a007837.rcw

/*
 * Work-around for erratum A-007837.
 *
 * Description:
 * SRIO supports training to 4x, 2x, and 1x port width modes
 * when the port is configured as 4x.
 * However, allowing 2x training in a 4x configuration may cause
 * 4x training to fail, resulting in downtraining to 2x mode of operation
 *
 * Impact:
 * Without the workaround, SRIO ports configured as 4x may downtrain to
 * 2x even in the absence of link errors.With the workaround, SRIO ports
 * configured as 4x that are unable to train to 4x because of link
 * errors downtrain to 1x.
 *
 * The work-around should be applied to all SRIO SerDes lanes/ports.
 * Workaround is to write to SRIO_PnCCSR[PWO] = 110
 *
 */

.pbi
// PBI commands to explicitely disabling 2x mode
// and enabling 4x mode by writing PWO to 110
write 0x0c015c, 0xD6620001
write 0x0c017c, 0xD6620001
.end