From: Marek Vasut <marex@denx.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 01/11] DM: add block device core
Date: Fri, 21 Sep 2012 17:34:27 +0200 [thread overview]
Message-ID: <201209211734.27842.marex@denx.de> (raw)
In-Reply-To: <56183164.uZ3HcVocPu@bloomfield>
Dear Pavel Herrmann,
[...]
> > > blockctrl = AHCI, PIIX... whichever chip you have between SATA and PCI
> > > (or generally disk-bus and board-bus)
> >
> > So this is for sata ? Or will it also by used for SD/USB flash discs?
>
> no, blockctrl will be used for SATA, PATA, SCSI, and anything of the sort
> (device with several ports, block devices on said ports, ability to send
> read/write/query commands to devices on ports - definitely not USB,
> possibly also SD, but you probably want more operations from SD)
Why not USB flash ? Why not SD, what other stuff do you need for that? Is the
API not misdesigned then?
> > > blockdev = disk, partition, SD card
> >
> > Uh, let's say I understand (even if I don't see the correlation between
> > partition and SD card)
>
> they are an ordered bunch of blocks with a "conventional" filesystem on
> them
You might want to do RAW reads, so why do you put filesystem into this context?
> > > - something that does basic checks
> > > (range, possibility of operation) and submits operations to correct
> > > parent (blockctrl, MMC controller, whatnot).
> >
> > Ascii art might help here greatly (how these pieces fall together). I
> > think I do understand it though.
>
> current code
> user -> FS -> offset calculation from partition info -> drivers/disk
>
> new code
> user -> FS -> blockdev -> blockctrl (or USB or SD controller)
So your "blockctrl" should do the USB/SD/whatever muxing.
> partition blockdev does all the offset calculation and range check that FSs
> do now, and then submits the operation to the parent blockdev, which in
> turn submits it to blockctrl (or an SD controller in case of a SD card, or
> USB controller in case of a USB flash)
Make sure you document this in the next series.
> Pavel Herrmann
Best regards,
Marek Vasut
next prev parent reply other threads:[~2012-09-21 15:34 UTC|newest]
Thread overview: 57+ messages / expand[flat|nested] mbox.gz Atom feed top
2012-09-20 19:37 [U-Boot] [PATCH 00/11] Add DM blockdev subsystem Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 01/11] DM: add block device core Pavel Herrmann
2012-09-20 19:58 ` Marek Vasut
2012-09-21 7:11 ` Pavel Herrmann
2012-09-21 12:39 ` Marek Vasut
2012-09-21 13:27 ` Pavel Herrmann
2012-09-21 13:53 ` Marek Vasut
2012-09-21 14:57 ` Pavel Herrmann
2012-09-21 15:34 ` Marek Vasut [this message]
2012-09-21 15:48 ` Pavel Herrmann
2012-09-21 15:55 ` Marek Vasut
2012-09-21 17:19 ` Pavel Herrmann
2012-09-21 18:00 ` Marek Vasut
2012-09-21 18:53 ` Pavel Herrmann
2012-09-21 19:17 ` Marek Vasut
2012-09-21 19:29 ` Pavel Herrmann
2012-09-21 21:11 ` Marek Vasut
2012-09-21 23:43 ` Pavel Herrmann
2012-09-22 0:09 ` Marek Vasut
2012-09-22 9:39 ` Pavel Herrmann
2012-09-22 13:33 ` Marek Vasut
2012-09-22 13:59 ` Pavel Herrmann
2012-09-24 12:23 ` Pavel Herrmann
2012-09-20 20:49 ` [U-Boot] [U-Boot-DM] " Vikram Narayanan
2012-09-21 7:09 ` Pavel Herrmann
2012-09-21 12:39 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 02/11] DM: add support for scanning DOS partitions to blockdev core Pavel Herrmann
2012-09-20 20:03 ` Marek Vasut
2012-09-21 7:22 ` Pavel Herrmann
2012-09-21 12:47 ` Marek Vasut
2012-09-21 13:18 ` Pavel Herrmann
2012-09-21 13:54 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 03/11] DM: add block controller core Pavel Herrmann
2012-09-20 20:05 ` Marek Vasut
2012-09-21 7:21 ` Pavel Herrmann
2012-09-21 12:51 ` Marek Vasut
2012-09-21 13:14 ` Pavel Herrmann
2012-09-21 13:56 ` Marek Vasut
2012-09-21 15:04 ` Pavel Herrmann
2012-09-21 13:33 ` Pavel Herrmann
2012-09-21 13:58 ` Marek Vasut
2012-09-21 15:09 ` Pavel Herrmann
2012-09-21 15:39 ` Marek Vasut
2012-09-21 15:46 ` Pavel Herrmann
2012-09-21 16:08 ` Marek Vasut
2012-09-21 17:22 ` Pavel Herrmann
2012-09-21 18:01 ` Marek Vasut
2012-09-21 19:15 ` Pavel Herrmann
2012-09-21 19:22 ` Marek Vasut
2012-09-20 19:37 ` [U-Boot] [PATCH 04/11] DM: add sata_legacy driver for blockctrl Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 05/11] DM: add ata and partition blockdev drivers Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 06/11] DM: add cmd_block command Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 07/11] DM: use new blockdev API in FAT Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 08/11] DM: use new blockdev API in ext2 Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 09/11] DM: use new blockdev API in reiserfs Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 10/11] DM: use new blockdev API in ZFS Pavel Herrmann
2012-09-20 19:37 ` [U-Boot] [PATCH 11/11] DM: switch sandbox to DM blockdev Pavel Herrmann
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