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The hush shell dynamically allocates (and re-allocates) memory for the
argument strings in the "char *argv[]" argument vector passed to
commands. Any code that modifies these pointers will cause serious
corruption of the malloc data structures and crash U-Boot, so make
sure the compiler can check that no such modifications are being done
by changing the code into "char * const argv[]".
This modification is the result of debugging a strange crash caused
after adding a new command, which used the following argument
processing code which has been working perfectly fine in all Unix
systems since version 6 - but not so in U-Boot:
int main (int argc, char **argv)
{
while (--argc > 0 && **++argv == '-') {
/* ====> */ while (*++*argv) {
switch (**argv) {
case 'd':
debug++;
break;
...
default:
usage ();
}
}
}
...
}
The line marked "====>" will corrupt the malloc data structures and
usually cause U-Boot to crash when the next command gets executed by
the shell. With the modification, the compiler will prevent this with
an
error: increment of read-only location '*argv'
N.B.: The code above can be trivially rewritten like this:
while (--argc > 0 && **++argv == '-') {
char *arg = *argv;
while (*++arg) {
switch (*arg) {
...
Signed-off-by: Wolfgang Denk <wd@denx.de>
Acked-by: Mike Frysinger <vapier@gentoo.org>
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This patch removes the \n after the help message for mmcinfo.
This resulted in an empty line being displayed after the mmcinfo line
when the help command was given.
Signed-off-by: Frans Meulenbroeks <fransmeulenbroeks@gmail.com>
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The curr_device variable isn't used outside of cmd_mmc, so mark it static
to avoid conflicts with other pieces of code (like sata which also exports
a curr_device). Otherwise we end up with stuff like:
common/libcommon.a(cmd_sata.o):(.data.curr_device+0x0):
multiple definition of `curr_device'
common/libcommon.a(cmd_mmc.o):(.data.curr_device+0x0): first defined here
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Many of the help messages were not really helpful; for example, many
commands that take no arguments would not print a correct synopsis
line, but "No additional help available." which is not exactly wrong,
but not helpful either.
Commit ``Make "usage" messages more helpful.'' changed this
partially. But it also became clear that lots of "Usage" and "Help"
messages (fields "usage" and "help" in struct cmd_tbl_s respective)
were actually redundant.
This patch cleans this up - for example:
Before:
=> help dtt
dtt - Digital Thermometer and Thermostat
Usage:
dtt - Read temperature from digital thermometer and thermostat.
After:
=> help dtt
dtt - Read temperature from Digital Thermometer and Thermostat
Usage:
dtt
Signed-off-by: Wolfgang Denk <wd@denx.de>
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find_mmc_device returns NULL if an invalid device number is specified.
Check for this to avoid dereferencing NULL pointers.
Signed-off-by: Rabin Vincent <rabin@rab.in>
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Remove some repeated words and superfluous newlines in the mmc command
help entries.
Signed-off-by: Rabin Vincent <rabin@rab.in>
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This patch improves device command for selecting mmc device
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
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Fix up a few dangling commands like in "Command usage cleanup" commit.
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
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Don't use code of new MMC framework in cmd_mmc if CONFIG_GENERIC_MMC
isn't enabled.
Signed-off-by: Dirk Behme <dirk.behme@googlemail.com>
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Signed-off-by: Wolfgang Denk <wd@denx.de>
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Here's a new framework (based roughly off the linux one) for managing
MMC controllers. It handles all of the standard SD/MMC transactions,
leaving the host drivers to implement only what is necessary to
deal with their specific hardware.
This also hooks the infrastructure into the PowerPC board code
(similar to how the ethernet infrastructure now hooks in)
Some of this code was contributed by Dave Liu <daveliu@freescale.com>
Signed-off-by: Andy Fleming <afleming@freescale.com>
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This is to get it out of the way of incoming MMC framework
Signed-off-by: Andy Fleming <afleming@freescale.com>
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Remove command name from all command "usage" fields and update
common/command.c to display "name - usage" instead of
just "usage". Also remove newlines from command usage fields.
Signed-off-by: Peter Tyser <ptyser@xes-inc.com>
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Modify common/Makefile to conditionally compile the cmd_*.c files based
on the board config.
Signed-off-by: Grant Likely <grant.likely@secretlab.ca>
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Fixed some broken instances of "#ifdef CMD_CFG_IDE" too.
Those always evaluated TRUE, and thus were always compiled
even when IDE really wasn't defined/wanted.
Signed-off-by: Jon Loeliger <jdl@freescale.com>
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Signed-off-by: Jon Loeliger <jdl@freescale.com>
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This is a compatibility step that allows both the older form
and the new form to co-exist for a while until the older can
be removed entirely.
All transformations are of the form:
Before:
#if (CONFIG_COMMANDS & CFG_CMD_AUTOSCRIPT)
After:
#if (CONFIG_COMMANDS & CFG_CMD_AUTOSCRIPT) || defined(CONFIG_CMD_AUTOSCRIPT)
Signed-off-by: Jon Loeliger <jdl@freescale.com>
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get rid of MK_CMD_ENTRY macro; update doc/README.command
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(autoscript, bmp, bsp, fat, mmc, nand, portio, ...)
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* Patches by Kyle Harris, 13 Mar 2003:
- Add FAT partition support
- Add command support for FAT
- Add command support for MMC
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- Add Intel PXA support for video
- Add Intel PXA support for MMC
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- Enable MMC and FAT for lubbock board
- Other misc changes for lubbock board
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