Hi Sergey,
On 10/09/2016 01:49 PM, Sergey Kubushyn wrote:
This allows to place U-Boot environment into eMMC boot partition thus saving space on user partition for the OS (or whatever.) When booting off of eMMC many (all?) MCUs can use dedicated boot0/boot1 partitions to boot so U-Boot (or SPL) is written to one (or both) such partitions. When such boot configuration is used it makes sense to place environment in the same partition where the U-Boot itself is so the entire user partition is available for the OS.
I didn't read the entire comments of previous version. (Will read) And this patch should be dead code..there is no case with using patch. Do you have a plan to add other patch?
i don't know what makes sense for this..
And this concept should be dangerous...If overwrite to wrong location. it can be bricked.
Well, i need to consider it's really useful to locate the environment into boot partition. So I didn't add the comment about code side.
Best Regards, Jaehoon Chung
It might be not well polished yet but it is a simple patch that can be reworked later.
It uses 4 Kconfig variables right now which probably belong to the board Kconfig. Those are:
CONFIG_ENV_IN_EMMC_BOOT -- tells that environment is in eMMC boot partition if defined
CONFIG_EMMC_ENV_PART -- tells which boot partition environment should be stored in (either 1 or 2)
CONFIG_EMMC_BOOT_PART -- which boot partition will be used by eMMC to read U-Boot/SPL binary for boot protocol (either 1 or 2.) That can be different from the environment partition
CONFIG_EMMC_BOOT_ACK -- tells that eMMC should provide boot ACKs if defined
Here is an excerpt from actual board Kconfig:
=== Cut === config ENV_IN_EMMC_BOOT bool "Environment is in eMMC boot partition" default y
config EMMC_ENV_PART hex "eMMC boot partition used for environment (1 or 2)" default 1
config EMMC_BOOT_PART hex "eMMC boot partition the board boots off of (1 or 2)" default 1
config EMMC_BOOT_ACK bool "Enable ACKs from eMMC when booting off of boot partition" default n === Cut ===
Signed-off-by: Sergey Kubushyn ksi@koi8.net Cc: Tom Rini trini@konsulko.com Cc: Pantelis Antoniou panto@antoniou-consulting.com
common/env_mmc.c | 50 ++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 50 insertions(+)
diff --git a/common/env_mmc.c b/common/env_mmc.c index 16f6a17..3b2477c 100644 --- a/common/env_mmc.c +++ b/common/env_mmc.c @@ -68,6 +68,45 @@ int env_init(void) return 0; }
+#ifdef CONFIG_ENV_IN_EMMC_BOOT +__weak u8 mmc_get_env_part(struct mmc *mmc) +{
- return CONFIG_EMMC_ENV_PART;
+}
+__weak u8 mmc_get_boot_part(struct mmc *mmc) +{
- return CONFIG_EMMC_BOOT_PART;
+}
+__weak u8 mmc_get_boot_ack(struct mmc *mmc) +{ +#ifdef CONFIG_EMMC_BOOT_ACK
- return 1;
+#else
- return 0;
+#endif +}
+static int mmc_set_env_part(struct mmc *mmc) +{
- int ret = 0;
- u8 boot_part = 0;
- u8 boot_ack = 0;
- u8 env_part = 0;
- boot_part = mmc_get_boot_part(mmc);
- boot_ack = mmc_get_boot_ack(mmc);
- env_part = mmc_get_env_part(mmc);
- ret = mmc_set_part_conf(mmc, boot_ack, boot_part, env_part);
- if (ret)
puts("MMC switch to boot partition failed\n");- return ret;
+} +#else #ifdef CONFIG_SYS_MMC_ENV_PART __weak uint mmc_get_env_part(struct mmc *mmc) { @@ -96,6 +135,7 @@ static int mmc_set_env_part(struct mmc *mmc) #else static inline int mmc_set_env_part(struct mmc *mmc) {return 0; }; #endif +#endif
static const char *init_mmc_for_env(struct mmc *mmc) { @@ -113,6 +153,15 @@ static const char *init_mmc_for_env(struct mmc *mmc)
static void fini_mmc_for_env(struct mmc *mmc) { +#ifdef CONFIG_ENV_IN_EMMC_BOOT
- u8 boot_part = 0;
- u8 boot_ack = 0;
- boot_part = mmc_get_boot_part(mmc);
- boot_ack = mmc_get_boot_ack(mmc);
- mmc_set_part_conf(mmc, boot_ack, boot_part, 0);
+#else #ifdef CONFIG_SYS_MMC_ENV_PART int dev = mmc_get_env_dev();
@@ -121,6 +170,7 @@ static void fini_mmc_for_env(struct mmc *mmc) #endif blk_select_hwpart_devnum(IF_TYPE_MMC, dev, env_mmc_orig_hwpart); #endif +#endif }
#ifdef CONFIG_CMD_SAVEENV