Implement M6D read-only FAT32 filesystem

CHANGELOG.md

@@ -1,5 +1,25 @@
 # Changelog
 
+## M6D Read-Only FAT32 candidate — 2026-07-30
+
+- Added an allocation-free FAT32 backend over the architecture-independent
+  block-device contract.
+- Validated BPB geometry, FAT capacity, device bounds, FSInfo signatures, and
+  the complete backup boot sector before mounting.
+- Added bounded cluster traversal with free, reserved, bad, out-of-range,
+  premature-end, overlong, and cyclic-chain rejection.
+- Added FAT 8.3 and checksum-validated, bounded UTF-16 long-name decoding.
+- Added root, nested-directory, offset, and multi-cluster persistent reads.
+- Mounted FAT32 read-only at `/disk` behind the M6C VFS.
+- Added streaming shell `cat`, path-aware `ls`, and `fat32` diagnostics.
+- Added a deterministic 64 MiB FAT32 QEMU fixture preserving the M6B device
+  identity sector.
+- Advanced the capability registry to version 7 and added exact M6D smoke
+  evidence while preserving M5 through M6C regression gates.
+
+M6D does not expose persistent files to Ring 3, load executables from FAT32,
+write persistent media, discover partitions, or support physical installation.
+
 ## M6C Bounded Cache and VFS candidate — 2026-07-27
 
 - Adopted Soma OS as the temporary user-facing working identity while retaining

PROJECT.md

@@ -6,9 +6,9 @@
 - Architecture: x86-64
 - Firmware: UEFI 2.x
 - Primary language: Rust 2024
-- Accepted checkpoint: M6B Virtio Block Transport
-- Immutable release: `v0.0.10-m6b`
-- Current development checkpoint: M6C bounded cache and VFS
+- Accepted checkpoint: M6C Bounded Cache and VFS
+- Immutable release: `v0.0.11-m6c`
+- Current development checkpoint: M6D read-only FAT32
 - Deployment policy: QEMU only until physical-install safety gates pass
 
 ## Mission
@@ -21,12 +21,11 @@ Development is grouped into major milestone batches. Small formatting or CI corr
 
 ## Current objective
 
-Add an allocation-free, fixed-capacity read-through cache over the accepted
-virtio block transport. Establish bounded inode, superblock, mount, canonical
-path, directory, and generation-protected user file-handle contracts. Adapt
-RAMFS behind that VFS boundary without enabling persistent writes.
+Validate and mount a deterministic FAT32 volume over the accepted cache and
+virtio block stack. Expose bounded persistent directory and file reads through
+the VFS and shell while preserving an enforceable zero-dirty-data boundary.
 
 ## Next major objective
 
-Validate and mount a dedicated FAT32 image read-only, then expose bounded
-persistent directory listing and file reads through the accepted VFS.
+Add process-facing persistent file syscalls and executable reads without
+weakening path, handle, address-space, or read-only storage isolation.

README.md

@@ -9,9 +9,9 @@ milestones before any physical-disk work.
 [![License: MIT](https://img.shields.io/badge/License-MIT-yellow.svg)](https://opensource.org/licenses/MIT)
 [![Ask DeepWiki](https://deepwiki.com/badge.svg)](https://deepwiki.com/chavalasantosh/OperatingSystem)
 
-## Current checkpoint: M6C Bounded Cache and VFS
+## Current checkpoint: M6D Read-Only FAT32
 
-The accepted baseline entering this phase is `v0.0.10-m6b`. M0 through FH2
+The accepted baseline entering this phase is M6C. M0 through FH2
 proved UEFI ownership transfer, protected kernel
 execution, interrupts, Ring 3 entry, `SYSCALL`/`SYSRET`, ELF64 loading,
 recoverable user faults, physical ownership, and a fresh Soma OS page-table
@@ -65,10 +65,23 @@ M6C builds the filesystem boundary without enabling persistent writes:
 - RAMFS accessed through the same VFS interface reserved for FAT32;
 - `cache` and `mounts` shell diagnostics plus exact smoke evidence.
 
+M6D activates persistent reads through that boundary:
+
+- a deterministic 64 MiB FAT32 image attached as the dedicated virtio device;
+- validated BPB geometry, FAT capacity, FSInfo, backup boot sector, and device
+  bounds;
+- bounded FAT-chain traversal with malformed-cluster and cycle rejection;
+- short-name and checksum-validated UTF-16 long-filename decoding;
+- root, nested-directory, offset, and multi-cluster file reads;
+- a second VFS mount at `/disk` with read-only enforcement;
+- cache-backed persistent reads with zero dirty entries;
+- `fat32`, path-aware `ls`, and persistent streaming `cat` shell diagnostics;
+- exact QEMU evidence preserving every M5 through M6C regression gate.
+
 ## Shell commands
 
 ```text
-help version userspace uptime memory irq tasks pci block cache mounts ls cat write echo clear
+help version userspace uptime memory irq tasks pci block cache fat32 mounts ls cat write echo clear
 ```
 
 ## Build and verify
@@ -98,14 +111,15 @@ docs/               Requirements, architecture, ADRs, testing, security, process
 
 ## Current boundary
 
-M6C and FH3 remain single-core and PIT-driven. Block completion is synchronous
+M6D and FH3 remain single-core and PIT-driven. Block completion is synchronous
 and polling, one request is outstanding at a time, and only the explicitly
 identified disposable QEMU disk is used. The cache cannot issue writes and
-cannot contain dirty entries. RAMFS remains the only writable filesystem. The
-combined EFI-stub kernel still retains a bounded identity mapping while a
-separate high-half kernel image is designed. Read-only FAT32, persistent
-writes, physical-disk installation, graphics, SMP, and local APIC timers remain
-later gates.
+cannot contain dirty entries. RAMFS is the writable root and FAT32 is mounted
+read-only at `/disk`. The combined EFI-stub kernel still retains a bounded
+identity mapping while a separate high-half kernel image is designed.
+Process-facing persistent file syscalls, executable loading from FAT32,
+persistent writes, physical-disk installation, graphics, SMP, and local APIC
+timers remain later gates.
 
 ## Safety
 

SOURCE_MANIFEST.sha256

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 3dcc935b116e777b03821a59082b05a44e9a636ac39dcecf3915368ffaeda389  user/programs/src/init.S
-613a7ccaa0b692edca8b0f823d60874df86459fdfe6310ef863bc310be1a9deb  verification/uefi-probe/main.c
 5ff24f8132b0ee21d0e54b7d1c91aefef56e3a49c55c25a3437e0f0a8b6b8d5f  verification/uefi-probe/README.md
+613a7ccaa0b692edca8b0f823d60874df86459fdfe6310ef863bc310be1a9deb  verification/uefi-probe/main.c

boot/uefi/Cargo.toml

@@ -1,6 +1,6 @@
 [package]
 name = "sanju-boot"
-version = "0.0.11"
+version = "0.0.12"
 edition.workspace = true
 rust-version.workspace = true
 publish.workspace = true