[HLD] SSD Wipe#2449
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Adds the high-level design document for the graceful SSD wipe feature: `config sed wipe-ssd` CLI, `SedMgmtBase.wipe_ssd()` + abstract `get_psid()`, and the `ssd_erase.sh` orchestrator that performs the ramdisk pivot, crypto erase (SED PSID revert), and NVMe block erase. Builds on the SED framework from sonic-net#2171 (change/reset SED password).
- §2 Scope: name the platform-specific API as get_psid() API for parity with the common API row. - §4.1 Warning: state that SED locking is disabled after wipe (Locking SP returned to unowned) in addition to the password reset. - §8 CLI: drop 'and reboot the switch' from the click.confirm prompt and from the interactive example - the operator does the reboot manually after the wipe completes. - §7.5: describe that check_sed_crypto_erase_prereqs delegates to the existing check_sed_ready for TPM/SED/locking checks instead of duplicating those checks.
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Summary
Adds the High-Level Design document for the SSD Wipe feature (
config sed wipe-ssd), which securely erases the switch boot SSD in three sequential stages:tmpfsso the physical SSD can be unmounted while the OS keeps running.sedutil-cli(fast, key-based wipe).nvme sanitize --sanact=0x02(slower, NAND-level overwrite).The feature extends the SED framework adding:
SedMgmtBase.wipe_ssd()+ abstractget_psid()ssd_erase.shorchestrator (ramdisk pivot + crypto erase + block erase)check_sed_crypto_erase_prereqshelper in the sharedsed_pw_utils.shrsyncadded to the image (needed by the ramdisk pivot)