Re: [Linux-gpib-general] Installing DKMS driver on Ubuntu 26.04

[David G. <dav...@po...>]

On 6/4/26 12:51 PM, dave penkler wrote:
> Hi David,
> I built a 7.0.11 kernel and installed the 4.3.7 modules and 
> successfully tested it with the sequence below.
> My conclusion at this point is that your system is not routing the irq's 
> correctly.
> What does
> cat /proc/interrupts | grep ni-pci
> show when you let the system route the irq's itself.

Thanks so much for your time on my issue!  I am lost.

$ cat /proc/interrupts | grep ni-pci
   20:          0          0          0          0       2955          0 
  IO-APIC   20-fasteoi   ohci_hcd:usb5, ni-pci-gpib

It is shared with my keyboard.  I have moved the keyboard and mouse to 
different USB ports and now I can confirm that this doesn't increment

$ watch -n 0.1 'cat /proc/interrupts | grep "20:"'


Regarding 
/usr/src/linux-gpib-4.3.7/drivers/gpib/tnt4882/tnt4882_gpib.c:63 for 
tnt_paged_readb(), would this be more correct or am I just thinking this 
all wrong?

static inline unsigned int tnt_paged_readb(struct tnt4882_priv *priv, 
unsigned long offset) {
     unsigned int val;

     // 1. Write the page-in command
     iowrite8(AUX_PAGEIN, priv->nec7210_priv.mmiobase + AUXMR * 
priv->nec7210_priv.offset);

     // 2. Force full synchronization: Write MUST complete before Read 
starts
     mb();

     // 3. Read the data from the newly established page
     val = ioread8(priv->nec7210_priv.mmiobase + offset);

     // 4. Force Read completion before the function returns or next 
instructions run
     rmb();

     return val;
}