diff options
Diffstat (limited to 'Documentation/blackfin')
| -rw-r--r-- | Documentation/blackfin/00-INDEX | 11 | ||||
| -rw-r--r-- | Documentation/blackfin/Filesystems | 169 | ||||
| -rw-r--r-- | Documentation/blackfin/cache-lock.txt | 48 | ||||
| -rw-r--r-- | Documentation/blackfin/cachefeatures.txt | 65 |
4 files changed, 293 insertions, 0 deletions
diff --git a/Documentation/blackfin/00-INDEX b/Documentation/blackfin/00-INDEX new file mode 100644 index 0000000..7cb3b35 --- /dev/null +++ b/Documentation/blackfin/00-INDEX @@ -0,0 +1,11 @@ +00-INDEX + - This file + +cache-lock.txt + - HOWTO for blackfin cache locking. + +cachefeatures.txt + - Supported cache features. + +Filesystems + - Requirements for mounting the root file system. diff --git a/Documentation/blackfin/Filesystems b/Documentation/blackfin/Filesystems new file mode 100644 index 0000000..51260a1 --- /dev/null +++ b/Documentation/blackfin/Filesystems @@ -0,0 +1,169 @@ +/* + * File: Documentation/blackfin/Filesystems + * Based on: + * Author: + * + * Created: + * Description: This file contains the simple DMA Implementation for Blackfin + * + * Rev: $Id: Filesystems 2384 2006-11-01 04:12:43Z magicyang $ + * + * Modified: + * Copyright 2004-2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + */ + + How to mount the root file system in uClinux/Blackfin + ----------------------------------------------------- + +1 Mounting EXT3 File system. + ------------------------ + + Creating an EXT3 File system for uClinux/Blackfin: + + +Please follow the steps to form the EXT3 File system and mount the same as root +file system. + +a Make an ext3 file system as large as you want the final root file + system. + + mkfs.ext3 /dev/ram0 <your-rootfs-size-in-1k-blocks> + +b Mount this Empty file system on a free directory as: + + mount -t ext3 /dev/ram0 ./test + where ./test is the empty directory. + +c Copy your root fs directory that you have so carefully made over. + + cp -af /tmp/my_final_rootfs_files/* ./test + + (For ex: cp -af uClinux-dist/romfs/* ./test) + +d If you have done everything right till now you should be able to see + the required "root" dir's (that's etc, root, bin, lib, sbin...) + +e Now unmount the file system + + umount ./test + +f Create the root file system image. + + dd if=/dev/ram0 bs=1k count=<your-rootfs-size-in-1k-blocks> \ + > ext3fs.img + + +Now you have to tell the kernel that will be mounting this file system as +rootfs. +So do a make menuconfig under kernel and select the Ext3 journaling file system +support under File system --> submenu. + + +2. Mounting EXT2 File system. + ------------------------- + +By default the ext2 file system image will be created if you invoke make from +the top uClinux-dist directory. + + +3. Mounting CRAMFS File System + ---------------------------- + +To create a CRAMFS file system image execute the command + + mkfs.cramfs ./test cramfs.img + + where ./test is the target directory. + + +4. Mounting ROMFS File System + -------------------------- + +To create a ROMFS file system image execute the command + + genromfs -v -V "ROMdisk" -f romfs.img -d ./test + + where ./test is the target directory + + +5. Mounting the JFFS2 Filesystem + ----------------------------- + +To create a compressed JFFS filesystem (JFFS2), please execute the command + + mkfs.jffs2 -d ./test -o jffs2.img + + where ./test is the target directory. + +However, please make sure the following is in your kernel config. + +/* + * RAM/ROM/Flash chip drivers + */ +#define CONFIG_MTD_CFI 1 +#define CONFIG_MTD_ROM 1 +/* + * Mapping drivers for chip access + */ +#define CONFIG_MTD_COMPLEX_MAPPINGS 1 +#define CONFIG_MTD_BF533 1 +#undef CONFIG_MTD_UCLINUX + +Through the u-boot boot loader, use the jffs2.img in the corresponding +partition made in linux-2.6.x/drivers/mtd/maps/bf533_flash.c. + +NOTE - Currently the Flash driver is available only for EZKIT. Watch out for a + STAMP driver soon. + + +6. Mounting the NFS File system + ----------------------------- + + For mounting the NFS please do the following in the kernel config. + + In Networking Support --> Networking options --> TCP/IP networking --> + IP: kernel level autoconfiguration + + Enable BOOTP Support. + + In Kernel hacking --> Compiled-in kernel boot parameter add the following + + root=/dev/nfs rw ip=bootp + + In File system --> Network File system, Enable + + NFS file system support --> NFSv3 client support + Root File system on NFS + + in uClibc menuconfig, do the following + In Networking Support + enable Remote Procedure Call (RPC) support + Full RPC Support + + On the Host side, ensure that /etc/dhcpd.conf looks something like this + + ddns-update-style ad-hoc; + allow bootp; + subnet 10.100.4.0 netmask 255.255.255.0 { + default-lease-time 122209600; + max-lease-time 31557600; + group { + host bf533 { + hardware ethernet 00:CF:52:49:C3:01; + fixed-address 10.100.4.50; + option root-path "/home/nfsmount"; + } + } + + ensure that /etc/exports looks something like this + /home/nfsmount *(rw,no_root_squash,no_all_squash) + + run the following commands as root (may differ depending on your + distribution) : + - service nfs start + - service portmap start + - service dhcpd start + - /usr/sbin/exportfs diff --git a/Documentation/blackfin/cache-lock.txt b/Documentation/blackfin/cache-lock.txt new file mode 100644 index 0000000..88ba1e6 --- /dev/null +++ b/Documentation/blackfin/cache-lock.txt @@ -0,0 +1,48 @@ +/* + * File: Documentation/blackfin/cache-lock.txt + * Based on: + * Author: + * + * Created: + * Description: This file contains the simple DMA Implementation for Blackfin + * + * Rev: $Id: cache-lock.txt 2384 2006-11-01 04:12:43Z magicyang $ + * + * Modified: + * Copyright 2004-2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + */ + +How to lock your code in cache in uClinux/blackfin +-------------------------------------------------- + +There are only a few steps required to lock your code into the cache. +Currently you can lock the code by Way. + +Below are the interface provided for locking the cache. + + +1. cache_grab_lock(int Ways); + +This function grab the lock for locking your code into the cache specified +by Ways. + + +2. cache_lock(int Ways); + +This function should be called after your critical code has been executed. +Once the critical code exits, the code is now loaded into the cache. This +function locks the code into the cache. + + +So, the example sequence will be: + + cache_grab_lock(WAY0_L); /* Grab the lock */ + + critical_code(); /* Execute the code of interest */ + + cache_lock(WAY0_L); /* Lock the cache */ + +Where WAY0_L signifies WAY0 locking. diff --git a/Documentation/blackfin/cachefeatures.txt b/Documentation/blackfin/cachefeatures.txt new file mode 100644 index 0000000..0fbec23 --- /dev/null +++ b/Documentation/blackfin/cachefeatures.txt @@ -0,0 +1,65 @@ +/* + * File: Documentation/blackfin/cachefeatures.txt + * Based on: + * Author: + * + * Created: + * Description: This file contains the simple DMA Implementation for Blackfin + * + * Rev: $Id: cachefeatures.txt 2384 2006-11-01 04:12:43Z magicyang $ + * + * Modified: + * Copyright 2004-2006 Analog Devices Inc. + * + * Bugs: Enter bugs at http://blackfin.uclinux.org/ + * + */ + + - Instruction and Data cache initialization. + icache_init(); + dcache_init(); + + - Instruction and Data cache Invalidation Routines, when flushing the + same is not required. + _icache_invalidate(); + _dcache_invalidate(); + + Also, for invalidating the entire instruction and data cache, the below + routines are provided (another method for invalidation, refer page no 267 and 287 of + ADSP-BF533 Hardware Reference manual) + + invalidate_entire_dcache(); + invalidate_entire_icache(); + + -External Flushing of Instruction and data cache routines. + + flush_instruction_cache(); + flush_data_cache(); + + - Internal Flushing of Instruction and Data Cache. + + icplb_flush(); + dcplb_flush(); + + - Locking the cache. + + cache_grab_lock(); + cache_lock(); + + Please refer linux-2.6.x/Documentation/blackfin/cache-lock.txt for how to + lock the cache. + + Locking the cache is optional feature. + + - Miscellaneous cache functions. + + flush_cache_all(); + flush_cache_mm(); + invalidate_dcache_range(); + flush_dcache_range(); + flush_dcache_page(); + flush_cache_range(); + flush_cache_page(); + invalidate_dcache_range(); + flush_page_to_ram(); + |
