[PATCH RFC u-boot-mvebu 20/59] cmd: mvebu/bubt: Add support for selecting eMMC HW partition

[Pali Rohár]

On Wednesday 22 February 2023 10:55:54 Stefan Roese wrote:
> Hi Pali,
> 
> On 2/21/23 21:18, Pali Rohár wrote:
> > Support for burning into the correct eMMC HW boot partition was broken and
> > removed in commit 96be2f072768 ("mvebu: bubt: Drop dead code"). Reimplement
> > this functionality and bring it back again.
> > 
> > Fixes: 96be2f072768 ("mvebu: bubt: Drop dead code")
> > Signed-off-by: Pali Rohár <pali at kernel.org>
> > ---
> >   cmd/mvebu/bubt.c       | 53 ++++++++++++++++++++++++++++++++++++++----
> >   doc/mvebu/cmd/bubt.txt | 21 ++++++++++++-----
> >   2 files changed, 63 insertions(+), 11 deletions(-)
> > 
> > diff --git a/cmd/mvebu/bubt.c b/cmd/mvebu/bubt.c
> > index 2bcdf145f64a..4bad9a69527c 100644
> > --- a/cmd/mvebu/bubt.c
> > +++ b/cmd/mvebu/bubt.c
> > @@ -189,6 +189,11 @@ static int mmc_burn_image(size_t image_size)
> >   #ifdef CONFIG_BLK
> >   	struct blk_desc *blk_desc;
> >   #endif
> > +#ifdef CONFIG_SUPPORT_EMMC_BOOT
> > +	u8		part;
> > +	u8		orig_part;
> > +#endif
> > +
> >   	mmc = find_mmc_device(mmc_dev_num);
> >   	if (!mmc) {
> >   		printf("No SD/MMC/eMMC card found\n");
> > @@ -202,6 +207,38 @@ static int mmc_burn_image(size_t image_size)
> >   		return err;
> >   	}
> > +#ifdef CONFIG_BLK
> > +	blk_desc = mmc_get_blk_desc(mmc);
> > +	if (!blk_desc) {
> > +		printf("Error - failed to obtain block descriptor\n");
> > +		return -ENODEV;
> > +	}
> > +#endif
> 
> This #ifdef usage really gets out of hand IMHO. Yes I know, you did not
> introduce it here. Still, perhaps some of this can be moved to using
> IS_ENABLED or CONFIG_IS_ENABLED instead?
> 
> And I just checked that "bubt" is not compiled for CONFIG_BLK not
> defined. So please depend this file on CONFIG_BLK in Kconfig and remove
> the non CONFIG_BLK code here.

bubt is used for at least 4 different mvebu platforms (AXP, A38x, A3720,
A7K) and every one has slightly different code and configuration.

I really do not know if all those configurations support CONFIG_BLK, so
I decided to let it as it was before to eliminate possible issues.

> Thanks,
> Stefan
> 
> > +
> > +#ifdef CONFIG_SUPPORT_EMMC_BOOT
> > +#ifdef CONFIG_BLK
> > +	orig_part = blk_desc->hwpart;
> > +#else
> > +	orig_part = mmc->block_dev.hwpart;
> > +#endif
> > +
> > +	part = (mmc->part_config >> 3) & PART_ACCESS_MASK;
> > +
> > +	if (part == 7)
> > +		part = 0;
> > +
> > +#ifdef CONFIG_BLK
> > +	err = blk_dselect_hwpart(blk_desc, part);
> > +#else
> > +	err = mmc_switch_part(mmc, part);
> > +#endif
> > +
> > +	if (err) {
> > +		printf("Error - MMC partition switch failed\n");
> > +		return err;
> > +	}
> > +#endif
> > +
> >   	/* SD reserves LBA-0 for MBR and boots from LBA-1,
> >   	 * MMC/eMMC boots from LBA-0
> >   	 */
> > @@ -211,11 +248,6 @@ static int mmc_burn_image(size_t image_size)
> >   	if (image_size % mmc->write_bl_len)
> >   		blk_count += 1;
> > -	blk_desc = mmc_get_blk_desc(mmc);
> > -	if (!blk_desc) {
> > -		printf("Error - failed to obtain block descriptor\n");
> > -		return -ENODEV;
> > -	}
> >   	blk_written = blk_dwrite(blk_desc, start_lba, blk_count,
> >   				 (void *)get_load_addr());
> >   #else
> > @@ -227,6 +259,17 @@ static int mmc_burn_image(size_t image_size)
> >   						 start_lba, blk_count,
> >   						 (void *)get_load_addr());
> >   #endif /* CONFIG_BLK */
> > +
> > +#ifdef CONFIG_SUPPORT_EMMC_BOOT
> > +#ifdef CONFIG_BLK
> > +	err = blk_dselect_hwpart(blk_desc, orig_part);
> > +#else
> > +	err = mmc_switch_part(mmc, orig_part);
> > +#endif
> > +	if (err)
> > +		printf("Error - MMC failed to switch back to original partition\n");
> > +#endif
> > +
> >   	if (blk_written != blk_count) {
> >   		printf("Error - written %#lx blocks\n", blk_written);
> >   		return -ENOSPC;
> > diff --git a/doc/mvebu/cmd/bubt.txt b/doc/mvebu/cmd/bubt.txt
> > index 6051243f1165..1fe1f07dd187 100644
> > --- a/doc/mvebu/cmd/bubt.txt
> > +++ b/doc/mvebu/cmd/bubt.txt
> > @@ -14,8 +14,7 @@ Examples:
> >   Notes:
> >   - For the TFTP interface set serverip and ipaddr.
> > -- To burn image to SD/eMMC device, the target is defined
> > -  by parameters CONFIG_SYS_MMC_ENV_DEV and CONFIG_SYS_MMC_ENV_PART.
> > +- To burn image to SD/eMMC device, the target is defined by HW partition.
> >   Bubt command details (burn image step by-step)
> >   ----------------------------------------------
> > @@ -40,10 +39,20 @@ Notes:
> >     Number 0 is used for user data partition and should not be utilized for storing
> >     boot images and U-Boot environment in RAW mode since it will break file system
> >     structures usually located here.
> > -  The default boot partition is BOOT0. It is selected by the following parameter:
> > -  CONFIG_SYS_MMC_ENV_PART=1
> > -  Valid values for this parameter are 1 for BOOT0 and 2 for BOOT1.
> > -  Please never use partition number 0 here!
> > +
> > +  Currently configured boot partition can be printed by command:
> > +  # mmc partconf 0
> > +  (search for BOOT_PARTITION_ACCESS output, number 7 is user data)
> > +
> > +  Change it to BOOT0:
> > +  # mmc partconf 0 0 1 1
> > +
> > +  Change it to BOOT1:
> > +  # mmc partconf 0 0 2 2
> > +
> > +  Change it to user data:
> > +  # mmc partconf 0 0 7 0
> > +
> >   - The partition number is ignored if the target device is SD card.
> >   - The boot image offset starts at block 0 for eMMC and block 1 for SD devices.
> >     The block 0 on SD devices is left for MBR storage.
> 
> Viele Grüße,
> Stefan Roese
> 
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