Embedded PC IDE Flash Questions

Joel Sherrill joel.sherrill at OARcorp.com
Thu May 28 01:39:36 UTC 2009

Chris Johns wrote:
> Joel Sherrill wrote:
>> Hi,
>> I have a Winsystems EBC-855 and am trying to
>> access the CompactFlash.  It is on
>> IDE1 and nothing is on IDE0 so I enabled the
>> secondary IDE/
> With the latest build from CVS you can control the IDE controller table 
> via kernel command line options. The option is '--ide=1,2' or for you 
> '--ide='2'. I suggest you leave off all configure/make command line 
> options for the i386 BSP and use command line arguments. You need to use 
> the multiboot kernel image for command lines.
OK.  Tomorrow's project. :)

I did build with the configure.ac flag to enable IDE1.  That
at least made the device show up.
>> http://sbc.winsystems.com/products/ebc-855.cfm
>> The IDE Flash is formatted for DOS and will boot
>> DOS.  I used the telnetd example with the DOS FS
>> support enabled.  The drive is showing up as
>> /dev/hdc but the system locks up when I
>> try to "fdisk /dev/hdc register" or
>> "fdisk /dev/hdc" to look at the partition table.
>> Any thoughts from someone who has done this
>> before?
> This is typical of a low level IDE issue where timeouts are happening. I 
> do know the command line will not include the IDE1 controller details in 
> the IDE configuration table so if you could use this option we would 
> know there is no IDE1 configuration details in the table.
OK. I will try this again tomorrow.
> I have noticed with qemu I cannot access the second IDE2 controller. I 
> had assumed this was a qemu to disk mapping issue that caused the 
> problem when I tried. I have IDE1 as a disk image (file on host 
> formatted as a disk) and that works well and IDE2 mapped to a host 
> directory so I can load a kernel. Grub can see this IDE2 disk and it 
> loads my kernel from it. With your problem I am wondering if there is a 
> bug the IDE2 support. I know qemu has a CDROM present on the second IDE 
> controller. I will take another look into the IDE2 problem with qemu.
Thanks.  I didn't try anything with the 2nd IDE on qemu.  I
was happy to even be able to mount the vfat and do an ls.
But when I did "cp test.exe joel" it succeeded but nothing
showed up.  Is this just a qemu issue?
> Do you happen to have a CDROM connected as well, ie ATAP type device ?
No.  Nothing attached at all.  The IDE0 cable isn't even attached
to the motherboard.
> Regards
> Chris

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