[syslinux] Read disk not working in 3.35+

[H. Peter Anvin]

Ram Yalamanchili wrote:
> Hey,
> 
> Looks like read disk function which was launched in 3.35 isnt working.
> Did anyone test this on any hardware? I'm using it thru the com32
> interface to read contents of the active partition of a USB boot key
> (syslinux).
> 
> I did a sample test like:
> 
> void scanAndPrint()
> {
>    com32sys_t regs_in;
>    char *sectorBuf = __com32.cs_bounce;
>    int i;
>    memset(sectorBuf, 0x0, 512); // XXX MARK 1
> 
>    for (i=0; i< 10; i++) {
>       int j;
> 
>       memset(&regs_in, 0, sizeof regs_in);
>       regs_in.eax.l = 0x0019;
>       regs_in.edx.l = i; // sector number
>       regs_in.ecx.l = 1; // sector count
>       regs_in.es = SEG(sectorBuf);
>       regs_in.ebx.w[0] = OFFS(sectorBuf);
>       __intcall(0x22, &regs_in, NULL);
> 	
>       printf("%d: ", i);
>       for (j =0; j < 512; j++) {
> 	 if (sectorBuf[j] != 0)
> 	 printf("%x", sectorBuf[j]);
>       }
>       printf(" .\n");
>    }
> }
> 

This doesn't work, since printf() uses the bounce buffer.

	-hpa