[U-Boot] policy regarding unused code

[Lukasz Majewski <lukma@denx.de>]

On Tue, 11 Dec 2018 16:46:01 +0100
Jean-Jacques Hiblot <jjhiblot@ti.com> wrote:

> On 11/12/2018 16:25, Jean-Jacques Hiblot wrote:
> > Hi Tom,
> >
> > Is there such a policy described somewhere ?
> >
> > There are quite a pieces of code that are not used/compiled because
> > no config enables it.
> >
> > A random pick among many others:
> >
> > - CONFIG_FPGA_LATTICE
> >
> > - CONFIG_MESON_SPIFC
> >
> > - CONFIG_POWER_BATTERY_TRATS2
> >
> > - CONFIG_UPDATE_TFTP
> >
> >  
> Here a more complete list of suspects (there may be options that do
> not even exist)
> 
> Suspect means that the variable is probably referenced in a Makefile
> but not in configs/ nor in include/configs
> 
> This is not a small list and a lot of them we probably want to keep.
> 
> ['CONFIG_MX8M', 'CONFIG_POWER_PMIC_MAX77693',
		   ^^^^ Samsung PMIC [1]

> 'CONFIG_TPM2_TIS_SANDBOX', 'CONFIG_TPM_ST33ZP24_SPI',
> 'CONFIG_USB_SL811HS', 'CONFIG_RAM_SUPPORT', 'CONFIG_BCM2835_WDT',
> 'CONFIG_ENV_IS_IN_SATA', 'CONFIG_IO64', 'CONFIG_NAND_SUPPORT',
> 'CONFIG_NOR_SUPPORT', 'CONFIG_RISCV_ISA_A', 'CONFIG_I2C_MUX_GPIO',
						^^^ Samsung - trats
						IIRC [1]
> 'CONFIG_POWER_FG_MAX17042', 'CONFIG_DNET',
    ^^^^^ [1]

> 'CONFIG_CMD_SH_ZIMAGEBOOT', 'CONFIG_USE_DEFAULT_ENV_FILE',
> 'CONFIG_CMD_IOTRACE', 'CONFIG_ALI152X', 'CONFIG_M5271',
> 'CONFIG_CPU_MPC83XX', 'CONFIG_NXP_TDA19988', 'CONFIG_IMX',
> 'CONFIG_ADI_GPIO2', 'CONFIG_BUILD_ENVCRC', 'CONFIG_FTMAC110',
> 'CONFIG_CMD_CONITRACE', 'CONFIG_USB_DAVINCI', 'CONFIG_TARGET_XTFPGA',
> 'CONFIG_DLVISION_10G', 'CONFIG_CMD_KGDB', 'CONFIG_USB_SDP_SUPPORT',
> 'CONFIG_MESON_GX_VPU_POWER_DOMAIN', 'CONFIG_FSL_DMA',
> 'CONFIG_IHS_VIDEO_OUT', 'CONFIG_CMD_ZFS', 'CONFIG_P2020DS',
> 'CONFIG_RTC_DS1388', 'CONFIG_POWER_MUIC_MAX8997',
			 ^^^ - [1]

> 'CONFIG_TPM2_TIS_SPI', 'CONFIG_TEST_FDTDEC',
> 'CONFIG_AIS_CONFIG_FILE', 'CONFIG_GDSYS_SOC', 'CONFIG_CMD_DTIMG',
> 'CONFIG_DFU_SUPPORT', 'CONFIG_SYS_JFFS2_SORT_FRAGMENTS',
   ^^^^ - This is used widely2

> 'CONFIG_ATF', 'CONFIG_BLOBLIST', 'CONFIG_NAND_SPEAR',
> 'CONFIG_MPC8XXX_GPIO', 'CONFIG_ULP_WATCHDOG', 'CONFIG_RTC_MK48T59',
> 'CONFIG_CMD_FITUPD', 'CONFIG_MODVERSIONS', 'CONFIG_CPU_SH3',
> 'CONFIG_CMD_BEDBUG', 'CONFIG_AT91_USB_CLK', 'CONFIG_CMD_UNIVERSE',
> 'CONFIG_DEBUG_UART_UNIPHIER', 'CONFIG_CMD_DISPLAY',
> 'CONFIG_ETH_SANDBOX_RAW', 'CONFIG_SANDBOX', 'CONFIG_CPU_SH2',
> 'CONFIG_SATA_SUPPORT', 'CONFIG_IOCON', 'CONFIG_MESON_SPIFC',
> 'CONFIG_NS8382X', 'CONFIG_SOC_DM355', 'CONFIG_BOARD_GAZERBEAM',
> 'CONFIG_CMD_AVB', 'CONFIG_MW_EEPROM', 'CONFIG_SHA1_CHECK_UB_IMG',
> 'CONFIG_IHS_FPGA', 'CONFIG_USE_PLUGIN', 'CONFIG_VIDEO_SIMPLE',
> 'CONFIG_CLK_VEXPRESS_OSC', 'CONFIG_MIPS_TUNE_14KC',
> 'CONFIG_MPC83XX_SDRAM', 'CONFIG_XIP_SUPPORT',
> 'CONFIG_MIPS_TUNE_34KC', 'CONFIG_ALTERA_UART', 'CONFIG_LOAD_FIT',
> 'CONFIG_RTC_DS1339', 'CONFIG_ENV_SUPPORT', 'CONFIG_DEFAULT_ENV_FILE',
> 'CONFIG_TPM_ST33ZP24_I2C', 'CONFIG_PCH_SUPPORT',
> 'CONFIG_UBOOT_PAD_TO', 'CONFIG_LYNXKDI', 'CONFIG_CMD_SMC',
> 'CONFIG_BOOTCOUNT_AT91', 'CONFIG_OF_PLATDATA',
> 'CONFIG_CONSOLE_TRUETYPE_NIMBUS', 'CONFIG_S6E8AX0',
> 'CONFIG_FPGA_ACEX1K', 'CONFIG_MVEBU_EFUSE',
> 'CONFIG_CONSOLE_TRUETYPE_RUFSCRIPT',
> 'CONFIG_XILINX_MICROBLAZE0_HW_VER',
> 'CONFIG_CONSOLE_TRUETYPE_ANKACODER', 'CONFIG_RTC_M41T60',
> 'CONFIG_CMD_ZIP', 'CONFIG_USB_SUPPORT', 'CONFIG_SPI_FLASH_SUPPORT',
> 'CONFIG_FLASH_PIC32', 'CONFIG_SAVEENV', 'CONFIG_FPGA_STRATIX_II',
> 'CONFIG_TEE', 'CONFIG_PIC32_SPI', 'CONFIG_FAT_SUPPORT',
> 'CONFIG_SERIAL_SUPPORT', 'CONFIG_RTC_DS174x', 'CONFIG_RTC_RS5C372A',
> 'CONFIG_DM_DEBUG', 'CONFIG_DISPLAY_ROCKCHIP_LVDS',
> 'CONFIG_CMD_ZYNQ_RSA', 'CONFIG_VEXPRESS_CONFIG',
> 'CONFIG_SPI_SUPPORT', 'CONFIG_POWER_BATTERY_TRATS2', 'CONFIG_CS8900',
> 'CONFIG_DRIVERS_MISC_SUPPORT', 'CONFIG_YMODEM_SUPPORT',
> 'CONFIG_MPC83XX_SERDES', 'CONFIG_NAND_KB9202', 'CONFIG_PL022_SPI',
> 'CONFIG_RTC_PCF2127', 'CONFIG_ARMV8_PSCI', 'CONFIG_KALLSYMS',
> 'CONFIG_LAN91C96', 'CONFIG_SHELL', 'CONFIG_SOC_DM646X',
> 'CONFIG_HASH_SUPPORT', 'CONFIG_ARMADA_39X', 'CONFIG_CMD_STRINGS',
> 'CONFIG_ARCH_RV32I', 'CONFIG_RTC_M48T35A',
> 'CONFIG_DATAFLASH_MMC_SELECT', 'CONFIG_UPDATE_TFTP',
> 'CONFIG_CPU_SA1100', 'CONFIG_NAND_PLAT', 'CONFIG_GPIO_SUPPORT',
> 'CONFIG_RTC_DS1306', 'CONFIG_LOG_TEST', 'CONFIG_IHS_AXI',
> 'CONFIG_XWAY_SWAP_BYTES', 'CONFIG_CPU_SH4', 'CONFIG_RTC_MAX6900',
> 'CONFIG_TEGRA210_QSPI', 'CONFIG_SYS_I2C_VERSATILE',
> 'CONFIG_PCI_SUPPORT', 'CONFIG_SPI_LOAD', 'CONFIG_NAND_FSL_UPM',
> 'CONFIG_RTC_DS1556', 'CONFIG_DRIVER_AX88180', 'CONFIG_E1000_SPI',
> 'CONFIG_ONENAND_U_BOOT', 'CONFIG_CMD_TERMINAL', 'CONFIG_MODULES',
   ^^^^ - onenand is used by one Samsung board - Goni. IIRC one other
   board also uses it - good candidate for removal....

> 'CONFIG_ONENAND_SUPPORT', 'CONFIG_SH_SDHI',
> 'CONFIG_CC_OPTIMIZE_LIBS_FOR_SPEED', 'CONFIG_BUILD',
> 'CONFIG_VIDEO_ARM_MALIDP', 'CONFIG_POWER_BATTERY_TRATS',
> 'CONFIG_DRIVER_SMC911X', 'CONFIG_UBI', 'CONFIG_MMC_SDHCI_SPEAR',
> 'CONFIG_USB_OHCI_DA8XX', 'CONFIG_UDP_FUNCTION_FASTBOOT',
> 'CONFIG_EXT_SUPPORT', 'CONFIG_USB_EHCI_FARADAY',
> 'CONFIG_TARGET_AXS103', 'CONFIG_PHY_MSCC', 'CONFIG_FTPCI100',
> 'CONFIG_PCIE_INTEL_FPGA', 'CONFIG_IO',
> 'CONFIG_SECURED_MODE_CSK_INDEX', 'CONFIG_SYSRESET_MCP83XX',
> 'CONFIG_BOOTROM_SUPPORT', 'CONFIG_POWER_MUIC_MAX77693',
			     ^^^^^ [1]

> 'CONFIG_MMC_SUPPORT', 'CONFIG_LOGICORE_DP_TX', 'CONFIG_GDSYS_IOEP',
> 'CONFIG_XILINX_MICROBLAZE0_USE_PCMP_INSTR', 'CONFIG_RMOBILE',
> 'CONFIG_CMD_AES', 'CONFIG_RTC_S3C24X0', 'CONFIG_NATSEMI',
> 'CONFIG_NS87308', 'CONFIG_CBMEM_CONSOLE', 'CONFIG_MARUBUN_PCCARD',
> 'CONFIG_XILINX_SPI', 'CONFIG_FS_LOADER', 'CONFIG_YAFFS2',
					   Do we have Yaffs2 port in
					   u-boot? :-)

> 'CONFIG_DM644X_GPIO', 'CONFIG_SOC_DM365', 'CONFIG_ARC_TIMER',
> 'CONFIG_POWER_MAX8998', 'CONFIG_CMD_FDC', 'CONFIG_RTC_RV3029',
   ^^^^^^ - [1]

> 'CONFIG_RTC_AT91SAM9_RTT', 'CONFIG_EXYNOS_PWM_BL',
> 'CONFIG_CLK_MPC83XX', 'CONFIG_RTC_DS1302', 'CONFIG_TPM_TIS_SANDBOX',
> 'CONFIG_MPC83XX_TIMER', 'CONFIG_ICS8N3QV01', 'CONFIG_ARCH_P1011',
> 'CONFIG_I2C_SUPPORT', 'CONFIG_GDSYS_RXAUI_CTRL',
> 'CONFIG_POWER_FG_MAX77693', 'CONFIG_PINCTRL_QCA953x',
  ^^^^^^ - [1]

> 'CONFIG_CMD_SHA1SUM', 'CONFIG_RTC_DAVINCI', 'CONFIG_NET_SUPPORT',
> 'CONFIG_FPGA_LATTICE', 'CONFIG_RTC_M41T94', 'CONFIG_MPC8XX_SPI',
> 'CONFIG_LPC32XX_HSUART', 'CONFIG_CMD_YAFFS2',
> 'CONFIG_W1_EEPROM_DS2502', 'CONFIG_VIDEO_MX3', 'CONFIG_UT_UNICODE',
> 'CONFIG_RTC_MX27', 'CONFIG_LIBAVB', 'CONFIG_RTC_DS164x',
> 'CONFIG_CMD_HVC', 'CONFIG_CPU_V7', 'CONFIG_FPGA_VIRTEX2',
> 'CONFIG_POWER_MAX8997', 'CONFIG_MVEBU_SPL_BOOT_DEVICE_UART',
  ^^^^^^ - [1]

> 'CONFIG_ETH_SANDBOX', 'CONFIG_DEBUG_LL', 'CONFIG_MCR3000',
> 'CONFIG_USB_EHCI_RMOBILE', 'CONFIG_DB8500_GPIO',
> 'CONFIG_SECURED_MODE_IMAGE', 'CONFIG_CMD_TRACE', 'CONFIG_AVB_VERIFY',
> 'CONFIG_NULLDEV_SERIAL', 'CONFIG_CMD_INI', 'CONFIG_VIRTIO_SANDBOX',
> 'CONFIG_MACH_DAVINCI_DA830_EVM', 'CONFIG_USB_ETHER_LAN75XX',
> 'CONFIG_SUN4I_SPI', 'CONFIG_CMD_BINOP', 'CONFIG_RTC_SUPPORT',
> 'CONFIG_USB_DA8XX', 'CONFIG_SOC_DM644X', 'CONFIG_ALTERA_SPI',
> 'CONFIG_SYS_FPGA_COMMON', 'CONFIG_TOOLS_DEBUG',
> 'CONFIG_USB_GADGET_FOTG210', 'CONFIG_RTC_X1205',
> 'CONFIG_FPGA_SPARTAN2', 'CONFIG_CMD_MFSL', 'CONFIG_RISCV_ISA_C']

[1] - Those options were added for Samsung boards; trats, trats2, goni,
odroid U3/XU3. Mostly are related to old PMIC driver (non DM).

However, for Odroids there are uses who use it. For other Samsung
boards - I don't know they did not gain much traction as Tizen mobile
phones.

IMHO - good candidates for removal.

> 
> > JJ
> >
> >
> >
> >
> >
> > _______________________________________________
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Best regards,

Lukasz Majewski

--

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