Msa 1500 firmware updating guide
For information on determining whether you need to update MSA controller firmware, refer to the following sections in the document, HP Storage Works Modular Smart Array 1500 cs - Installation Procedures : After updating MSA controller firmware, be sure to check the status of the MSA for unexpected issues.Verify the status of the connections, defined profile types, redundancy settings, and storage configuration.
These operating systems use the MSA-CLI to configure the storage and obtain the HBA drivers and multipathing tools from a different source, such as through operating system updates or the HP website.
In the software and downloads section, you have the option of choosing a bunch of different O/Ses, including RHEL/SLES.
If you look at those you will see that they offer ISO downloads and downloads of the RPMs I mentioned above, but no raw firmware images you can use via serial.
From the Tru64 page, download the msa1500 firmware.
It says it's two parts, the other part is an msa20 firmware image.