[PATCH] sunxi-nand: fix the PIO instead of DMA implementation
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
Signed-off-by: Markus Hoffrogge mhoffrogge@gmail.com --- drivers/mtd/nand/raw/sunxi_nand_spl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand_spl.c b/drivers/mtd/nand/raw/sunxi_nand_spl.c index a29a76c58d..6de0b0a355 100644 --- a/drivers/mtd/nand/raw/sunxi_nand_spl.c +++ b/drivers/mtd/nand/raw/sunxi_nand_spl.c @@ -208,7 +208,7 @@ static void nand_apply_config(const struct nfc_config *conf)
val = readl(SUNXI_NFC_BASE + NFC_CTL); val &= ~NFC_CTL_PAGE_SIZE_MASK; - writel(val | NFC_CTL_RAM_METHOD | NFC_CTL_PAGE_SIZE(conf->page_size), + writel(val | NFC_CTL_PAGE_SIZE(conf->page_size), SUNXI_NFC_BASE + NFC_CTL); writel(conf->ecc_size, SUNXI_NFC_BASE + NFC_CNT); writel(conf->page_size, SUNXI_NFC_BASE + NFC_SPARE_AREA); --
Hi Markus,
+ Maxime, for the record :)
mhoffrogge@gmail.com wrote on Thu, 30 Jun 2022 01:26:39 +0200:
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
Good to know that someone tackled this, Maxime already reported some time ago that it was broken for a number of boards but I never took the time to investigate, apologies.
Signed-off-by: Markus Hoffrogge mhoffrogge@gmail.com
drivers/mtd/nand/raw/sunxi_nand_spl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand_spl.c b/drivers/mtd/nand/raw/sunxi_nand_spl.c index a29a76c58d..6de0b0a355 100644 --- a/drivers/mtd/nand/raw/sunxi_nand_spl.c +++ b/drivers/mtd/nand/raw/sunxi_nand_spl.c @@ -208,7 +208,7 @@ static void nand_apply_config(const struct nfc_config *conf)
val = readl(SUNXI_NFC_BASE + NFC_CTL); val &= ~NFC_CTL_PAGE_SIZE_MASK;
- writel(val | NFC_CTL_RAM_METHOD | NFC_CTL_PAGE_SIZE(conf->page_size),
- writel(val | NFC_CTL_PAGE_SIZE(conf->page_size), SUNXI_NFC_BASE + NFC_CTL); writel(conf->ecc_size, SUNXI_NFC_BASE + NFC_CNT); writel(conf->page_size, SUNXI_NFC_BASE + NFC_SPARE_AREA);
--
Thanks, Miquèl
On Thu, Jun 30, 2022 at 09:13:22AM +0200, Miquel Raynal wrote:
Hi Markus,
- Maxime, for the record :)
mhoffrogge@gmail.com wrote on Thu, 30 Jun 2022 01:26:39 +0200:
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
Good to know that someone tackled this, Maxime already reported some time ago that it was broken for a number of boards but I never took the time to investigate, apologies.
Oh, that's awesome, thanks for tackling this :)
Maxime
Hi Miquel, hi Maxime,
could you probably run a test on a newer Allwinner SOC - like e.g. SUNI8, SUNI9, SUNI50 or newer, since I can test it on a SUNI7 (A20) board only?
The only aspect that makes me wonder is, that it did work on your hardware before at all.
Maybe this is, since that NFC_CTL_RAM_METHOD flag does not matter on newer SOC, if the DMA channel is not enabled for the NFC.
Markus Am Do., 30. Juni 2022 um 09:31 Uhr schrieb Maxime Ripard maxime@cerno.tech:
On Thu, Jun 30, 2022 at 09:13:22AM +0200, Miquel Raynal wrote:
Hi Markus,
- Maxime, for the record :)
mhoffrogge@gmail.com wrote on Thu, 30 Jun 2022 01:26:39 +0200:
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
Good to know that someone tackled this, Maxime already reported some time ago that it was broken for a number of boards but I never took the time to investigate, apologies.
Oh, that's awesome, thanks for tackling this :)
Maxime
On Thu, Jun 30, 2022 at 10:04:31AM +0200, Markus Hoffrogge wrote:
Hi Miquel, hi Maxime,
could you probably run a test on a newer Allwinner SOC - like e.g. SUNI8, SUNI9, SUNI50 or newer, since I can test it on a SUNI7 (A20) board only?
The only aspect that makes me wonder is, that it did work on your hardware before at all.
Maybe this is, since that NFC_CTL_RAM_METHOD flag does not matter on newer SOC, if the DMA channel is not enabled for the NFC.
I don't have any of those boards anymore, but that sounds plausible
Maxime
Hi. Markus.
"Markus" == Markus Hoffrogge mhoffrogge@gmail.com writes:
Markus> Hi Miquel, hi Maxime, could you probably run a test on a newer Allwinner SOC - like e.g. Markus> SUNI8, SUNI9, SUNI50 or newer, since I can test it on a SUNI7 (A20) board only?
I have a topwise A721 tablet which is sun4i (A10). Should I test on it?.
How to test it?. Just download latest 2022-07-rc and see if archlinux boots?
Best Regards
Am Do., 30. Juni 2022 um 16:01 Uhr schrieb andrés ramírez rrandresf@hotmail.com:
Hi. Markus.
"Markus" == Markus Hoffrogge mhoffrogge@gmail.com writes:
Markus> Hi Miquel, hi Maxime, could you probably run a test on a newer Allwinner SOC - like e.g. Markus> SUNI8, SUNI9, SUNI50 or newer, since I can test it on a SUNI7 (A20) board only?I have a topwise A721 tablet which is sun4i (A10). Should I test on it?.
How to test it?. Just download latest 2022-07-rc and see if archlinux boots?
Hi Andrés,
you can try, but A10 to me is not that critical, since the NFC is close to the one of A20. Yes, you would have to replace the SPL U-Boot in the SPL partition of the NAND.
br Markus
Hi Andre,
as this patch has been delegated to you, I would like to mention, that this patch is superseding the patch https://patchwork.ozlabs.org/project/uboot/patch/20220330204543.3790-1-macro... raised by Chris Morgan.
It should solve the issue in general and does not require to revert to the former DMA implementation.
Kind regards Markus
On Thu, 30 Jun 2022 23:30:50 +0200 Markus Hoffrogge mhoffrogge@gmail.com wrote:
Hi Markus,
as this patch has been delegated to you,
thanks for sending the patch, and for the heads up, looks like we should add that file somewhere into MAINTAINERS. (And please keep people on CC:, to not split up the thread on the list).
I would like to mention, that this patch is superseding the patch https://patchwork.ozlabs.org/project/uboot/patch/20220330204543.3790-1-macro... raised by Chris Morgan.
So from a first look at it, I like this version better, mostly because it's much shorter ;-)
That being said, I tried to stay away from raw NAND as much as possible in the past, and thought that our support in U-Boot is very minimal. So can someone please enlighten me about the status: - AFAIK raw NAND is only supported on the C.H.I.P. Pro, because this is one the few devices featuring SLC NAND. I guess the main feature of raw NAND is that it's cheaper, so using SLC instead of MLC kind of defeats the main purpose of it. - Is there a separate SPL story? As in: loading U-Boot proper from NAND when the BROM loaded the SPL from there? IIUC read disturbance makes even that part non-trivial. - Because of the absence of SLC in modern devices, and the prevalence of eMMC, raw NAND was rarely used on modern devices (>= H3). So did we ever support that? My understanding was that the NAND controller itself is fairly similar (is it?), but the MLC problem would still persist. - How do you actually write to the NAND? It seems like even reading is non-trivial, so is this done from U-Boot, (BSP?) Linux, or using vendor tools, probably via FEL?
I recently got an H6 TV box, which happens to use raw (MLC) NAND flash. I also inherited a Cubietruck, which is MLC as well. So can I use that storage, at least for the firmware?
If yes, this should be documented somewhere, I guess? Or is it already?
Cheers, Andre
It should solve the issue in general and does not require to revert to the former DMA implementation.
Kind regards Markus
Am Fr., 1. Juli 2022 um 11:57 Uhr schrieb Andre Przywara < andre.przywara@arm.com>: Hi Andre,
On Thu, 30 Jun 2022 23:30:50 +0200 Markus Hoffrogge mhoffrogge@gmail.com wrote:
Hi Markus,
as this patch has been delegated to you,
thanks for sending the patch, and for the heads up, looks like we should add that file somewhere into MAINTAINERS. (And please keep people on CC:, to not split up the thread on the list).
I would like to mention, that this patch is superseding the patch
https://patchwork.ozlabs.org/project/uboot/patch/20220330204543.3790-1-macro...
raised by Chris Morgan.
So from a first look at it, I like this version better, mostly because it's much shorter ;-)
That being said, I tried to stay away from raw NAND as much as possible in the past, and thought that our support in U-Boot is very minimal. So can someone please enlighten me about the status:
- AFAIK raw NAND is only supported on the C.H.I.P. Pro, because this is
one the few devices featuring SLC NAND. I guess the main feature of raw NAND is that it's cheaper, so using SLC instead of MLC kind of defeats the main purpose of it.
- Is there a separate SPL story? As in: loading U-Boot proper from NAND
when the BROM loaded the SPL from there? IIUC read disturbance makes even that part non-trivial.
- Because of the absence of SLC in modern devices, and the prevalence of
eMMC, raw NAND was rarely used on modern devices (>= H3). So did we ever support that? My understanding was that the NAND controller itself is fairly similar (is it?), but the MLC problem would still persist.
I fully agree, but the MLC problem has been adressed already a while ago by introducing the slc_mode on mainline Kernel for MLC with the NAND page pairing approach by Boris Brezillon and Richard Weinberger. See https://bootlin.com/pub/conferences/2016/elce/brezillon-ubi-mlc/ubi-mlc.pdf.
It will half the usable size of the NAND, but I guess it is perfect and best approach for getting the MLC used in a most robust way. So this at least should be sufficient for using it for some minimal rootfs for boot configuration or initial startup OS for configuring and e.g. attaching/initializing a SATA SSD.
Main motivation is to get the board NAND booting not to rely on a SD card, since this is weak in rough or industrial environments and the SDCard slot should be free for other usage. The OS will be on a SATA SSD in most usecases anyway.
- How do you actually write to the NAND? It seems like even reading is
non-trivial, so is this done from U-Boot, (BSP?) Linux, or using vendor tools, probably via FEL?
Writing to MLC NAND I am doing as follows on a Cubietruck (CT): 1. I create an Armbian image for SDCARD for the CT with a currently user patched CT UBoot and kernel config with the following: (I will provide an appropriate patch for this separately later) Note: This CT config extension does not break the SDCard boot. - enabling SUNXI NAND and SUNXI NAND SPL Extended config on UBoot configs/Cubietruck_defconfig: [...append to current CT config] CONFIG_NAND=y CONFIG_NAND_SUNXI=y CONFIG_MTD=y CONFIG_MTD_RAW_NAND=y # # SPL loader NAND offsets according to Kernel # .dts mtd partitions: # CONFIG_SYS_NAND_U_BOOT_OFFS=0x400000 CONFIG_SYS_NAND_U_BOOT_OFFS_REDUND=0x600000 # # CT specific Hynix MLC NAND 27UCG8T2ATR-BC config: # CONFIG_NAND_SUNXI_SPL_ECC_STRENGTH=64 CONFIG_NAND_SUNXI_SPL_ECC_SIZE=1024 CONFIG_NAND_SUNXI_SPL_USABLE_PAGE_SIZE=4096 CONFIG_SYS_NAND_PAGE_SIZE=8192 CONFIG_SYS_NAND_OOBSIZE=640 CONFIG_SYS_NAND_BLOCK_SIZE=0x200000 [EOF] - overlay .dts for the kernel to add nfc node with SPL and UBoot NAND partitions 2MB each on NAND blocksize boundaries providing: - /dev/mtd0 - SPL - /dev/mtd1 - SPL-backup - /dev/mtd2 - UBoot - /dev/mtd3 - UBoot-backup - /dev/mtd4 - UBI (UBI in slc_mode for rootfs - later use) This rootfs yould more or less hold the kernel image and other scripts relevant for booring to be more flexible for updates on the kernel and the boot environment scripts. - add mtd-utils package for the OS - I will provide a github link for my Armbian fork soon its not yet commited 2. Plugin SDCard and boot CT with this image from SD card - copy UBoot SPL ./spl/sunxi-spl-with-ecc.bin to the CT - copy UBoot image u-boot-dtb.img to the CT 3. Logon to CT and run on CT: - erase /dev/mtd0 - sudo flash_erase /dev/mtd0 0 0 - write the SUNXI UBoot SPL ./spl/sunxi-spl-with-ecc.bin to /dev/mtd0 - sudo nandwrite -o -n /dev/mtd0 sunxi-spl-with-ecc.bin - erase /dev/mtd2 - sudo flash_erase /dev/mtd2 0 0 - write u-boot-dtb.img to /dev/mtd2 - sudo nandwrite -p /dev/mtd2 u-boot-dtb.img 4. Shutdown CT 5. Unplug SDCard and reboot - Now CT boots from NAND and will find SATA OS, if SATA available
I recently got an H6 TV box, which happens to use raw (MLC) NAND flash. I
also inherited a Cubietruck, which is MLC as well. So can I use that storage, at least for the firmware?
Yes, CT should work as described above.
If yes, this should be documented somewhere, I guess? Or is it already?
No, it is not yet documented. I am currently working on an approrpiate pull request for Armbian build. I would like to finish up with the UBI partition setup to complete that portion. For this U-Boot CT config I am supposed to provide another patch later.
Where would be the best place to document this on the U-Boot tree ?
br Markus
Cheers, Andre
It should solve the issue in general and does not require to
revert to the former DMA implementation.
Kind regards Markus
Hi
On Thu, Jun 30, 2022 at 9:31 AM Maxime Ripard maxime@cerno.tech wrote:
On Thu, Jun 30, 2022 at 09:13:22AM +0200, Miquel Raynal wrote:
Hi Markus,
- Maxime, for the record :)
mhoffrogge@gmail.com wrote on Thu, 30 Jun 2022 01:26:39 +0200:
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
Good to know that someone tackled this, Maxime already reported some time ago that it was broken for a number of boards but I never took the time to investigate, apologies.
Oh, that's awesome, thanks for tackling this :)
I don't have boards too with Allwinner but maybe Jagan has
Michael
Maxime
On Thu, 30 Jun 2022 01:26:39 +0200 Markus Hoffrogge mhoffrogge@gmail.com wrote:
Hi,
The sunxi nand SPL loader was broken at least for SUN4I, SUN5I and SUN7I SOCs since the implementation change from DMA to PIO usage - commit 6ddbb1e.
Root cause for this issue is the NFC control flag NFC_CTL_RAM_METHOD being set by method nand_apply_config.
This flag controls the bus being used for the NFCs internal RAM access. It must be set for the DMA use case only. See A33_Nand_Flash_Controller_Specification.pdf page 12.
This fix is tested by myself on a Cubietruck A20 board. Others should test it on new generation SOCs as well.
I can't really test this, but looking at the datasheet indeed bit 14 must not be set when we intend to read the SRAM buffers directly via MMIO.
Signed-off-by: Markus Hoffrogge mhoffrogge@gmail.com
Reviewed-by: Andre Przywara andre.przywara@arm.com
Applied to sunxi/master.
Cheers, Andre
drivers/mtd/nand/raw/sunxi_nand_spl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/mtd/nand/raw/sunxi_nand_spl.c b/drivers/mtd/nand/raw/sunxi_nand_spl.c index a29a76c58d..6de0b0a355 100644 --- a/drivers/mtd/nand/raw/sunxi_nand_spl.c +++ b/drivers/mtd/nand/raw/sunxi_nand_spl.c @@ -208,7 +208,7 @@ static void nand_apply_config(const struct nfc_config *conf)
val = readl(SUNXI_NFC_BASE + NFC_CTL); val &= ~NFC_CTL_PAGE_SIZE_MASK;
- writel(val | NFC_CTL_RAM_METHOD | NFC_CTL_PAGE_SIZE(conf->page_size),
- writel(val | NFC_CTL_PAGE_SIZE(conf->page_size), SUNXI_NFC_BASE + NFC_CTL); writel(conf->ecc_size, SUNXI_NFC_BASE + NFC_CNT); writel(conf->page_size, SUNXI_NFC_BASE + NFC_SPARE_AREA);
--
participants (6)
-
Andre Przywara -
andrés ramírez -
Markus Hoffrogge -
Maxime Ripard -
Michael Nazzareno Trimarchi -
Miquel Raynal