[U-Boot-Users] Uncompressing uImage: inflate() returned -3

[Amit Shah]

On Mon, 23 Aug 2004 19:14:55 +0200, Wolfgang Denk <wd at denx.de> wrote:
> In message <877aabc4040823073962e725a8 at mail.gmail.com> you wrote:
> >
> > Okay, so now there are issues when it's loading uImage: The uImage
> > built fails on the CRC. This is due to inconsistencies in the byte
> 
> In the subject you write about "inflate() returned  -3"  whis  sounds
> like a different issue to me.
> 
> > order of vmlinux.gz. When built on i386, it is CRC'ed in little
> > endian, while when it's being checked on the board, it gets CRC'ed in
> > big endian... so there will definitely be a mismatch in the two CRCs.
> > Or I'm overlooking something.
> 
> Yes, you are overlooking something. Both the CRC code in gzip and  in
> the  mkimage  tool  takes  care of endianess issues. This is NOT your
> problem.

Yep, shouldn't be.

> > So while generating the vmlinux.gz, I byteswapped it.. before feeding
> 
> Don't do this. This cannot work.
> 
> > Hmm, so setting 'verify' to 'n' also doesn't work; gunzip says
> > 'inflate returned -3'.. which is some Z_DATA_ERROR.
> 
> This just turns off the image  CRC  ch3ecking,  but  not  the  gunzip
> verification.

Yes. But if it really was the CRC going bad due to endian issues, the
gunzip should've worked well...

> > I'm obviously doing something wrong here, since this should've worked...
> 
> Did you simply try increasing your TFTP download address to something
> like 0x400000 or so?

I don't have an Ethernet interface. I transfer the uImage (as well as
u-boot) via PCI. The uImage is dumped to SDRAM, whereas u-boot is put
into flash.

> 
> Unfortunately you don't give any information how you  are  trying  to
> boot Linux; if you had given the exact command and the exact output I
> might have been able to provide better help.

Some output:

Top of RAM usable for U-Boot at: 00800000
Reserving 130k for U-Boot at: 007df000
Reserving 260k for malloc() at: 0079e000
Reserving 56 Bytes for Board Info at: 0079dfc8
Reserving 48 Bytes for Global Data at: 0079df98
Stack Pointer at: 0079df78
New Stack Pointer is: 0079df78

U-Boot relocated to 007df000

=> setenv verify n
=> printenv verify
verify=n
=> imi 40000

## Checking Image at 00040000 ...
   Image Name:   Linux-2.6.7
   Created:      2004-08-23  11:56:08 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1007143 Bytes = 983.5 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ...    Bad Data CRC
=> bootm 40000
## Booting image at 00040000 ...
   Image Name:   Linux-2.6.7
   Created:      2004-08-23  11:56:08 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1007143 Bytes = 983.5 kB
   Load Address: 00000000
   Entry Point:  00000000
   Uncompressing Kernel Image ... Error: inflate() returned -3
GUNZIP ERROR - must RESET board to recover

*** This is when I set 'verify' to 'n'.

=> bootm 40000
## Booting image at 00040000 ...
   Image Name:   Linux-2.6.7
   Created:      2004-08-23  11:15:57 UTC
   Image Type:   PowerPC Linux Kernel Image (gzip compressed)
   Data Size:    1007140 Bytes = 983.5 kB
   Load Address: 00000000
   Entry Point:  00000000
   Verifying Checksum ... OK
   Uncompressing Kernel Image ... Error: Bad gzipped data
GUNZIP ERROR - must RESET board to recover

*** And this output is when I have vmlinux.gz byteswapped before
feeding to mkimage.

I'll mention what I'm doing right now in reply to your next mail...

-- 
Amit Shah
http://amitshah.nav.to/