Hello Ulrich,
> mem =12 M
i think it means the kernel knows about 12 MB
This code below works fine at our board, but we use only a few kb in the
protected ram.
I don't Know whats happen if size is bigger as one page.
int asi_common_mmap(struct file *filp, struct vm_area_struct *vma)
{
// unsigned long off = vma->vm_pgoff << PAGE_SHIFT;
unsigned long physical = ASI_IOMEM_BASE;
unsigned long vsize = vma->vm_end - vma->vm_start;
// unsigned long psize = ASI_IOMEM_SIZE - off;
// rt_printk("start : 0x%08lX\n", vma->vm_start);
// rt_printk("end : 0x%08lX\n", vma->vm_end);
// rt_printk("offset: 0x%08lX\n", off);
// rt_printk("phys : 0x%08lX\n", physical);
// rt_printk("vsize : 0x%08lX\n", vsize);
// rt_printk("psize : 0x%08lX\n", psize);
if (filp->f_flags & O_SYNC)
{
// rt_printk("I/O-Mem");
vma->vm_flags |= VM_IO;
}
vma->vm_flags |= VM_RESERVED;
//if (vsize > psize) return -EINVAL; /* spans too high */
if(remap_page_range(vma->vm_start, physical, vsize, vma->vm_page_prot))
{
return -EAGAIN;
}
return(0);
}
Achim
