[U-Boot-Users] Boot from Compact Flash

[Thomas Lange <thomas@corelatus.com>]

There seems to be a hw problem with the au1x00 series and
pcmcia ( as you can see from the comment you attached ).

I have reported this to AMD and they are "looking into it".

This affects all data read/written from/to CF. For workaround
see board/dbau1x00/README

I have only used au1000 in big endian mode, so I cannot tell
what happens in little.

/Thomas

Ed Okerson wrote:
>   My BDI2000 is due to arrive today, I'm just waiting for FedEx to show
> up.  In the meantime, I managed to get u-boot to run from RAM, so I wanted
> to get a head start on booting from Compact Flash.  I have a 256MB CF card
> in a PCMCIA adapter.  When I insert this in a Linux Laptop, it properly
> reports it as a SanDisk 256MB CF card.  I managed to get u-boot to build
> Little Endian, and in that mode when I insert the PCMCIA it reports it as:
> 
> Reset IDE: Bus 0: OK
>   Device 0: Model: aSDnsi kDSFC-B52 6 Firm: dV g.812. Ser#:
> 1144901E09P30101
>             Type: Removable Hard Disk
>             Capacity: 117964.8 MB = 115.2 GB (-1476395001 x 512)
> 
> Obviousle the endian-ness is wrong.  I tracked to the code in
> common/cmd_ide.c where there is a note:
> 
> /* We only need to swap data if we are running on a big endian cpu. */
> /* But Au1x00 cpu:s already swaps data in big endian mode! */
> #if defined(__LITTLE_ENDIAN) || defined(CONFIG_AU1X00)
> #define input_swap_data(x,y,z) input_data(x,y,z)
> 
> Where is the bit getting set that tells the Au1500 to swap bytes?  If I
> build u-boot as big endian, it properly recognizes the CF card.
> 
> I am using the BdAu1500 board.
> 
> Is there a discussion somewhere about the pros/cons of running in
> big/little endian mode?
> 
> Ed Okerson
> 
> 
> 
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