docs: update QEMU mode docs for =PATH syntax and uncompressed initramfs

README.md

@@ -38,7 +38,7 @@ ecr [OPTIONS] <DISTRO[:VERSION]> [-- COMMAND...]
 | `--no-cache` | Force a fresh download, bypassing the cache |
 | `-v, --verbose` | Print diagnostic output (URLs, layer info, extraction steps) |
 | `-a, --arch <ARCH>` | Target architecture (`amd64`, `arm64`, `armhf`, `riscv64`, …) |
-| `--kernel [PATH]` | Boot with QEMU system emulation. Downloads Alpine's `linux-virt` kernel if no path provided |
+| `--kernel[=PATH]` | Boot with QEMU system emulation. Downloads Alpine's `linux-virt` kernel if no `=PATH` given |
 | `-m, --memory <SIZE>` | Memory for QEMU VM (default: 2G, only with `--kernel`) |
 
 ## Examples
@@ -62,8 +62,8 @@ ecr --no-cache fedora
 # Boot with QEMU system emulation (auto-downloads default kernel)
 ecr --kernel alpine
 
-# Boot with your own kernel
-ecr --kernel /boot/vmlinuz ubuntu
+# Boot with your own kernel (note the `=` — a space would parse the path as the distro)
+ecr --kernel=/boot/vmlinuz ubuntu
 
 # Boot with custom memory
 ecr --kernel --memory 4G alpine
@@ -78,16 +78,18 @@ When `--kernel` is specified, ecr boots the rootfs in a full QEMU virtual machin
 ecr --kernel alpine
 
 # Use your own kernel
-ecr --kernel /boot/vmlinuz ubuntu
+ecr --kernel=/boot/vmlinuz ubuntu
 ```
 
 This mode:
-- Creates a gzipped CPIO initramfs from the rootfs
+- Creates an uncompressed CPIO initramfs from the rootfs (streamed to disk)
 - Boots QEMU with your kernel (or auto-downloads Alpine's `linux-virt` kernel)
 - Provides full VM isolation
 - Works for any architecture (no binfmt_misc needed)
 - Caches the default kernel in `~/.cache/ecr/`
 
+Host bind mounts (`--bind`, `--bind-rw`) are not applied in this mode.
+
 Requirements:
 - `qemu-system-<arch>` installed
 - For custom kernels: kernel must have serial console support