[RFC PATCH v4 28/28] board: keymile: common: Use environment to store IVM_* variables.

[Holger Brunck]

Hi Francis,

> On Fri, Jun 17, 2022 at 12:31:58AM +0200, Francis Laniel wrote:
> 
> > These boards used set_local_var() to store some variables as local shell.
> > They then used get_local_var() to retrieve the variables values.
> >
> > Instead of using local shell variables, they should use environment
> > ones (like a majority of board).
> > So, this patch converts using local variables to environment ones.
> >

why do we need to change that? It is intended that we use this hush variable
infrastructure from u-boot (common/hush.c) for our IVM data and not the
standard env. We read the IVM at boot time and store these values in
RAM. It is not intended to store them permanently in the flash or wherever
the environment is saved. Especially in our case we have some boards where
the environment is in a i2c EEPROM and we don't want to write down to
the EEPROM each time when the board is starting.

> > Signed-off-by: Francis Laniel <francis.laniel at amarulasolutions.com>
> > ---
> >  board/keymile/common/common.c | 8 ++++----
> >  board/keymile/common/ivm.c    | 9 +--------
> >  2 files changed, 5 insertions(+), 12 deletions(-)
> >
> > diff --git a/board/keymile/common/common.c
> > b/board/keymile/common/common.c index 3999f48719..72939af36e 100644
> > --- a/board/keymile/common/common.c
> > +++ b/board/keymile/common/common.c
> > @@ -219,7 +219,7 @@ static int do_setboardid(struct cmd_tbl *cmdtp, int
> flag, int argc,
> >  	unsigned char buf[32];
> >  	char *p;
> >
> > -	p = get_local_var("IVM_BoardId");
> > +	p = env_get("IVM_BoardId");
> >  	if (!p) {
> >  		printf("can't get the IVM_Boardid\n");
> >  		return 1;
> > @@ -228,7 +228,7 @@ static int do_setboardid(struct cmd_tbl *cmdtp, int
> flag, int argc,
> >  	env_set("boardid", (char *)buf);
> >  	printf("set boardid=%s\n", buf);
> >
> > -	p = get_local_var("IVM_HWKey");
> > +	p = env_get("IVM_HWKey");
> >  	if (!p) {
> >  		printf("can't get the IVM_HWKey\n");
> >  		return 1;
> > @@ -272,14 +272,14 @@ static int do_checkboardidhwk(struct cmd_tbl
> *cmdtp, int flag, int argc,
> >  	 * first read out the real inventory values, these values are
> >  	 * already stored in the local hush variables
> >  	 */
> > -	p = get_local_var("IVM_BoardId");
> > +	p = env_get("IVM_BoardId");
> >  	if (!p) {
> >  		printf("can't get the IVM_Boardid\n");
> >  		return 1;
> >  	}
> >  	rc = strict_strtoul(p, 16, &ivmbid);
> >
> > -	p = get_local_var("IVM_HWKey");
> > +	p = env_get("IVM_HWKey");
> >  	if (!p) {
> >  		printf("can't get the IVM_HWKey\n");
> >  		return 1;
> > diff --git a/board/keymile/common/ivm.c b/board/keymile/common/ivm.c
> > index 67db0c50f4..e266d7ce81 100644
> > --- a/board/keymile/common/ivm.c
> > +++ b/board/keymile/common/ivm.c
> > @@ -44,14 +44,7 @@ static int ivm_calc_crc(unsigned char *buf, int
> > len)
> >
> >  static int ivm_set_value(char *name, char *value)  {
> > -	char tempbuf[256];
> > -
> > -	if (value) {
> > -		sprintf(tempbuf, "%s=%s", name, value);
> > -		return set_local_var(tempbuf, 0);
> > -	}
> > -	unset_local_var(name);
> > -	return 0;
> > +	return env_set(name, value);

this means we are now writing always down to the permanent
environment or? And this I would really like to avoid in our case.

Best regards
Holger