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On 08.02.2018 09:47, Maxime Ripard wrote:
On Wed, Feb 07, 2018 at 02:17:12PM -0800, York Sun wrote:
Commit 8a3a7e2270b3 ("env: Pass additional parameters to the env lookup function") dropped the default action if driver doesn't have get_char() defined. This causes failure to get environmental variables from NOR flash. Add back this default action for now.
Signed-off-by: York Sun york.sun@nxp.commailto:york.sun@nxp.com CC: Maxime Ripard maxime.ripard@free-electrons.commailto:maxime.ripard@free-electrons.com --- Limited test on LS1043ARDB.
env/env.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/env/env.c b/env/env.c index edfb575..210bae2 100644 --- a/env/env.c +++ b/env/env.c @@ -159,7 +159,7 @@ int env_get_char(int index) int ret;
if (!drv->get_char) - continue; + return *(uchar *)(gd->env_addr + index);
Thinking more about this, I think this would break the case where the first environment in your list has no get_char method, but the second might.
How can we decide which way is wanted? With your patch below, we might end up loading chars from a low-prio environment (which is not CRC checked) in the early boot stage. Later, we load the environment from another env driver with higher priority.
That's why I suggested removing the 'get_char' callback from the env drivers :-) Early boot stage environment lookups would still work the old way reading from 'gd->env_addr + index'.
Simon
Would something like that work?
------------ 8< -------- diff --git a/env/env.c b/env/env.c index 9a89832c1aaf..391c9c0df2f0 100644 --- a/env/env.c +++ b/env/env.c @@ -152,6 +152,7 @@ static struct env_driver *env_driver_lookup(enum env_operation op, int prio) int env_get_char(int index) { struct env_driver *drv; + bool has_get_char = false; int prio;
if (gd->env_valid == ENV_INVALID) @@ -166,6 +167,7 @@ int env_get_char(int index) if (!env_has_inited(drv->location)) continue;
+ has_get_char = true; ret = drv->get_char(index); if (!ret) return 0; @@ -174,6 +176,9 @@ int env_get_char(int index) drv->name, ret); }
+ if (!has_get_char) + return *(uchar *)(gd->env_addr + index); + return -ENODEV; } ------ 8< -------
Thanks! Maxime
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