* amlogic mmc_partitions support @ 2019-01-14 9:54 Andreas Fenkart 2019-01-14 10:00 ` Neil Armstrong 0 siblings, 1 reply; 5+ messages in thread From: Andreas Fenkart @ 2019-01-14 9:54 UTC (permalink / raw) To: linux-amlogic; +Cc: krzysztof.michonski Hi, What is a feasible way to port the vendor supplied drivers/amlogic/mmc/emmc_partitions.c into something that could be mainlined? My thought is to create a custom block/partition/amlogic.c driver. Would that have a chance to be included in mainline? Anybody else that tries to support the existing amlogic partition format, not the implementation, as is. I want to upgrade the kernel via fw upgrade on existing installations, but not touch the u-boot nor the formatting. /Andi _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: amlogic mmc_partitions support 2019-01-14 9:54 amlogic mmc_partitions support Andreas Fenkart @ 2019-01-14 10:00 ` Neil Armstrong 2019-01-14 14:35 ` Peter Korsgaard 2019-01-14 14:42 ` Andreas Fenkart 0 siblings, 2 replies; 5+ messages in thread From: Neil Armstrong @ 2019-01-14 10:00 UTC (permalink / raw) To: Andreas Fenkart, linux-amlogic; +Cc: krzysztof.michonski Hi Andreas, On 14/01/2019 10:54, Andreas Fenkart wrote: > Hi, > > What is a feasible way to port the vendor supplied > drivers/amlogic/mmc/emmc_partitions.c into something that could be > mainlined? My thought is to create a custom block/partition/amlogic.c > driver. Would that have a chance to be included in mainline? Basically, Amlogic uses the eMMC main partition as a MTD devices and uses a custom DT partition scheme to export named MTD partitions to user-space. They don't use any "standard" partitions schemes on the eMMC main HW partition. Mainline will never support DT-defined MMC partitions, and will never support a MTD indirection to a MMC HW partition either. You can try to implement something similar using FUSE, but it won't be simple. > > Anybody else that tries to support the existing amlogic partition > format, not the implementation, as is. I want to upgrade the kernel > via fw upgrade on existing installations, but not touch the u-boot nor > the formatting. Some people forward ported it, and is available on some git repos around the Khadas VIM support. Neil > > /Andi > > _______________________________________________ > linux-amlogic mailing list > linux-amlogic@lists.infradead.org > http://lists.infradead.org/mailman/listinfo/linux-amlogic > _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: amlogic mmc_partitions support 2019-01-14 10:00 ` Neil Armstrong @ 2019-01-14 14:35 ` Peter Korsgaard 2019-01-14 14:46 ` Neil Armstrong 2019-01-14 14:42 ` Andreas Fenkart 1 sibling, 1 reply; 5+ messages in thread From: Peter Korsgaard @ 2019-01-14 14:35 UTC (permalink / raw) To: Neil Armstrong; +Cc: linux-amlogic, Andreas Fenkart, krzysztof.michonski >>>>> "Neil" == Neil Armstrong <narmstrong@baylibre.com> writes: > Hi Andreas, > On 14/01/2019 10:54, Andreas Fenkart wrote: >> Hi, >> >> What is a feasible way to port the vendor supplied >> drivers/amlogic/mmc/emmc_partitions.c into something that could be >> mainlined? My thought is to create a custom block/partition/amlogic.c >> driver. Would that have a chance to be included in mainline? > Basically, Amlogic uses the eMMC main partition as a MTD devices and uses a > custom DT partition scheme to export named MTD partitions to user-space. > They don't use any "standard" partitions schemes on the eMMC main HW partition. > Mainline will never support DT-defined MMC partitions, and will never support > a MTD indirection to a MMC HW partition either. > You can try to implement something similar using FUSE, but it won't be simple. Not knowing anything about the vendor driver, if this is just about splitting up a single eMMC partition in sub blocks and not about MTD, then this can be easily done with the dm-linear target of device mapper, E.G. something like: dmsetup create FOO --table "0 <size> linear /dev/mmcblk0 <offset>" -- Bye, Peter Korsgaard _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: amlogic mmc_partitions support 2019-01-14 14:35 ` Peter Korsgaard @ 2019-01-14 14:46 ` Neil Armstrong 0 siblings, 0 replies; 5+ messages in thread From: Neil Armstrong @ 2019-01-14 14:46 UTC (permalink / raw) To: Peter Korsgaard; +Cc: linux-amlogic, Andreas Fenkart, krzysztof.michonski Hi Peter, On 14/01/2019 15:35, Peter Korsgaard wrote: >>>>>> "Neil" == Neil Armstrong <narmstrong@baylibre.com> writes: > > > Hi Andreas, > > On 14/01/2019 10:54, Andreas Fenkart wrote: > >> Hi, > >> > >> What is a feasible way to port the vendor supplied > >> drivers/amlogic/mmc/emmc_partitions.c into something that could be > >> mainlined? My thought is to create a custom block/partition/amlogic.c > >> driver. Would that have a chance to be included in mainline? > > > Basically, Amlogic uses the eMMC main partition as a MTD devices and uses a > > custom DT partition scheme to export named MTD partitions to user-space. > > > They don't use any "standard" partitions schemes on the eMMC main HW partition. > > > Mainline will never support DT-defined MMC partitions, and will never support > > a MTD indirection to a MMC HW partition either. > > > You can try to implement something similar using FUSE, but it won't be simple. > > Not knowing anything about the vendor driver, if this is just about > splitting up a single eMMC partition in sub blocks and not about MTD, > then this can be easily done with the dm-linear target of device mapper, > E.G. something like: > > dmsetup create FOO --table "0 <size> linear /dev/mmcblk0 <offset>" > Indeed, it would help, thanks for the pointer. Andreas, this should be done from user-space in an initramfs code right before switching root to the legacy userspace, for example, nothing in the kernel will be accepted to do that. Neil _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic ^ permalink raw reply [flat|nested] 5+ messages in thread
* Re: amlogic mmc_partitions support 2019-01-14 10:00 ` Neil Armstrong 2019-01-14 14:35 ` Peter Korsgaard @ 2019-01-14 14:42 ` Andreas Fenkart 1 sibling, 0 replies; 5+ messages in thread From: Andreas Fenkart @ 2019-01-14 14:42 UTC (permalink / raw) To: Neil Armstrong; +Cc: linux-amlogic, krzysztof.michonski Hi Neil, Am Mo., 14. Jan. 2019 um 11:00 Uhr schrieb Neil Armstrong <narmstrong@baylibre.com>: > > > Basically, Amlogic uses the eMMC main partition as a MTD devices and uses a > custom DT partition scheme to export named MTD partitions to user-space. I've seen the dt section about partitions, but the partition table is also stored on the emmc. It's at an offset (36 MB) and uses a custom c struct. #define MAX_MMC_PART_NUM 32 struct partitions { /* identifier string */ char name[MAX_PART_NAME_LEN]; /* partition size, byte unit */ uint64_t size; /* offset within the master space, byte unit */ uint64_t offset; /* master flags to mask out for this partition */ unsigned mask_flags; }; struct mmc_partitions_fmt { char magic[4]; unsigned char version[12]; int part_num; int checksum; struct partitions partitions[MAX_MMC_PART_NUM]; }; I'm trying to create a prototype. Is this something that could be mainlined then? > > Anybody else that tries to support the existing amlogic partition > > format, not the implementation, as is. I want to upgrade the kernel > > via fw upgrade on existing installations, but not touch the u-boot nor > > the formatting. > > Some people forward ported it, and is available on some git repos around the > Khadas VIM support. thanks, /Andi _______________________________________________ linux-amlogic mailing list linux-amlogic@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-amlogic ^ permalink raw reply [flat|nested] 5+ messages in thread
end of thread, other threads:[~2019-01-14 14:46 UTC | newest] Thread overview: 5+ messages (download: mbox.gz / follow: Atom feed) -- links below jump to the message on this page -- 2019-01-14 9:54 amlogic mmc_partitions support Andreas Fenkart 2019-01-14 10:00 ` Neil Armstrong 2019-01-14 14:35 ` Peter Korsgaard 2019-01-14 14:46 ` Neil Armstrong 2019-01-14 14:42 ` Andreas Fenkart
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