I want to get the OS image running on pxa255. I have several questions 1> TIll now i was just making OS image (uImage ) and loading it to RAM and then to flash. When i load the image to RAM and execute iminfo 0xa0800000 i get the image info with valid checksum. o/p>>> SWAP$ tftp 0xa0800000 uImage_gzip Using MAC Address 00:04:34:00:21:59 TFTP from server 192.168.37.202; our IP address is 192.168.36.173 Filename 'uImage_gzip'. Load address: 0xa0800000 Loading: T #T ################################################################ ################################################################# ##################### done Bytes transferred = 771969 (bc781 hex)

SWAP$ iminfo 0xa0800000 ## Checking Image at a0800000 ... Image Name: Linux Kernel Image Image Type: ARM Linux Kernel Image (gzip compressed) Data Size: 771905 Bytes = 753.8 kB Load Address: a0800000 Entry Point: a0800000 Verifying Checksum ... OK o/p<<<

After erasing the relevant memory in flash when i transfer the OS image to flash using cp.b 0xa0800000 0x40000 0xbc781(size) i can tranfer the image successfully, but when i do iminfo 0x40000 i get the result as Verifying Checksum .. Bad DATA CRC. the iminfo in both cases transfers exactly the same size data,

o/p>>> SWAP$ erase 0x40000 0x1fffff ....... done Erased 7 sectors

SWAP$ cp.b 0xa0800000 0x40000 0xbc781 Copy to Flash... done

SWAP$ iminfo 0x40000 ## Checking Image at 00040000 ... Image Name: Linux Kernel Image Image Type: ARM Linux Kernel Image (gzip compressed) Data Size: 771905 Bytes = 753.8 kB Load Address: a0800000 Entry Point: a0800000 Verifying Checksum ... Bad Data CRC o/p<<<

Why do i get this error.

2> Using the uImage in RAM, when i try to execute it using bootm from the RAM. i get the following output

o/p>>> SWAP$ bootm 0xa0800000 ## Booting image at a0800000 ... Image Name: Linux Kernel Image Image Type: ARM Linux Kernel Image (gzip compressed) Data Size: 771905 Bytes = 753.8 kB Load Address: a0800000 Entry Point: a0800000 Verifying Checksum ... OK Uncompressing Kernel Image ... OK

B4 starting kernel Starting kernel ...

B4 cleanup After cleanup o/p<<<

I had just putup few printf statements to know exactly where the System hangs. It hangs during the callto function theKernel. Which receives the bootparams.

After reading the manual, REadme and a few posts i came to know that the bootargs were set to NFSboot. but the bootargs env variable was not properly configured. As per my understanding it is mandatory to either specify root file system as INIT RAM DISK or NFS for the OS to boot. Is it?

3> I would be able to prepare uRamdisk using mkimage, but that requires an image data file SIMPLE-ramdisk.image.gz to be specified with the -d switch. How do i make the SIMPLE-ramdisk.image.gz so that i can make uRamdisk. OR from where do i find SIMPLE-ramdisk.image. for ARM processor

Regards, Swapnil Narkhede Mob:- 0432025023 Email:- s3092131@student.rmit.edu.au School of Computer Science and Information Technology RMIT University, Melbourne