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6d8962e814
Before this commit, weak symbols were not overridden by non-weak symbols found in archive libraries when linking with recent versions of binutils. As stated in the System V ABI, "the link editor does not extract archive members to resolve undefined weak symbols". This commit changes all Makefiles to use partial linking (ld -r) instead of creating library archives, which forces all symbols to participate in linking, allowing non-weak symbols to override weak symbols as intended. This approach is also used by Linux, from which the gmake function cmd_link_o_target (defined in config.mk and used in all Makefiles) is inspired. The name of each former library archive is preserved except for extensions which change from ".a" to ".o". This commit updates references accordingly where needed, in particular in some linker scripts. This commit reveals board configurations that exclude some features but include source files that depend these disabled features in the build, resulting in undefined symbols. Known such cases include: - disabling CMD_NET but not CMD_NFS; - enabling CONFIG_OF_LIBFDT but not CONFIG_QE. Signed-off-by: Sebastien Carlier <sebastien.carlier@gmail.com> |
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|---|---|---|
| .. | ||
| auto_update.c | ||
| cmd_trab.c | ||
| config.mk | ||
| flash.c | ||
| lowlevel_init.S | ||
| Makefile | ||
| memory.c | ||
| Pt1000_temp_data.h | ||
| README.kbd | ||
| rs485.c | ||
| rs485.h | ||
| trab.c | ||
| trab_fkt.c | ||
| tsc2000.c | ||
| tsc2000.h | ||
| u-boot.lds | ||
| vfd.c | ||
The TRAB keyboard implementation is similar to that for LWMON and R360MPI boards. The only difference concerns key naming. There are 4 keys on TRAB: 1, 2, 3, 4. 1) The "kbd" command provides information about the current state of the keys. For example, TRAB # kbd Keys: 1 0 1 0 means that keys 1 and 3 are pressed. The keyboard status is also stored in the "keybd" environment variable. In this example we get keybd=1010 2) The "preboot" variable is set according to current environment settings and keys pressed. This is an example: TRAB # setenv magic_keys XY TRAB # setenv key_magicX 12 TRAB # setenv key_cmdX echo ## Keys 1 + 2 pressed ##\;echo TRAB # setenv key_magicY 13 TRAB # setenv key_cmdY echo ## Keys 1 + 3 pressed ##\;echo Here "magic_keys=XY" means that the "key_magicX" and "key_magicY" variables will be checked for a match. Each variable "key_magic*" defines a set of keys. In the our example, if keys 1 and 3 are pressed during reset, then "key_magicY" matches, so the "preboot" variable will be set to the contents of "key_cmdY": preboot=echo ## Keys 1 + 3 pressed ##;echo 3) The TRAB board has optional modem support. When a certain key combination is pressed on the keyboard at power-on, the firmware performs the necessary initialization of the modem and allows for dial-in. The key combination is specified in the "include/configs/trab.h" file. For example: #define CONFIG_MODEM_KEY_MAGIC "23" means that modem will be initialized if and only if both keys 2, 3 are pressed. Note that the format of this string is similar to the format of "key_magic*" environment variables described above.