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Diffstat (limited to 'kernel/Documentation/arm/SA1100/Assabet')
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diff --git a/kernel/Documentation/arm/SA1100/Assabet b/kernel/Documentation/arm/SA1100/Assabet new file mode 100644 index 000000000..08b885d35 --- /dev/null +++ b/kernel/Documentation/arm/SA1100/Assabet @@ -0,0 +1,300 @@ +The Intel Assabet (SA-1110 evaluation) board +============================================ + +Please see: +http://developer.intel.com + +Also some notes from John G Dorsey <jd5q@andrew.cmu.edu>: +http://www.cs.cmu.edu/~wearable/software/assabet.html + + +Building the kernel +------------------- + +To build the kernel with current defaults: + + make assabet_config + make oldconfig + make zImage + +The resulting kernel image should be available in linux/arch/arm/boot/zImage. + + +Installing a bootloader +----------------------- + +A couple of bootloaders able to boot Linux on Assabet are available: + +BLOB (http://www.lartmaker.nl/lartware/blob/) + + BLOB is a bootloader used within the LART project. Some contributed + patches were merged into BLOB to add support for Assabet. + +Compaq's Bootldr + John Dorsey's patch for Assabet support +(http://www.handhelds.org/Compaq/bootldr.html) +(http://www.wearablegroup.org/software/bootldr/) + + Bootldr is the bootloader developed by Compaq for the iPAQ Pocket PC. + John Dorsey has produced add-on patches to add support for Assabet and + the JFFS filesystem. + +RedBoot (http://sources.redhat.com/redboot/) + + RedBoot is a bootloader developed by Red Hat based on the eCos RTOS + hardware abstraction layer. It supports Assabet amongst many other + hardware platforms. + +RedBoot is currently the recommended choice since it's the only one to have +networking support, and is the most actively maintained. + +Brief examples on how to boot Linux with RedBoot are shown below. But first +you need to have RedBoot installed in your flash memory. A known to work +precompiled RedBoot binary is available from the following location: + +ftp://ftp.netwinder.org/users/n/nico/ +ftp://ftp.arm.linux.org.uk/pub/linux/arm/people/nico/ +ftp://ftp.handhelds.org/pub/linux/arm/sa-1100-patches/ + +Look for redboot-assabet*.tgz. Some installation infos are provided in +redboot-assabet*.txt. + + +Initial RedBoot configuration +----------------------------- + +The commands used here are explained in The RedBoot User's Guide available +on-line at http://sources.redhat.com/ecos/docs.html. +Please refer to it for explanations. + +If you have a CF network card (my Assabet kit contained a CF+ LP-E from +Socket Communications Inc.), you should strongly consider using it for TFTP +file transfers. You must insert it before RedBoot runs since it can't detect +it dynamically. + +To initialize the flash directory: + + fis init -f + +To initialize the non-volatile settings, like whether you want to use BOOTP or +a static IP address, etc, use this command: + + fconfig -i + + +Writing a kernel image into flash +--------------------------------- + +First, the kernel image must be loaded into RAM. If you have the zImage file +available on a TFTP server: + + load zImage -r -b 0x100000 + +If you rather want to use Y-Modem upload over the serial port: + + load -m ymodem -r -b 0x100000 + +To write it to flash: + + fis create "Linux kernel" -b 0x100000 -l 0xc0000 + + +Booting the kernel +------------------ + +The kernel still requires a filesystem to boot. A ramdisk image can be loaded +as follows: + + load ramdisk_image.gz -r -b 0x800000 + +Again, Y-Modem upload can be used instead of TFTP by replacing the file name +by '-y ymodem'. + +Now the kernel can be retrieved from flash like this: + + fis load "Linux kernel" + +or loaded as described previously. To boot the kernel: + + exec -b 0x100000 -l 0xc0000 + +The ramdisk image could be stored into flash as well, but there are better +solutions for on-flash filesystems as mentioned below. + + +Using JFFS2 +----------- + +Using JFFS2 (the Second Journalling Flash File System) is probably the most +convenient way to store a writable filesystem into flash. JFFS2 is used in +conjunction with the MTD layer which is responsible for low-level flash +management. More information on the Linux MTD can be found on-line at: +http://www.linux-mtd.infradead.org/. A JFFS howto with some infos about +creating JFFS/JFFS2 images is available from the same site. + +For instance, a sample JFFS2 image can be retrieved from the same FTP sites +mentioned below for the precompiled RedBoot image. + +To load this file: + + load sample_img.jffs2 -r -b 0x100000 + +The result should look like: + +RedBoot> load sample_img.jffs2 -r -b 0x100000 +Raw file loaded 0x00100000-0x00377424 + +Now we must know the size of the unallocated flash: + + fis free + +Result: + +RedBoot> fis free + 0x500E0000 .. 0x503C0000 + +The values above may be different depending on the size of the filesystem and +the type of flash. See their usage below as an example and take care of +substituting yours appropriately. + +We must determine some values: + +size of unallocated flash: 0x503c0000 - 0x500e0000 = 0x2e0000 +size of the filesystem image: 0x00377424 - 0x00100000 = 0x277424 + +We want to fit the filesystem image of course, but we also want to give it all +the remaining flash space as well. To write it: + + fis unlock -f 0x500E0000 -l 0x2e0000 + fis erase -f 0x500E0000 -l 0x2e0000 + fis write -b 0x100000 -l 0x277424 -f 0x500E0000 + fis create "JFFS2" -n -f 0x500E0000 -l 0x2e0000 + +Now the filesystem is associated to a MTD "partition" once Linux has discovered +what they are in the boot process. From Redboot, the 'fis list' command +displays them: + +RedBoot> fis list +Name FLASH addr Mem addr Length Entry point +RedBoot 0x50000000 0x50000000 0x00020000 0x00000000 +RedBoot config 0x503C0000 0x503C0000 0x00020000 0x00000000 +FIS directory 0x503E0000 0x503E0000 0x00020000 0x00000000 +Linux kernel 0x50020000 0x00100000 0x000C0000 0x00000000 +JFFS2 0x500E0000 0x500E0000 0x002E0000 0x00000000 + +However Linux should display something like: + +SA1100 flash: probing 32-bit flash bus +SA1100 flash: Found 2 x16 devices at 0x0 in 32-bit mode +Using RedBoot partition definition +Creating 5 MTD partitions on "SA1100 flash": +0x00000000-0x00020000 : "RedBoot" +0x00020000-0x000e0000 : "Linux kernel" +0x000e0000-0x003c0000 : "JFFS2" +0x003c0000-0x003e0000 : "RedBoot config" +0x003e0000-0x00400000 : "FIS directory" + +What's important here is the position of the partition we are interested in, +which is the third one. Within Linux, this correspond to /dev/mtdblock2. +Therefore to boot Linux with the kernel and its root filesystem in flash, we +need this RedBoot command: + + fis load "Linux kernel" + exec -b 0x100000 -l 0xc0000 -c "root=/dev/mtdblock2" + +Of course other filesystems than JFFS might be used, like cramfs for example. +You might want to boot with a root filesystem over NFS, etc. It is also +possible, and sometimes more convenient, to flash a filesystem directly from +within Linux while booted from a ramdisk or NFS. The Linux MTD repository has +many tools to deal with flash memory as well, to erase it for example. JFFS2 +can then be mounted directly on a freshly erased partition and files can be +copied over directly. Etc... + + +RedBoot scripting +----------------- + +All the commands above aren't so useful if they have to be typed in every +time the Assabet is rebooted. Therefore it's possible to automatize the boot +process using RedBoot's scripting capability. + +For example, I use this to boot Linux with both the kernel and the ramdisk +images retrieved from a TFTP server on the network: + +RedBoot> fconfig +Run script at boot: false true +Boot script: +Enter script, terminate with empty line +>> load zImage -r -b 0x100000 +>> load ramdisk_ks.gz -r -b 0x800000 +>> exec -b 0x100000 -l 0xc0000 +>> +Boot script timeout (1000ms resolution): 3 +Use BOOTP for network configuration: true +GDB connection port: 9000 +Network debug at boot time: false +Update RedBoot non-volatile configuration - are you sure (y/n)? y + +Then, rebooting the Assabet is just a matter of waiting for the login prompt. + + + +Nicolas Pitre +nico@fluxnic.net +June 12, 2001 + + +Status of peripherals in -rmk tree (updated 14/10/2001) +------------------------------------------------------- + +Assabet: + Serial ports: + Radio: TX, RX, CTS, DSR, DCD, RI + PM: Not tested. + COM: TX, RX, CTS, DSR, DCD, RTS, DTR, PM + PM: Not tested. + I2C: Implemented, not fully tested. + L3: Fully tested, pass. + PM: Not tested. + + Video: + LCD: Fully tested. PM + (LCD doesn't like being blanked with + neponset connected) + Video out: Not fully + + Audio: + UDA1341: + Playback: Fully tested, pass. + Record: Implemented, not tested. + PM: Not tested. + + UCB1200: + Audio play: Implemented, not heavily tested. + Audio rec: Implemented, not heavily tested. + Telco audio play: Implemented, not heavily tested. + Telco audio rec: Implemented, not heavily tested. + POTS control: No + Touchscreen: Yes + PM: Not tested. + + Other: + PCMCIA: + LPE: Fully tested, pass. + USB: No + IRDA: + SIR: Fully tested, pass. + FIR: Fully tested, pass. + PM: Not tested. + +Neponset: + Serial ports: + COM1,2: TX, RX, CTS, DSR, DCD, RTS, DTR + PM: Not tested. + USB: Implemented, not heavily tested. + PCMCIA: Implemented, not heavily tested. + PM: Not tested. + CF: Implemented, not heavily tested. + PM: Not tested. + +More stuff can be found in the -np (Nicolas Pitre's) tree. + |