===== Chipsets =====

This page covers the core logic used on the [[hardware:motherboards|motherboards]]. Chipsets used only in Digital's and Compaq's own systems, such as Titan, Marvel, and Wildfire, are listed under [[#system_chipsets|System chipsets]] and described on the [[hardware:systems|system]] pages.

^ Chipset ^ CPUs ^ Motherboards ^ Linux code ^ Current kernels ^
| [[#21071_and_21072|21071/21072 (APECS)]] | [[wp>Alpha_21064|21064]], [[wp>Alpha_21064#Alpha_21064A|21064A]] | [[hardware:motherboards:eb64plus|EB64+]], [[hardware:motherboards:pc64|AlphaPC 64]] | ''core_apecs.c'' | Linux 6.9 and earlier |
| [[#21171|21171 (CIA)]] | [[wp>Alpha_21164|21164]] | [[hardware:motherboards:eb164|EB164]] | ''core_cia.c'' | Linux 6.9 and earlier |
| [[#21172|21172 (CIA-2)]] | [[wp>Alpha_21164#Alpha_21164A|21164A]] | [[hardware:motherboards:pc164|AlphaPC 164]] | ''core_cia.c'' | Supported |
| [[#21174|21174 (Pyxis)]] | [[wp>Alpha_21164#Alpha_21164A|21164A]], [[wp>Alpha_21164#Alpha_21164PC_(PCA56)|21164PC]] | [[hardware:motherboards:pc164lx|AlphaPC 164LX]], [[hardware:motherboards:pc164sx|AlphaPC 164SX]], [[hardware:motherboards:pc164ux|AlphaPC 164UX/BX]] | ''core_cia.c'' | Supported |
| [[#polaris|VLSI Polaris]] | [[wp>Alpha_21164#Alpha_21164PC_(PCA57)|21164PC]] | [[hardware:motherboards:pc164rx|AlphaPC 164RX]] | ''core_polaris.c'' | Untested |
| [[#21272|21272 (Tsunami/Typhoon)]] | [[wp>Alpha_21264|21264]] | [[hardware:motherboards:pc264dp|AlphaPC 264DP]], [[hardware:motherboards:up2000|UP2000]], [[hardware:motherboards:up2000#up2000plus|UP2000+]] | ''core_tsunami.c'' | Supported |
| [[#AMD-751|AMD-751 (Irongate)]] | [[wp>Alpha_21264|21264]] | [[hardware:motherboards:up1000|UP1000]], [[hardware:motherboards:up1100|UP1100]] | ''core_irongate.c'' | Supported |
| [[#AMD-761|AMD-761]] | [[wp>Alpha_21264|21264]] | [[hardware:motherboards:up1500|UP1500]] | ''core_irongate.c'' | Supported |

The Linux code column names the file in ''arch/alpha/kernel'' that supports the chipset. The APECS and LCA files were removed with support for processors older than the EV56 (21164A) in Linux 6.10; [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/Makefile?h=v6.9|arch/alpha/kernel/Makefile]], Linux 6.9)] [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/Makefile?h=v7.3-rc1|arch/alpha/kernel/Makefile]], Linux 7.3)] the CIA code remains for EV56 systems. The Current kernels column uses the same values as the [[hardware:motherboards|Motherboards]] table.

The [[wp>Alpha_21064#Alpha_21066A|21066 and 21066A]] integrate their memory and PCI controllers, so boards such as the [[hardware:motherboards:eb66|EB66]] and [[hardware:motherboards:eb66plus|EB66+]] need no separate chipset. Linux supported them with ''core_lca.c'' through Linux 6.9.

==== System chipsets ====

The kernel also has core logic support for chipsets that appear only in Digital's and Compaq's systems. Whether a system runs current kernels depends on its processor as well; see the Linux column of the [[hardware:systems|Systems]] table.

^ Chipset ^ Systems ^ Linux code ^
| T2 | [[hardware:systems:sable|AlphaServer 2000, 2100 (Sable)]], [[hardware:systems:lynx|AlphaServer 2100A (Lynx)]] | ''core_t2.c'' |
| MCPCIA (MCbus to PCI adapter) | [[hardware:systems:rawhide|AlphaServer 1200, 4000, 4100 (Rawhide)]] | ''core_mcpcia.c'' |
| Wildfire | [[hardware:systems:wildfire|AlphaServer GS80, GS160, GS320]] | ''core_wildfire.c'' |
| Titan | [[hardware:systems:titan|AlphaServer DS25, ES45]] | ''core_titan.c'' |
| IO7 (Marvel) | [[hardware:systems:marvel|AlphaServer ES47, ES80, GS1280]] | ''core_marvel.c'' |

The kernel configuration names the systems each platform covers, and builds the T2 code for Sable and the MCPCIA code for Rawhide. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/Kconfig?h=v7.3-rc1|arch/alpha/Kconfig]], Linux 7.3)] ''sys_sable.c'' covers the Sable, Sable-Gamma, and Lynx systems, and ''core_t2.c'' serves both Sable and Lynx, [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_t2.c?h=v7.3-rc1|arch/alpha/kernel/core_t2.c]], Linux 7.3)] [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/sys_sable.c?h=v7.3-rc1|arch/alpha/kernel/sys_sable.c]], Linux 7.3)] ''core_mcpcia.c'' is the "code common to all MCbus-PCI Adaptor core logic chipsets", [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_mcpcia.c?h=v7.3-rc1|arch/alpha/kernel/core_mcpcia.c]], Linux 7.3)] and ''core_marvel.c'' manages the IO7 chips of the EV7 systems. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_marvel.c?h=v7.3-rc1|arch/alpha/kernel/core_marvel.c]], Linux 7.3)] The Titan and Wildfire code is in ''core_titan.c'' and ''core_wildfire.c''. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_titan.c?h=v7.3-rc1|arch/alpha/kernel/core_titan.c]], Linux 7.3)] [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_wildfire.c?h=v7.3-rc1|arch/alpha/kernel/core_wildfire.c]], Linux 7.3)]

==== 21071 and 21072 ====

The 21071 and 21072 are "two configurations of a core logic chip set for the DECchip 21064 family", providing a 32-bit PCI interface, cache and memory control, and the data paths between them. Digital shipped them with the [[hardware:motherboards:eb64plus|EB64+]] evaluation kit, "an example PC mother board" that also served as the debug platform for the chips, with the aim of letting designers build uniprocessor Alpha systems "with minimal design and engineering effort". [(>[[https://github.com/alphalinux/mailing-list-archives/blob/main/biz-digital-articles-mbox/googlegroups-1994-September.mbox#L5135|"Development of Digital's PCI Chip Sets and Evaluation Kit for the DECchip 21064 Microprocessor"]], Samyojita A. Nadkarni et al., Digital Technical Journal, biz.digital.articles, 17 Sep 1994)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:21071:21071_21072_data_sheet.pdf?linkonly|DECchip 21071 and DECchip 21072 Core Logic Chipsets Data Sheet}} | EC-QAEMB-TE | January 1996 |
| {{wiki:hardware:chipsets:21071:21071-aa_21072-aa_data_sheet_1993.pdf?linkonly|DECchip 21071-AA and 21072-AA Chipsets Data Sheet}} | EC-N0648-72 | November 1993 |

==== 21171 ====

The 21171 (CIA) is the core logic of the [[hardware:motherboards:eb164|EB164]] and of EV5 systems such as the AlphaStation 500 and 600 (Alcor). Linux supports it in ''core_cia.c'', which also handles the 21172 and 21174. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_cia.c?h=v7.3-rc1|arch/alpha/kernel/core_cia.c]], Linux 7.3)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:21171:21171_technical_reference_manual.pdf?linkonly|DECchip 21171 Core Logic Chipset Technical Reference Manual}} | EC-QE18B-TE | September 1995 |
| {{wiki:hardware:chipsets:21171:21171_product_brief.pdf?linkonly|DECchip 21171 Core Logic Chipset Product Brief}} | EC-QC3EB-TE | March 1995 |

==== 21172 ====

The 21172 (CIA-2) is the core logic of the [[hardware:motherboards:pc164|AlphaPC 164]]. Although it was intended to allow byte and word access to I/O space, this never worked, so Linux uses sparse I/O addressing on it as on the 21171. [(>[[https://github.com/alphalinux/mailing-list-archives/blob/main/axp-list-mbox/1998-March.mbox#L18328|"RE: Re: ev56 optimization -> illegal instruction"]], Jay Estabrook, axp-list, 14 Mar 1998)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:21172:21172_technical_reference_manual.pdf?linkonly|Digital Semiconductor 21172 Core Logic Chipset Technical Reference Manual}} | EC-QUQJA-TE | April 1996 |
| {{wiki:hardware:chipsets:21172:21172_product_brief.pdf?linkonly|Digital Semiconductor 21172 Core Logic Chipset Product Brief}} | EC-QUQHA-TE | March 1996 |

==== 21174 ====

Early 21174 (Pyxis) parts have an erratum affecting DMA that crosses a page boundary when the scatter-gather hardware is in use, [(>[[https://github.com/alphalinux/mailing-list-archives/blob/main/debian-alpha-mbox/2003-October.mbox#L3263|"Re: pci cards supported by SRM?"]], Jay Estabrook, debian-alpha, 9 Oct 2003)] which operating systems must work around. NetBSD prints a warning when it detects a pass 1 Pyxis. [(>[[https://github.com/alphalinux/mailing-list-archives/blob/main/netbsd-port-alpha-mbox/1998-July.mbox#L4288|"Miata"]], Johan Danielsson, port-alpha, 28 Jul 1998)] On the Personal Workstation (Miata), the PCI-to-PCI bridge in front of the 32-bit slots masks the bug; see [[hardware:other#personal_workstation_64-bit_slots|Other Hardware]] for the 64-bit slots, which are not behind it.

Pyxis was also the first Alpha core logic on which byte and word access to I/O space worked, and Linux enables it on every Pyxis system; [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_cia.c?h=v7.3-rc1|arch/alpha/kernel/core_cia.c]], Linux 7.3)] see [[documentation:porting:byte_word_access#bwx_in_the_core_logic|Byte and Word Access]].

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:21174:21174_technical_reference_manual.pdf?linkonly|Digital Semiconductor 21174 Core Logic Chip Technical Reference Manual}} | EC-R12GB-TE | August 1997 |

==== Polaris ====

The VLSI Technology Polaris system controller is used only on the [[hardware:motherboards:pc164rx|AlphaPC 164RX]]. It supports only 32-bit PCI. [(>[[https://github.com/alphalinux/mailing-list-archives/blob/main/axp-list-mbox/2002-January.mbox#L2348|"Re: Kernel 2.4.17"]], Jay Estabrook, axp-list, 8 Jan 2002)] Linux supports it in ''core_polaris.c''. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_polaris.c?h=v7.3-rc1|arch/alpha/kernel/core_polaris.c]], Linux 7.3)]

==== 21272 ====

The 21272 (Tsunami, and the later Typhoon) is the core logic of the 21264 motherboards and of the AlphaServer DS10, DS20, and ES40 families. Linux supports it in ''core_tsunami.c''. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_tsunami.c?h=v7.3-rc1|arch/alpha/kernel/core_tsunami.c]], Linux 7.3)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:21272:21272_hardware_reference_manual.pdf?linkonly|Tsunami/Typhoon 21272 Chipset Hardware Reference Manual, Revision 4.0}} | DS-0025A-TE | October 1999 |

==== AMD-751 ====

The AMD-751 (Irongate) is an Athlon system controller, used with the 21264 on the [[hardware:motherboards:up1000|UP1000]] and [[hardware:motherboards:up1100|UP1100]]. Linux supports it, and the AMD-761, in ''core_irongate.c''. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_irongate.c?h=v7.3-rc1|arch/alpha/kernel/core_irongate.c]], Linux 7.3)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:amd-751:amd-751_data_sheet.pdf?linkonly|AMD-751 System Controller Data Sheet}} | 21910E | March 2000 |

==== AMD-761 ====

The AMD-761 is an Athlon system controller with a DDR SDRAM memory interface, [(>{{wiki:hardware:chipsets:amd-761:amd-761_software_bios_design_guide.pdf?linkonly|AMD-761 System Controller Software/BIOS Design Guide}}, p. 149)] used on the [[hardware:motherboards:up1500|UP1500]]. ''core_irongate.c'' supports it and tells it apart from the AMD-751 by device ID, since the two keep their ECC status in different registers. [(>[[https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/arch/alpha/kernel/core_irongate.c?h=v7.3-rc1|arch/alpha/kernel/core_irongate.c]], Linux 7.3)]

^ Document ^ Part number ^ Date ^
| {{wiki:hardware:chipsets:amd-761:amd-761_software_bios_design_guide.pdf?linkonly|AMD-761 System Controller Software/BIOS Design Guide}} | 24081D | February 2002 |

{{tag>hardware}}