Difference between revisions of "Developer Manual/Super IO"
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Some Super I/O's use register 0x30 of one of the logical device numbers (LDN) to also enable other logical device's functions. | Some Super I/O's use register 0x30 of one of the logical device numbers (LDN) to also enable other logical device's functions. | ||
For example, in the case of the W83627EHF chip, register 0x30 of LDN 0x9 was used to enable multiple devices (GPIO2 = bit0, GPIO3 = bit1, GPIO4 = bit2 and GPIO5 = bit3). To overcome this issue a concept of virtual LDN has been [https://www.coreboot.org/pipermail/coreboot/2008-February/030912.html introduced]. | For example, in the case of the [http://media.digikey.com/pdf/Data%20Sheets/Nuvoton%20PDFs/W83627EHx_EG_EFc.pdf W83627EHF chip], register 0x30 of LDN 0x9 was used to enable multiple devices (GPIO2 = bit0, GPIO3 = bit1, GPIO4 = bit2 and GPIO5 = bit3). To overcome this issue a concept of virtual LDN has been [https://www.coreboot.org/pipermail/coreboot/2008-February/030912.html introduced]. | ||
Virtual LDN's can be used in Coreboot to uniquely map the enable bit position in register 0x30 of an LDN, this allows to use a general way to handle any bit enable operation required without special cases. | Virtual LDN's can be used in Coreboot to uniquely map the enable bit position in register 0x30 of an LDN, this allows to use a general way to handle any bit enable operation required without special cases. | ||