question about r128_driver.c

Hello,

In the initialization, why are pll->min_pll_freq and pll->max_pll_freq 
taken from R128_BIOS32, when pll->reference_freq, pll->reference_div,
and pll->xclk are taken from R128_BIOS16?

Relevant code section:

    if (!info->VBIOS) {
        xf86DrvMsg(pScrn->scrnIndex, X_WARNING,
                   "Video BIOS not detected, using default PLL 
parameters!\n");
                                /* These probably aren't going to work for
                                   the card you are using.  Specifically,
                                   reference freq can be 29.50MHz,
                                   28.63MHz, or 14.32MHz.  YMMV. */
        pll->reference_freq = 2950;
        pll->reference_div  = 65;
        pll->min_pll_freq   = 12500;
        pll->max_pll_freq   = 25000;
        pll->xclk           = 10300;
    } else {
        CARD16 bios_header    = R128_BIOS16(0x48);
        CARD16 pll_info_block = R128_BIOS16(bios_header + 0x30);
        R128TRACE(("Header at 0x%04x; PLL Information at 0x%04x\n",
                   bios_header, pll_info_block));

        pll->reference_freq = R128_BIOS16(pll_info_block + 0x0e);
        pll->reference_div  = R128_BIOS16(pll_info_block + 0x10);
        pll->min_pll_freq   = R128_BIOS32(pll_info_block + 0x12);
        pll->max_pll_freq   = R128_BIOS32(pll_info_block + 0x16);
        pll->xclk           = R128_BIOS16(pll_info_block + 0x08);
    }



Case