Hi Andreas,
On 05/19/2014 03:48 PM, Andreas Bießmann wrote:
Hi Bo,
On 05/19/2014 05:13 AM, Bo Shen wrote:
On 05/16/2014 05:59 PM, Andreas Bießmann wrote:
For sama5d3xek we need to modify the SPL image for correct detection
by ROM
code.
Signed-off-by: Andreas Bießmann <andreas.de...@googlemail.com>
---
Changes in v2:
* add -n switch to mkimage for PMECC type NAND and CONFIG_SYS_NANDFLASH
arch/arm/cpu/armv7/at91/config.mk | 10 ++++++++++
doc/README.atmel_pmecc | 30 ++++++++++++++++++++++++++++++
spl/Makefile | 18 ++++++++++++++++++
3 files changed, 58 insertions(+)
create mode 100644 arch/arm/cpu/armv7/at91/config.mk
diff --git a/doc/README.atmel_pmecc b/doc/README.atmel_pmecc
index cf8373b..5a93123 100644
--- a/doc/README.atmel_pmecc
+++ b/doc/README.atmel_pmecc
@@ -27,3 +27,33 @@ Take AT91SAM9X5EK as an example, the board
definition file likes:
#define CONFIG_ATMEL_NAND_HW_PMECC 1
#define CONFIG_PMECC_CAP 2
#define CONFIG_PMECC_SECTOR_SIZE 512
+
+How to enable PMECC header for direct programmable boot.bin
+-----------------------------------------------------------
+2014-05-15 Andreas Bießmann <andreas.de...@googlemail.com>
+
+The usual way to program SPL into NAND flash is to use the SAM-BA
Atmel tool.
+This however is often not usable when doing field updates. To be able to
+program a SPL binary into NAND flash we need to add the PMECC header
to the
+binary before. Chapter '12.4.4.1 NAND Flash Boot: NAND Flash
Detection' in
+sama5d3 SoC spec (as of 03. April 2014). We have a new image type
added to
+mkimage to generate this PMECC header and integrated into the build
process of
+SPL.
+The required parameters in board configuration header are as follows:
+
+This example is working for sama5d3xek:
+
+#define CONFIG_SPL_AT91_HEADER_USE_PMECC 1
+#define CONFIG_SPL_AT91_HEADER_SECTOR_PER_PAGE 4
+#define CONFIG_SPL_AT91_HEADER_SECTOR_SIZE CONFIG_PMECC_SECTOR_SIZE
+#define CONFIG_SPL_AT91_HEADER_SPARE_SIZE 64
+#define CONFIG_SPL_AT91_HEADER_ECC_BITS CONFIG_PMECC_CAP
+#define CONFIG_SPL_AT91_HEADER_ECC_OFFSET 36
Just a nitpick here:
Can we take this parameter from the existing definition while not use
new definition? Or else, if the header using different parameter with
what u-boot nand driver use, then if flash through u-boot, it won't boot.
I used the two parameters I found, sorry the rest isn't defiend anywhere
(or I can't find). Can you give me pointers to the other parameters?
Can we use the following information?
CONFIG_SPL_AT91_HEADER_USE_PMECC: CONFIG_ATMEL_NAND_HW_PMECC
CONFIG_SPL_AT91_HEADER_SECTOR_PER_PAGE: CONFIG_SYS_NAND_PAGE_SIZE /
CONFIG_PMECC_SECTOR_SIZE
CONFIG_SPL_AT91_HEADER_SPARE_SIZE: CONFIG_SYS_NAND_OOBSIZE
CONFIG_SPL_AT91_HEADER_ECC_OFFSET: this need a little bit more
calculation. take 4 bits (caps = 4) as an example:
ecc_offset = oob_size - ((12 + sector_size / 512) * caps + 7) /8
= 64 - ((12 + 512 / 512) * 4 + 7) / 8 = 36.
I am not sure this is worthwhile.
Best Regards,
Bo Shen
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