Hi Greg, Thank you very much for your valuable information and suggestions. On Mon, Mar 21, 2011 at 4:57 PM, Greg Ungerer <gerg@xxxxxxxxxxxx> wrote: > > Hi Madhavi, > > On 19/03/11 01:54, Madhavi Manchala wrote: >> >> I have one basic question about the architecture files in Linux >> kernels. We have a board with Samsung S3C2510A MCU (ARM940T core) >> which is a no-mmu based CPU. I heard that "there was not a lot of ARM >> no-mmu support at the moment" from Ben Dooks. > > The core is there, but there is very little specific machine support. > The one I use for testing is non-MMU ARM is the Atmel/AT91X40 (that is > CONFIG_ARCH_AT91X40). I don't run it on real hardware, but on the > SkyEye emulator. I saw the mach-at91/at91x40.c and mach-at91/at91x40_time.c file sources. There is a few lines of code is available in these two files. I guess, some of the common files are there for all Atmel boards and that is also included as a part of at91x40 board. Am I correct? I found only at91_aic_init() function only called from at91x40.c file. What about other initialization like serial etc.? Is this included from common files for Atmel boards? > >> So, I started developing the architecture files for my Samsung >> S3C2510A MCU (ARM940T core) by looking at the existing S3C2410A >> (ARM920 core) architecture files. Is this my porting (developing the >> architecture files) correct? > > Would make sense to start on something similar, yes. I downloaded the latest uClinux sources from http://sourceforge.net/projects/uclinux/files/uClinux%20Stable/ and the name of the file is uClinux-dist-20101026.tar.bz2. In this distribution, I found mach-s3c24a0, mach-s3c3410, s3c44b0x and mach-s5c7375 sources in linux-2.6.x/arch/arm/ directory. (Arnd asked me to see these sources as a reference, only). So, I am looking at these sources and especially s3c3410 sources as remaining are different like s3c24a0 is a MMU based etc. > >> How can I port the Linux on to my board which has a Samsung S3C2510A >> MCU (ARM940T core) which is a NO-MMU based CPU? >> >> Thanks for your suggestions / hints / comments. > > You can look at what I did with the AT91X40 for an example. > Or look at the patches that Ithamar Adema sent to the ARM linux > mailing list in the last few days for supporting the NXP LPC2K > family as another example (they are also non-MMU parts). As I said above, there are only two files which are related to at91x40 board. However, I found some sources for the Ithamar Adema patches at the following link. http://www.spinics.net/lists/arm-kernel/msg118932.html These sources (patches) are similar to samsung sources which are available in uClinux-dist. So, I will look into the Ithamar Adema patches and uClinux-dist samsung machine directory sources. Please suggest me. My final question, All these samsung machines (s3c24a0, s3c3410, s3c44b0x and s5c7375) are ARM7TDMI core based MCUs. My MCU (Samsung s3c2510A) is a ARM9TDMI core based. So, is this porting will help? I am extreamly sorry, If I asked silly questions here. Once again, thanks for your suggestions and valuable inforamtion. Thanks and Regards, Madhavi. M > Regards > Greg > > > ------------------------------------------------------------------------ > Greg Ungerer -- Principal Engineer EMAIL: gerg@xxxxxxxxxxxx > SnapGear Group, McAfee PHONE: +61 7 3435 2888 > 8 Gardner Close FAX: +61 7 3217 5323 > Milton, QLD, 4064, Australia WEB: http://www.SnapGear.com > -- To unsubscribe from this list: send the line "unsubscribe linux-arch" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
