-s3c.h >> @@ -22,7 +22,7 @@ >> #define S3C24XX_VA_WATCHDOG S3C_VA_WATCHDOG >> >> #define S3C2412_VA_SSMC S3C_ADDR_CPU(0x00000000) >> -#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00010000) >> +#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00100000) >> >> #define S3C2410_PA_UART (0x50000000) >> #define S3C24XX_PA_UART S3C2410_PA_UART >> -- >> 1.7.5.4 > Yeah, as you said, the mapping for SSMC invade EBI area but I think, just SZ_4K is enough for SSMC. So following is better in this case. How do you think? And there is no problem on your board? > > diff --git a/arch/arm/mach-s3c24xx/s3c2412.c b/arch/arm/mach-s3c24xx/s3c2412.c > index d4bc7f9..ac906bf 100644 > --- a/arch/arm/mach-s3c24xx/s3c2412.c > +++ b/arch/arm/mach-s3c24xx/s3c2412.c > @@ -72,7 +72,7 @@ static struct map_desc s3c2412_iodesc[] __initdata = { > { > .virtual = (unsigned long)S3C2412_VA_SSMC, > .pfn = __phys_to_pfn(S3C2412_PA_SSMC), > - .length = SZ_1M, > + .length = SZ_4K, > .type = MT_DEVICE, > }, > { > It does not work! I tried also a 64K length and also did not work. With your patch my console (with earlyprintk set) only displays the following: ## Booting image at 30800000 ... Image Name: Linux-3.2.16-inov1 Created: 2012-05-10 12:42:49 UTC Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1202592 Bytes = 1.1 MB Load Address: 30008000 Entry Point: 30008000 Verifying Checksum ... OK OK Starting kernel ... Uncompressing Linux... done, booting the kernel. Linux version 3.2.16-inov1 (jmpg@st-ze) (gcc version 4.6.4 20120402 (prerelease) (crosstool-NG 1.15.2) ) #3 PREEMPT Thu May 10 13:42:48 WEST 2012 CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177 CPU: VIVT data cache, VIVT instruction cache Machine: SMDK2412 bootconsole [earlycon0] enabled Memory policy: ECC disabled, Data cache writeback CPU S3C2412 (id 0x32412003) My guess is that the MMU initialization on the S3C2412 chip only allows a minimum of 1MB for the page size. Best regards, José Gonçalves
José Miguel Gonçalves wrote: > > On 10-05-2012 10:25, Kukjin Kim wrote: > > José Miguel Gonçalves wrote: > >> While upgrading the kernel on a S3C2412 based board I've noted that it > was > >> impossible to boot the board with a 2.6.32 or upper kernel. > >> I've tracked down the problem to the EBI virtual memory mapping that is > in > >> conflict with the IO mapping definition in arch/arm/mach- > s3c24xx/s3c2412.c. > >> > >> Signed-off-by: José Miguel Gonçalves<jose.goncalves@inov.pt> > >> --- > >> arch/arm/plat-samsung/include/plat/map-s3c.h | 2 +- > >> 1 files changed, 1 insertions(+), 1 deletions(-) > >> > >> diff --git a/arch/arm/plat-samsung/include/plat/map-s3c.h > b/arch/arm/plat- > >> samsung/include/plat/map-s3c.h > >> index 7d04875..c0c70a8 100644 > >> --- a/arch/arm/plat-samsung/include/plat/map-s3c.h > >> +++ b/arch/arm/plat-samsung/include/plat/map-s3c.h > >> @@ -22,7 +22,7 @@ > >> #define S3C24XX_VA_WATCHDOG S3C_VA_WATCHDOG > >> > >> #define S3C2412_VA_SSMC S3C_ADDR_CPU(0x00000000) > >> -#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00010000) > >> +#define S3C2412_VA_EBI S3C_ADDR_CPU(0x00100000) > >> > >> #define S3C2410_PA_UART (0x50000000) > >> #define S3C24XX_PA_UART S3C2410_PA_UART > >> -- > >> 1.7.5.4 > > Yeah, as you said, the mapping for SSMC invade EBI area but I think, > just SZ_4K is enough for SSMC. So following is better in this case. How do > you think? And there is no problem on your board? > > > > diff --git a/arch/arm/mach-s3c24xx/s3c2412.c b/arch/arm/mach- > s3c24xx/s3c2412.c > > index d4bc7f9..ac906bf 100644 > > --- a/arch/arm/mach-s3c24xx/s3c2412.c > > +++ b/arch/arm/mach-s3c24xx/s3c2412.c > > @@ -72,7 +72,7 @@ static struct map_desc s3c2412_iodesc[] __initdata = { > > { > > .virtual = (unsigned long)S3C2412_VA_SSMC, > > .pfn = __phys_to_pfn(S3C2412_PA_SSMC), > > - .length = SZ_1M, > > + .length = SZ_4K, > > .type = MT_DEVICE, > > }, > > { > > > > It does not work! I tried also a 64K length and also did not work. With > your patch > my console (with earlyprintk set) only displays the following: > > ## Booting image at 30800000 ... > Image Name: Linux-3.2.16-inov1 > Created: 2012-05-10 12:42:49 UTC > Image Type: ARM Linux Kernel Image (uncompressed) > Data Size: 1202592 Bytes = 1.1 MB > Load Address: 30008000 > Entry Point: 30008000 > Verifying Checksum ... OK > OK > > Starting kernel ... > > Uncompressing Linux... done, booting the kernel. > Linux version 3.2.16-inov1 (jmpg@st-ze) (gcc version 4.6.4 20120402 > (prerelease) > (crosstool-NG 1.15.2) ) #3 PREEMPT Thu May 10 13:42:48 WEST 2012 > CPU: ARM926EJ-S [41069265] revision 5 (ARMv5TEJ), cr=00053177 > CPU: VIVT data cache, VIVT instruction cache > Machine: SMDK2412 > bootconsole [earlycon0] enabled > Memory policy: ECC disabled, Data cache writeback > CPU S3C2412 (id 0x32412003) > > My guess is that the MMU initialization on the S3C2412 chip only allows a > minimum > of 1MB for the page size. > Hmm, could be... there is no smdk2412 on my desk :( OK, will apply your fix. Thanks. Best regards, Kgene. -- Kukjin Kim <kgene.kim@samsung.com>, Senior Engineer, SW Solution Development Team, Samsung Electronics Co., Ltd.
diff --git a/arch/arm/mach-s3c24xx/s3c2412.c b/arch/arm/mach-s3c24xx/s3c2412.c index d4bc7f9..ac906bf 100644 --- a/arch/arm/mach-s3c24xx/s3c2412.c +++ b/arch/arm/mach-s3c24xx/s3c2412.c @@ -72,7 +72,7 @@ static struct map_desc s3c2412_iodesc[] __initdata = { { .virtual = (unsigned long)S3C2412_VA_SSMC, .pfn = __phys_to_pfn(S3C2412_PA_SSMC), - .length = SZ_1M, + .length = SZ_4K, .type = MT_DEVICE, }, {