Messages in this thread | | | Subject | Re: How to invoke burst-read on PCI mapped memory area | Date | Wed, 14 Oct 98 20:43:03 +0900 | From | Hiroshi Kawashima <> |
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Many thanks for much reply!
> > If I believe word of my colleague (I believe), 440BX chipset must have such > > capability. (To convert burst-read (aka cache line fill) on host bus > > to burst-read transaction on PCI) > > I do not have enough time to validate his word right now, but does this > > behavior sounds so strange ? > > not so much. I have no trouble to believe that BX's have such a cabability > (at last !!) but the point is that it's not a WinNT feature, but a BX one. Of course, I know. But from my understanding, Linux (at least v2.0.X) does not have such feature (vremap() with cache attribute control). I dislike Windoze, but WinNT has it.
> If you could 'track' your colleague to get some information on the > register to tweek, you'd be useful to a lot of people. > In the mean time, i'll try to download BX specs from Intel site. > regards. He do not touch anything about chipset/cpu register setting.
He just use following WinNT system call: MmMapIoSpace( mappedAddr, // Physical Address memCount[i], // Number of Bytes (Memory map size) cacheEnable); // CacheEnable Rest of jobs are done by WinNT executive.
By the way, I'm porting device driver written for 2.0.X to 2.1.X to use __ioremap() call. Almost completed, other than one point.
In mmap_xxxx() function, I use vma->vm_inode like this:
int chigasaki_mmap(struct inode *inode, struct file *filp, struct vm_area_struct *vma) { ...... vma->vm_inode = inode; inode->i_count++; }
But on v2.1.X, vm_inode member is missing from struct vm_area_struct. Would anyone help me how should I rewrite this ?
Thank you in advance.
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