Hi, Baruch,
-----Original Message----- From: Baruch Siach [mailto:baruch@tkos.co.il] Sent: Tuesday, December 19, 2017 08:43 To: Kostya Porotchkin Cc: Stefan Roese; u-boot@lists.denx.de; Sergey Matyukevich Subject: Re: [EXT] [PATCH] arm64: mvebu: armada-8k: support SD card environment
Hi Kostya,
Thanks for reviewing.
On Thu, Dec 14, 2017 at 11:28:18AM +0000, Kostya Porotchkin wrote:
Allow storing the environment on the Macchiatobin SD card. This is useful for distribution of SD card software images. Currently, the environment is always loaded from the SPI flash whose content might be incompatible with SD card kernel loading.
Use the last 64KB of the 32MB boot partition as per the instructions in the Macchiatobin wiki:
http://wiki.macchiatobin.net/tiki- index.php?page=Setup+alternative+boot+sources
Cc: Konstantin Porotchkin kostap@marvell.com Signed-off-by: Baruch Siach baruch@tkos.co.il
include/configs/mvebu_armada-8k.h | 5 +++++ 1 file changed, 5 insertions(+)
diff --git a/include/configs/mvebu_armada-8k.h b/include/configs/mvebu_armada-8k.h index d85527434a0a..0457a72e353b 100644 --- a/include/configs/mvebu_armada-8k.h +++ b/include/configs/mvebu_armada-8k.h @@ -73,7 +73,12 @@ #define CONFIG_SF_DEFAULT_MODE SPI_MODE_0 #define CONFIG_ENV_SPI_MODE CONFIG_SF_DEFAULT_MODE
+#if defined(CONFIG_ENV_IS_IN_SPI_FLASH) #define CONFIG_ENV_OFFSET 0x180000 /* as Marvell U-Boot
version */
+#elif defined(CONFIG_ENV_IS_IN_MMC) +#define CONFIG_SYS_MMC_ENV_DEV 1 +#define CONFIG_ENV_OFFSET 0x21f0000 +#endif
I think this will break boot from the on-board eMMC device. Maybe the environment offset should be connected to the MMC device ID. So it will be different for SD and eMMC. The eMMC boot partition is not that big as the space on SD allocated
for the boot images.
Additionally, the SD pre-allocated boot space is not really a constant
value.
So what would you suggest? How can we detect the location of the SD/eMMC stored environment? Would a per-board 'u-boot,mmc-env-offset' DT property help? Maybe move to CONFIG_ENV_IS_IN_FAT?
[Konstantin Porotchkin] What we know for sure is that partition 0 is always the data partition for both SD and eMMC. This is the only partition in case of SD and it less likely to be used with eMMC at all. So we can, for example, use your environment offset when the CONFIG_SYS_MMC_ENV_PART=0 As for the value of CONFIG_SYS_MMC_ENV_DEV, we cannot assume that it will have the same meaning for all Marvell A8K platforms. On some boards the device 1 may be the eMMC as well. Since this header is shared across all boards, I would not hard code the device 1 as SD. Using file for the environment storage when we boot from the data partition is also possible. In this case we do not have the dependency from the size of the empty space allocated before the first partition entry.
Kosta
baruch
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