Andrew,
In platform.S, in the section where it says AEMIF configuration for NOR flash,
add the following after the WAITCFG configuration:
.
.
.
/*------------------------------------------------------*
* AEMIF configuration for NOR Flash (double check) *
*------------------------------------------------------*/
LDR R0, _PINMUX0
LDR R1, _DEV_SETTING
STR R1, [R0]
LDR R0, WAITCFG
LDR R1, WAITCFG_VAL
LDR R2, [R0]
ORR R2, R2, R1
STR R2, [R0]
// add this to configure CS2
LDR R0, ACFG2
LDR R1, ACFG2_VAL
STR R1, [R0]
.
.
.
Then at the bottom, change ACFG2_VAL from 0x3FFFFFFD to 0x0030650D:
ACFG2_VAL: .word 0x0030650D
Regards,
Andy
----- Original Message ----
From: Andrew Armstrong <[EMAIL PROTECTED]>
To: Andy Ngo <[EMAIL PROTECTED]>
Cc: [email protected]
Sent: Wednesday, April 11, 2007 3:54:20 AM
Subject: Re: NOR flash file system on Davinci
Andy,
I would quite like to try this mod, where do you set the code from? I
thought platform.S was for assembler?
Regards,
Andrew
On Wed, 2007-04-11 at 00:55 -0700, Andy Ngo wrote:
> Note also that the default NOR flash memory controller setting in the
> current
> DVEVM configuration (u-boot) is NOT optimal (everything is set at max
> timeout, wait states, etc). Hence the performance on the JFFS2
> filesystem is
> not efficient and is relatively slow. I changed the value to
> asynchronous
> configuration register (NOR flash is attached to CS2) as follows:
>
> ACFG2 = 0
> | ( 0 << 31 ) // selectStrobe = 0;
> | ( 0 << 30 ) // extWait = 0;
> | ( 0 << 26 ) // writeSetup = 0; // 0 ns
> | ( 3 << 20 ) // writeStrobe = 3; // 35 ns
> | ( 0 << 17 ) // writeHold = 0; // 0 ns
> | ( 3 << 13 ) // readSetup = 3; // 30 ns
> | ( 10<< 7 ) // readStrobe = 10; // 120 ns
> | ( 0 << 4 ) // readHold = 0; // 0 ns
> | ( 3 << 2 ) // turnAround = 3; // ?? ns ( MAX
> TIMEOUT )
> | ( 1 << 0 ) // asyncSize = 1; // 16-bit bus
> ;
>
> and it gives me a lot better performance. You can add code to set the
> CS2 ACR
> register in board/davinci/platform.S (in the same area where CS3, CS4,
> and CS5
> are initialized).
>
> Regards,
> Andy
>
> ----- Original Message ----
> From: Andy Ngo <[EMAIL PROTECTED]>
> To: Yogesh Kumar M <[EMAIL PROTECTED]>;
> [email protected]
> Sent: Tuesday, April 10, 2007 11:25:52 PM
> Subject: Re: NOR flash file system on Davinci
>
> Yogesh,
>
> I have done so. Took me a while to figure it out but I eventually did
> it.
> Here is a summary of the steps for those who want to try:
>
> 1) Download the GIT kernel (linux-davinci-2.6); the Montavista version
> doesn't
> seem to support it
> 2) Create a default config for the DVEVM
> make ARCH=arm CROSS_COMPILE=arm_v5t_le-
> davinci_evm_dm644x_defconfig
> 3) Configure the kernel to disable IDE (MTD NOR flash can only be used
> when IDE support
> is disabled)
>
> make ARCH=arm CROSS_COMPILE=arm_v5t_le- menuconfig
> => Device Drivers => ATA/ATAPI/MFM/RLL support => unselect
> ATA/ATAPI/MFM/RLL support
>
> * NOTE: no need to enable MTD NOR JFFS2 support since it's already
> enabled in
> the default DVEVM configuration from step 2
>
> The flash layout is already defined in
> arch/arm/mach-davinci/board-evm.c:
>
> static struct mtd_partition davinci_evm_partitions[] = {
> /* bootloader (U-Boot, etc) in first 4 sectors */
> {
> .name = "bootloader",
> .offset = 0,
> .size = 4 * SZ_64K,
> .mask_flags = MTD_WRITEABLE, /* force read-only */
> },
> /* bootloader params in the next 1 sectors */
> {
> .name = "params",
> .offset = MTDPART_OFS_APPEND,
> .size = SZ_64K,
> .mask_flags = 0,
> },
> /* kernel */
> {
> .name = "kernel",
> .offset = MTDPART_OFS_APPEND,
> .size = SZ_2M,
> .mask_flags = 0
> },
> /* file system */
> {
> .name = "filesystem",
> .offset = MTDPART_OFS_APPEND,
> .size = MTDPART_SIZ_FULL,
> .mask_flags = 0
> }
> };
>
> so the 4 MTD partitions should look like this:
>
> 0x00000000-0x00040000 : "bootloader"
> 0x00040000-0x00050000 : "params"
> 0x00050000-0x00250000 : "kernel"
> 0x00250000-0x01000000 : "filesystem"
>
> Your JFFS2 filesystem will reside in the 4th MTD partition.
>
> 4) Build the kernel
> 5) Prepare your JFFS2 filesystem
> a) Download the mtd utilities from
> http://www.linux-mtd.infradead.org/
> and build it to generate the mkfs.jffs2 utility
> b) Gather the rootfs with which you want to generate the
> filesystem;
> I used the sample ramdisk.gz mentioned from spraah2.pdf:
> gunzip ramdisk.gz
> mkdir myrootfs
> mount -o loop ramdisk myrootfs
> c) Create the JFFS2 filesystem
> mkfs.jffs2 -d myrootfs -o rootfs.jffs2 -e 0x10000
> 6) Use u-boot to flash the uImage (from 4) and rootfs.jffs2 (from 5c)
> a) Flash uImage at 0x02050000
> b) Flash rootfs.jffs2 at 0x02250000
> 7) Adjust your boot environment variables to boot to the new NOR JFFS2
> filesystem
> a) setenv bootargs mem=120M console=ttyS0,115200n8
> root=/dev/mtdblock3 rw noinitrd noatime rootfstype=jffs2 ip=off
> b) saveenv
> 8) You are done! Reboot your board and you will boot to your new JFFS2
> filesystem
> on the NOR flash. NOTE: the first time you boot, the JFFS2
> processing will
> prepare (format) the filesystem for use so you will hang at the
> kernel message
> "Freeing init memory: 80K" for a few minutes so be patient. The
> next time you
> boot you won't get this "hung delay" as your JFFS2 filesystem is
> already formatted.
>
> I spent over a week figuring this out (wasting most of my time on the
> Montavista
> kernel until I switched over to the GIT kernel) I hope this helps
> anyone who wants
> to create a small footprint system, which doesn't have the luxury of a
> hard drive
> as the DVEVM board does.
>
> Regards,
> Andy
>
>
>
>
> ----- Original Message ----
> From: Yogesh Kumar M <[EMAIL PROTECTED]>
> To: [email protected]
> Sent: Monday, April 9, 2007 1:34:54 AM
> Subject: NOR flash file system on Davinci
>
> Hi,
>
> Has anybody successfully ported NOR flash based file system on
> DAVINCI and
> successful in booting linux with flash file system?
> please let me know what changes to be made to the kernel for detecting
> the
> flash and where should I specify the memory map .
>
> thanks
> yogesh
>
>
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>
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