[U-Boot-Users] 405Gpr

Jerry Walden jwalden at digitalatlantic.com
Thu Feb 27 23:07:51 CET 2003

okay - makes sense.

So I have a few simple questions:

1)Is there a preffered place that I can put the initialization of
my CompactFlash card?

2)When I bootm xxxx_xxxx where xxxx_xxxx is in the CompactFlash - do I need
write a special read routine?  The only mode (I think) I can place the
device in is PC Card Memory Mode.  As I read the specs for this device, it
looks like
I'll need a loop before I read each word like:

while (not ready) {
  read CompactFlash Status Register
  mask what I read back
  if (mask == 0x00yy)
     ready = TRUE
read_a_16bit word.

Since the CompactFlash is a 16 bit device, do I need to change the bootm
code so that
I get all 32 bits?


Jerry Walden

-----Original Message-----
From: u-boot-users-admin at lists.sourceforge.net
[mailto:u-boot-users-admin at lists.sourceforge.net]On Behalf Of Wolfgang
Sent: Thursday, February 27, 2003 12:05 PM
To: jwalden at digitalatlantic.com
Cc: u-boot-users at lists.sourceforge.net
Subject: Re: [U-Boot-Users] 405Gpr

In message <EGEGIJHKDKJGAJMGIDPNOENOCHAA.jwalden at digitalatlantic.com> you
> Question is, should I put the Linux kernel in the boot rom and load from
> there,
> or should I place it in the SanDisk CompactFlash device we have on our
> board.
> The boot rom we are using (Am29LV40B) has 512K available, and the u-boot
> code
> that I have generated is about 175K.

512 - 175 = 337 kB. This is too  small  for  a  Linux  kernel  image,
leaving you little choice.

Best regards,

Wolfgang Denk

Software Engineering:  Embedded and Realtime Systems,  Embedded Linux
Phone: (+49)-8142-4596-87  Fax: (+49)-8142-4596-88  Email: wd at denx.de
"A fractal is by definition a set for which the Hausdorff Besicovitch
dimension strictly exceeds the topological dimension."
- Mandelbrot, _The Fractal Geometry of Nature_

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