still going through common/board_r.c, and ran across the above CONFIG variable, but it seems to have very little use these days. as you can see from a recursive grep:
$ grep -r SYS_FLASH_CHECKSUM *
it shows up in board_r.c:
common/board_r.c:#ifdef CONFIG_SYS_FLASH_CHECKSUM common/board_r.c:#endif /* CONFIG_SYS_FLASH_CHECKSUM */
then some under include/configs wherein only a small number of config header files #define it (all the rest #undef it):
include/configs/P1010RDB.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/M5249EVB.h:# define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/MPC8315ERDB.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/socrates.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/yucca.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/mpc5121ads.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8323ERDB.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/M52277EVB.h:# define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/MPC8544DS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/bamboo.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8536DS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/vme8349.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/ac14xx.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8641HPCN.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/katmai.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/M54418TWR.h:#define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/MPC837XEMDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/p1_twr.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/p1_p2_rdb_pc.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC832XEMDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/UCP1020.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8610HPCD.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8548CDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/M5282EVB.h:# define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/M54455EVB.h:# define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/redwood.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC837XERDB.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8568MDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8540ADS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/sbc8548.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8349EMDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/M54451EVB.h:# define CONFIG_SYS_FLASH_CHECKSUM <-- include/configs/MPC8541CDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/TQM834x.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/sbc8641d.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8572DS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/BSC9132QDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8569MDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/sbc8349.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/mecp5123.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8560ADS.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/aria.h:#undef CONFIG_SYS_FLASH_CHECKSUM include/configs/MPC8555CDS.h:#undef CONFIG_SYS_FLASH_CHECKSUM scripts/config_whitelist.txt:CONFIG_SYS_FLASH_CHECKSUM
and in:
scripts/config_whitelist.txt:CONFIG_SYS_FLASH_CHECKSUM
and that's it. the code in board_r.c is:
#ifdef CONFIG_SYS_FLASH_CHECKSUM /* * Compute and print flash CRC if flashchecksum is set to 'y' * * NOTE: Maybe we should add some WATCHDOG_RESET()? XXX */ if (getenv_yesno("flashchecksum") == 1) { printf(" CRC: %08X", crc32(0, (const unsigned char *) CONFIG_SYS_FLASH_BASE, flash_size)); } #endif /* CONFIG_SYS_FLASH_CHECKSUM */
wherein, even if that variable is set, a further test is made of the environment variable "flashchecksum."
is there still value to this CONFIG variable given that only a half-dozen boards define it? am i overlooking something obvious?
rday