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The SCBs for disconnected transactions are only of use to the controller when the transfer is resumed. Note that wide and twin channel features, although always supported by a particular chip, may be disabled in a particular motherboard or card design. The chip feature table adapttec the number of SCBs that can be stored in on-chip memory. Although the Ultra2 and Ultra products have sufficient instruction ram space to support both the initiator and target roles concurrently, this configuration is disabled in favor of allowing the target role to respond on multiple target ids.
Performance and feature sets vary throughout the aic7xxx product line.
Adaptec – Ubuntu LTS
Multi-function Twin Channel Device – Two controllers on one chip. In the mean time their recommendation is to use their pre-compiled Ubuntu binary which is built to work with the linux-image It should also be noted Microsemi also provide a precompiled binary for Ubuntu Home Questions Tags Users Unanswered.
The SCB contains all of the adaptwc required by the controller to process a transaction. So far I have found the only solution to this issue is to roll back to kernel version v4.
Controllers with this problem have a 42 MHz clock crystal on them and run slightly above 10MHz.
Driver features include support for twin and wide busses, fast, ultra or ultra2 synchronous transfers depending on controller type, tagged queueing, SCB paging, and target mode. I would guess this relates to the recent ‘retpoline’ patch to the Linux kernel to address the Spectre vulnerabilities.
The solution to this problem is SCB Paginga concept similar to memory paging. I was wondering if anyone was aware of a better remedy for this issue? Email Required, but never shown. Since the local SCB space serves as a cache for disconnected transactions, the more SCB space available, the less host bus traffic consumed saving and restoring SCB data.
Queuing Registers – Allows queueing of new transactions without pausing the sequencer.
Ubuntu 64bit and adaptec raid i2o 1020s Raid controller
The following table ubunru a comparison of the different chips supported by the ahc driver. Reselection in target mode fails to function correctly on all high voltage differential boards as shipped by Adaptec. SCB paging takes advantage of the fact that devices usually disconnect from the SCSI bus for long periods of time without talking to the controller.
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This allows the controller to queue up to transactions regardless of the amount of SCB space. Since upgrading from Linux kernel v4. Otherwise, the state of the adaptce recently disconnected and therefore most likely to stay disconnected SCB is saved, via dma, to host memory, and the local SCB reused to start the new transaction.
Looking at the kernel logs I see the following error messages, like: Block Move Instruction Support – Doubles the speed of certain sequencer operations. This restriction applies to all EISA and many motherboard configurations. Adqptec value assigned to this option should be a bitmap of all units where target mode is desired.
When the host queues another transaction for the controller to execute, the controller firmware will use a free SCB if one is available. Tagged Queuing is not supported in target mode.