Hallo Wolfgang,

...

I'm interested in booting a linux image from a USB memory stick. I configured u-boot (version 1.1.2) to provide me with the usb commands. I try to load the image with the following commands. usb rest

rest or reset?

reset, of course. Just a typo ;-)

...

Loading from USB device 0, partition 1: Name: usbda1 Type: U-Boot First Block: 32, # of blocks: 255456, Block Size: 512

** Bad Magic Number **

Ummm... the number of blocks is obviously bogus - 255456 blocks is 124 MB; I don't think that's the real size of your kernel image. Probably you made some error when storing the image to the USB stick.

Just played around with my usb stick and reduced the size of the first partition. When I now try the usbboot command the number of blocks is exact the size of the partition. Is there a special way of creating the image or can I use the same I use with the tftp command?

How did you write the image to the USB stick?

I tried to follow DULG -booting from IDE, Compact Flash. Maybe it was not a good idea... Copied it from my host to the stick. This is not the proper way?

Can you tell me which fs to use? I tried it with dos.

Mit freundlichem Gruß, Jonas

Hallo Wolfgang,

...

Just played around with my usb stick and reduced the size of the first partition. When I now try the usbboot command the number of blocks is exact the size of the partition.

This doesn't make sense.

I did the following steps:

A9M9750 # usb part print_part of 0

Partition Map for USB device 0 -- Partition Type: DOS

Partition Start Sector Num Sectors Type 1 1 10239 83 2 10240 10240 83 3 20480 235520 83

A9M9750 # usbboot 10000 0:1

Loading from USB device 0, partition 1: Name: usbda1 Type: U-Boot First Block: 1, # of blocks: 10239, Block Size: 512

** Bad Magic Number **

Ok, let me see if the image on the stick is corrupt. I loaded it with the fatload command. A9M9750 # fatload usb 0:1 10000 uImage reading uImage ...............................................................................................................

1144120 bytes read A9M9750 # bootm ## Booting image at 00010000 ... Image Name: Linux-2.6.10-fs1 Created: 2005-02-02 13:23:01 UTC Image Type: ARM Linux Kernel Image (uncompressed) Data Size: 1144056 Bytes = 1.1 MB Load Address: 00008000 Entry Point: 00008000 Verifying Checksum ... OK OK

And it works. Nice. But whats going/I'm doing wrong with the usbboot command?

Does the "usbboot" command print the image header? Does the data look correct, especially the image size?

Not at all. So

Try adding some debug prints to "common/cmd_usb.c"; like here:

396         hdr = (image_header_t *)addr;
397
398         if (hdr->ih_magic == IH_MAGIC) {
399                 print_image_hdr (hdr);
400                 cnt = (hdr->ih_size + sizeof(image_header_t));
401                 cnt += info.blksz - 1;
402                 cnt /= info.blksz;
403                 cnt -= 1;
404         } else {
405                 printf("\n** Bad Magic Number **\n");
406                 return 1;
407         }

I put the print_image_hdr() before the if clause, but as expected I only get garbage. Image Name: Created: 2024-06-19 15:57:52 UTC Image Type: Invalid CPU Invalid OS Invalid Image (uncompressed) Data Size: 33816832 Bytes = 32.3 MB Load Address: 020002fe Entry Point: 27f80800

Gruß, Jonas

Hallo Wolfgang,

...

A9M9750 # usbboot 10000 0:1

Loading from USB device 0, partition 1: Name: usbda1 Type: U-Boot First Block: 1, # of blocks: 10239, Block Size: 512

** Bad Magic Number **

Ok, let me see if the image on the stick is corrupt. I loaded it with the fatload command.

fatload? FATLOAD??? You mean you have a FAT filesystem on that partition???

:-O hope you havn't got a heart attack...

Than why do you try using usbboot? usbboot like diskboot try to load an U-Boot image from a RAW partition, i. e. without any filesystem on it.

I thought you told me that you tested it with a FS.... Maybe I misunderstood something. Ok, put my image to the RAW partiton and executed usbboot again. Still the same problem like above... Copied the image into RAM with usb read (hope it is correct) and then bootm. That works. Then I removed the "if (hdr->ih_magic == IH_MAGIC)" in common/cmd_usb.c, set cnt to a suitable value and tested usbboot again. This works, too.

Perhaps I find out how to solve that.

Thanks for your help!

Regards, Jonas