| To: | |
|---|---|
| Subject: | Re: [ts-7000] LCD Display with TS-7250 |
| From: | "Jesse Off" <> |
| Date: | Wed, 20 Apr 2005 15:35:50 -0700 |
The TS7250 requires an extra option to the open("/dev/mem".. system call.
The flags parameter must be O_RDWR|O_SYNC (not O_RDWR). Unless O_SYNC is
specified, Linux arbitrarily decides whether or not an uncacheable MMU
mapping is required based on the X86 specific notion of where the highest
block of physical SDRAM is located. The TS-7250 w/64MB SDRAM has a block
of memory in a high address which leads Linux to believe everything below it
in physical space is also SDRAM and may also be mapped as cacheable.
//Jesse Off
|
| <Prev in Thread] | Current Thread | [Next in Thread> |
|---|---|---|
| ||
| Previous by Date: | [ts-7000] LCD Display with TS-7250, Chris |
|---|---|
| Next by Date: | [ts-7000] Where to start?, williamvandiver2003 |
| Previous by Thread: | [ts-7000] LCD Display with TS-7250, Chris |
| Next by Thread: | [ts-7000] Where to start?, williamvandiver2003 |
| Indexes: | [Date] [Thread] [Top] [All Lists] |
Disclaimer: Neither Andrew Taylor nor the University of NSW School of Computer and Engineering take any responsibility for the contents of this archive. It is purely a compilation of material sent by many people to the birding-aus mailing list. It has not been checked for accuracy nor its content verified in any way. If you wish to get material removed from the archive or have other queries about the archive e-mail Andrew Taylor at this address: andrewt@cse.unsw.EDU.AU