pygoscelis: Try out zstd for kernel and initramfs

This not a panic reaction to the xz situation, but certainly an
experiment initiated by that. Let’s have a look at compression speed,
decompression (startup) speed and compression size.

Several changes to configs and packages must be done:
- enable kernel support for zstd compression for itself
- enable kernel support for zstd compression for the initramfs
- adopt firmware names in CONFIG_EXTRA_FIRMWARE
- let the initramfs be compressed with zstd
- compress firmware files with zstd (before re-building the kernel)

For some details see gitea issue #2.

pygoscelis-config

@@ -42,10 +42,10 @@ CONFIG_HAVE_KERNEL_ZSTD=y
 # CONFIG_KERNEL_GZIP is not set
 # CONFIG_KERNEL_BZIP2 is not set
 # CONFIG_KERNEL_LZMA is not set
-CONFIG_KERNEL_XZ=y
+# CONFIG_KERNEL_XZ is not set
 # CONFIG_KERNEL_LZO is not set
 # CONFIG_KERNEL_LZ4 is not set
-# CONFIG_KERNEL_ZSTD is not set
+CONFIG_KERNEL_ZSTD=y
 CONFIG_DEFAULT_INIT="/bin/init"
 CONFIG_DEFAULT_HOSTNAME="pygoscelis"
 CONFIG_SYSVIPC=y
@@ -233,10 +233,10 @@ CONFIG_INITRAMFS_SOURCE=""
 # CONFIG_RD_GZIP is not set
 # CONFIG_RD_BZIP2 is not set
 # CONFIG_RD_LZMA is not set
-CONFIG_RD_XZ=y
+# CONFIG_RD_XZ is not set
 # CONFIG_RD_LZO is not set
 # CONFIG_RD_LZ4 is not set
-# CONFIG_RD_ZSTD is not set
+CONFIG_RD_ZSTD=y
 # CONFIG_BOOT_CONFIG is not set
 CONFIG_INITRAMFS_PRESERVE_MTIME=y
 CONFIG_CC_OPTIMIZE_FOR_PERFORMANCE=y
@@ -1773,13 +1773,12 @@ CONFIG_PREVENT_FIRMWARE_BUILD=y
 # Firmware loader
 #
 CONFIG_FW_LOADER=y
-CONFIG_FW_LOADER_PAGED_BUF=y
+CONFIG_EXTRA_FIRMWARE="amdgpu/renoir_asd.bin.zst amdgpu/renoir_ce.bin.zst amdgpu/renoir_dmcub.bin.zst amdgpu/renoir_gpu_info.bin.zst amdgpu/renoir_me.bin.zst amdgpu/renoir_mec2.bin.zst amdgpu/renoir_mec.bin.zst amdgpu/renoir_pfp.bin.zst amdgpu/renoir_rlc.bin.zst amdgpu/renoir_sdma.bin.zst amdgpu/renoir_ta.bin.zst amdgpu/renoir_vcn.bin.zst regulatory.db regulatory.db.p7s"
-CONFIG_EXTRA_FIRMWARE="amdgpu/renoir_asd.bin.xz amdgpu/renoir_ce.bin.xz amdgpu/renoir_dmcub.bin.xz amdgpu/renoir_gpu_info.bin.xz amdgpu/renoir_me.bin.xz amdgpu/renoir_mec2.bin.xz amdgpu/renoir_mec.bin.xz amdgpu/renoir_pfp.bin.xz amdgpu/renoir_rlc.bin.xz amdgpu/renoir_sdma.bin.xz amdgpu/renoir_ta.bin.xz amdgpu/renoir_vcn.bin.xz regulatory.db regulatory.db.p7s"
 CONFIG_EXTRA_FIRMWARE_DIR="/lib/firmware"
 # CONFIG_FW_LOADER_USER_HELPER is not set
 CONFIG_FW_LOADER_COMPRESS=y
-CONFIG_FW_LOADER_COMPRESS_XZ=y
+# CONFIG_FW_LOADER_COMPRESS_XZ is not set
-# CONFIG_FW_LOADER_COMPRESS_ZSTD is not set
+CONFIG_FW_LOADER_COMPRESS_ZSTD=y
 CONFIG_FW_CACHE=y
 # CONFIG_FW_UPLOAD is not set
 # end of Firmware loader
@@ -6747,7 +6746,7 @@ CONFIG_XZ_DEC_X86=y
 # CONFIG_XZ_DEC_MICROLZMA is not set
 CONFIG_XZ_DEC_BCJ=y
 # CONFIG_XZ_DEC_TEST is not set
-CONFIG_DECOMPRESS_XZ=y
+CONFIG_DECOMPRESS_ZSTD=y
 CONFIG_GENERIC_ALLOCATOR=y
 CONFIG_REED_SOLOMON=y
 CONFIG_REED_SOLOMON_ENC8=y