[syslinux] [syslinux:master] PXE ISR: Force polling on select hardware WORKAROUND

[H. Peter Anvin]

On 07/13/2014 10:54 AM, syslinux-bot for Gene Cumm wrote:
> Commit-ID:  3741886cb700e1017d70f1753f013fa10f4d9272
> Gitweb:     http://www.syslinux.org/commit/3741886cb700e1017d70f1753f013fa10f4d9272
> Author:     Gene Cumm <gene.cumm at gmail.com>
> AuthorDate: Sun, 13 Jul 2014 11:18:50 -0400
> Committer:  Gene Cumm <gene.cumm at gmail.com>
> CommitDate: Sun, 13 Jul 2014 11:18:50 -0400
> 
> PXE ISR: Force polling on select hardware WORKAROUND
> 
> Like 2fe3a7bd, certain Dell machines (OptiPlex 990) state interrupts
> should work but effectively don't.  Force polling.
> 
> Reported-by: Alexander Perlis <aperlis at math.lsu.edu>
> Signed-off-by: Gene Cumm <gene.cumm at gmail.com>
> 
> ---
>  core/fs/pxe/isr.c | 5 ++---
>  1 file changed, 2 insertions(+), 3 deletions(-)
> 
> diff --git a/core/fs/pxe/isr.c b/core/fs/pxe/isr.c
> index d0a0bf9..ddaadf9 100644
> --- a/core/fs/pxe/isr.c
> +++ b/core/fs/pxe/isr.c
> @@ -266,11 +266,10 @@ void pxe_start_isr(void)
>  	dprintf("pxe_start_isr: trying poll by model\n");
>  	int hwad = ((int)MAC[0] << 16) + ((int)MAC[1] << 8) + MAC[2];
>  	dprintf("pxe_start_isr: got %06x %04x\n", hwad, pxe_undi_iface.ServiceFlags);
> -	if (hwad == 0x000023ae) {
> -	    if (pxe_undi_iface.ServiceFlags == 0xdc1b) {
> +	if ((hwad == 0x000023ae) && (pxe_undi_iface.ServiceFlags == 0xdc1b) ||
> +	    (hwad == 0x00180373) && (pxe_undi_iface.ServiceFlags == 0xdc1b)) {
>  		asm volatile("orb $1,%0" : "+m" (pxe_need_poll));
>  		dprintf("pxe_start_isr: forcing pxe_need_poll by model\n");
> -	    }
>  	}
>      }

Thank you.  I'm wondering if we also should force polling on if we have
gotten no interrupts after a number of transmit attempts.

	-hpa