5.18. Renesas SHEth - emllSHEth

The parameters to the Renesas SuperH Ethernet Link Layer are setup-specific. The function CreateLinkParmsFromCmdLineSHEth() in EcSelectLinkLayer.cpp demonstrates how to initialize the Link Layer instance.

struct EC_T_LINK_PARMS_SHETH

Public Members

EC_T_LINK_PARMS linkParms

Common link parameters. Signature must be set to EC_LINK_PARMS_SIGNATURE_SHETH

EC_T_SHETH_TYPE eType

System on Chip type

EC_T_BYTE abyStationAddress[6]

MAC address

EC_T_DWORD dwBaseAddr

Physical address of register block

EC_T_BYTE byPhyAddr

PHY address

EC_T_BOOL bNotUseDmaBuffers

EC_TRUE: copy buffer before processing, EC_FALSE: Use buffers from DMA (default)

EC_T_DWORD dwTxDmaDesCnt

Transmit DMA descriptor buffer count. Must be a power of 2, maximum 256

EC_T_DWORD dwRxDmaDesCnt

Receive DMA descriptor buffer count. Must be a power of 2, maximum 256

enum EC_T_SHETH_TYPE

Values:

enumerator eSHEth_R8A777X

Renesas R8A777X

enumerator eSHEth_R8A779X

Renesas R8A779X

enumerator eSHEth_SH7724

Renesas SH7724

enumerator eSHEth_SH7757

Renesas SH7757

enumerator eSHEth_SH7757_GIGA

Renesas SH7757_GIGA

enumerator eSHEth_SH7734

Renesas SH7734

enumerator eSHEth_SH7763

Renesas SH7763

enumerator eSHEth_R8A7740

Renesas R8A7740

enumerator eSHEth_R7S72100

Renesas R7S72100

enumerator eSHEth_SH7619

Renesas SH7619

enumerator eSHEth_SH771X

Renesas SH771X

enumerator eSHEth_R8A77400

Renesas R8A77400

enumerator eSHEth_R8A77435

Renesas R8A77435

enumerator eSHEth_R8A77430

Renesas R8A77430

enumerator eSHEth_R8A77450

Renesas R8A77450

5.18.1. SHEth link status update

On some targets like Armadillo A800 eva the link status can’t be obtained directly by reading MAC PHY status register without access to the MII bus. Accessing the bus would violate timing constraints and is therefore not possible.

The following IOCTL updates the link status and accesses the PHY. The IOCTL is blocking and may therefore be not called from the JobTask’s context.

dwRes = esIoControl(dwSimulatorInstanceId, EC_IOCTL_LINKLAYER | EC_LINKIOCTL_UPDATE_LINKSTATUS, EC_NULL);

ecLinkGetStatus() always retuns the last known link status.

5.18.2. SHEth usage under Linux

Due to lacking unbind-feature of the SuperH driver, the target’s Kernel must not load the SuperH driver when starting. If the SuperH was built as a module, it can be renamed to ensure, it never gets loaded. If it was compiled into the Kernel, the Kernel needs to be recompiled without it.