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Add optional __boot partition and MWDMA2 kernel patch for IDE→SD adapters #575

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d2d48da
Add optional __boot partition and MWDMA2 kernel patch for IDE→SD adap…
sebekkx May 15, 2026
3d41e36
Address review feedback: always create 8MB __boot, move MWDMA2 patch …
sebekkx May 17, 2026
787a558
Add mounting and unmounting of __system partition
CosmicScale May 17, 2026
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95 changes: 95 additions & 0 deletions scripts/Extras.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -589,6 +589,62 @@ cat << "EOF"
EOF
}

# Patch vmlinux kernel to use MWDMA2 instead of UDMA4 for DMA
# Fixes IDE→SD/SATA adapters on SCPH-7000x that fail on UDMA writes
patch_vmlinux_mwdma2() {
local vmlinux="$1"
if [ ! -f "$vmlinux" ]; then
echo " [!] vmlinux not found at $vmlinux" | tee -a "${LOG_FILE}"
return 1
fi
echo " Patching kernel for MWDMA2 (SD card mode)..." | tee -a "${LOG_FILE}"
python3 -c "
import struct, sys, subprocess
with open('$vmlinux', 'rb+') as f:
data = f.read()
sym_addr = None
# Try nm first, then readelf
for cmd in (['nm', '$vmlinux'], ['readelf', '-s', '$vmlinux']):
try:
out = subprocess.check_output(cmd, stderr=subprocess.DEVNULL).decode()
for line in out.split('\\n'):
if 'ide_config_drive_speed' in line:
parts = line.split()
if parts:
try: sym_addr = int(parts[0], 16); break
except: pass
if sym_addr: break
except: pass
if sym_addr:
jal = (0x0C << 26) | ((sym_addr >> 2) & 0x3FFFFFF)
jal_bytes = struct.pack('<I', jal)
old_li = struct.pack('<I', 0x24050044)
pattern = jal_bytes + old_li
idx = data.find(pattern)
if idx >= 0:
data = bytearray(data)
data[idx + 4] = 0x22
f.seek(0); f.write(data); f.truncate()
print(f'Patched at file offset 0x{idx+4:x}')
sys.exit(0)
# Fallback: find JAL + li a1,0x44
old_li = struct.pack('<I', 0x24050044)
idx = data.find(old_li)
while idx >= 0:
if idx >= 4:
prev = struct.unpack_from('<I', data, idx - 4)[0]
if (prev >> 26) == 0x03:
data = bytearray(data)
data[idx] = 0x22
f.seek(0); f.write(data); f.truncate()
print(f'Patched at file offset 0x{idx:x}')
sys.exit(0)
idx = data.find(old_li, idx + 1)
print('Pattern not found')
sys.exit(1)
" 2>> "${LOG_FILE}" && echo " [OK] Kernel patched for MWDMA2" | tee -a "${LOG_FILE}" || echo " [!] Kernel patch failed - may already be patched" | tee -a "${LOG_FILE}"
}

# Function for Option 1 - Install PS2 Linux
option_one() {
echo "########################################################################################################" >> "${LOG_FILE}"
Expand Down Expand Up @@ -1407,6 +1463,40 @@ option_five() {
read -n 1 -s -r -p " Press any key to return to the menu..." </dev/tty
}

option_six() {
clear
echo "########################################################################################################" >> "${LOG_FILE}"
echo "MWDMA2 Kernel Patch:" >> "${LOG_FILE}"

echo
echo " This patches the PS2 Linux kernel to use MWDMA2 instead of UDMA4"
echo " for DMA transfers. Fixes write hangs on SCPH-7000x consoles"
echo " using IDE→SD or IDE→SATA adapters."
echo
echo " NOTE: This fixes the PSBBN boot hang, but game launching from"
echo " the PSBBN menu may still freeze on 'Wait while loading' screen."
echo " This is a separate issue under investigation (see PR #575)."
echo
read -p " Apply MWDMA2 kernel patch? [y/N]: " confirm
if [[ ! "$confirm" =~ ^[Yy]$ ]]; then
echo
echo " Patch cancelled."
sleep 2
return 0
fi

APA_PARTITIONS=("__system" )
mapper_probe && \
mount_pfs || return 1
sleep 2

patch_vmlinux_mwdma2 "${STORAGE_DIR}/__system/p2lboot/vmlinux"
clean_up || return 1

echo
read -n 1 -s -r -p " Press any key to return to the menu..." </dev/tty
}

EXTRAS_SPLASH() {
clear
cat << "EOF"
Expand Down Expand Up @@ -1436,6 +1526,8 @@ display_menu() {

5) Clear Art & Icon Cache

6) Apply MWDMA2 Kernel Patch

b) Back to Main Menu

EOF
Expand Down Expand Up @@ -1495,6 +1587,9 @@ while true; do
5)
option_five
;;
6)
option_six
;;
b|B)
break
;;
Expand Down
9 changes: 8 additions & 1 deletion scripts/PSBBN-Installer.sh
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Original file line number Diff line number Diff line change
Expand Up @@ -99,6 +99,8 @@ done

if [ "$MODE" = "install" ]; then
LOG_FILE="${TOOLKIT_PATH}/logs/PSBBN-installer.log"
# Always create a small __boot partition (harmless, usable for modchip DEV2)
BOOT_PARTITION=1
else
LOG_FILE="${TOOLKIT_PATH}/logs/update.log"
fi
Expand All @@ -111,7 +113,7 @@ version_le() { # returns 0 (true) if $1 < $2

if [ "$MODE" = "install" ]; then
LINUX_PARTITIONS=("__linux.1" "__linux.4" "__linux.5" "__linux.6" "__linux.7" "__linux.8" "__linux.9" )
PFS_PARTITIONS=("__contents" "__system" "__sysconf" "__common" )
PFS_PARTITIONS=("__contents" "__system" "__sysconf" "__common" "__boot" )
fi

error_msg() {
Expand Down Expand Up @@ -939,6 +941,7 @@ if [ "$MODE" = "install" ]; then

COMMANDS="device ${DEVICE}\n"
COMMANDS+="initialize yes\n"
COMMANDS+="mkpart __boot 8M PFS\n"
COMMANDS+="mkpart __linux.1 512M EXT2\n"
COMMANDS+="mkpart __linux.2 128M EXT2SWAP\n"
COMMANDS+="mkpart __linux.4 512M EXT2\n"
Expand Down Expand Up @@ -1227,6 +1230,8 @@ if [ "$OSD_UPDATE" != "no" ]; then
cp -f "${ASSETS_DIR}/osdmenu/"{hosdmenu.elf,version.txt} "${STORAGE_DIR}/__system/osdmenu/" 2>> "${LOG_FILE}" || error_msg "Failed to copy hosdmenu.elf."
fi

# __boot partition is created automatically; users copy their own bootloader if needed

# Check if OSDMBR.CNF exists
if [ ! -f "${STORAGE_DIR}/__sysconf/osdmenu/OSDMBR.CNF" ]; then
if sudo "${HDL_DUMP}" toc ${DEVICE} | grep -q "__linux.3"; then
Expand Down Expand Up @@ -1388,6 +1393,8 @@ if [ "$OS" = "PSBBN" ] && [ "$MODE" = "update" ]; then
sudo cp -f "${SYSCONF_XML}" "${STORAGE_DIR}/__linux.4/bn/script/utility/sysconf.xml" || error_msg "Failed to replace sysconf.xml."
fi

# MWDMA2 kernel patch is available in the Extras menu for IDE→SD adapter users

UNMOUNT_ALL

if [ "$OS" = "PSBBN" ] && [ "$MODE" = "update" ] && version_le "${psbbn_version:-0}" "4.0.0"; then
Expand Down