Hello Andreas,
this patch fixes the reported BUG().
The output is now:
-----8<---------
OMAP3 DevKit8000 # nandecc hw hamming
1-bit hamming HW ECC selected
OMAP3 DevKit8000 # nandecc hw bch8
Unsupported HW ECC algorithm
NAND_ECC_NONE selected by board driver. This is not recommended !!
OMAP3 DevKit8000 #
----->8---------
Thomas
On 04/05/2013 11:52 AM, Andreas Bießmann wrote:
> With uppcoming BCH support on OMAP devices we need to decide between differnt
> algorithms when switching the ECC engine. Currently we support 1-bit hammign
> and 8-bit BCH on HW backend.
>
> In order to switch between differnet ECC algorithms we need to change the
> interface of omap_nand_switch_ecc() also.
>
> Signed-off-by: Andreas Bießmann <andreas.de...@googlemail.com>
> Cc: Tom Rini <tr...@ti.com>
> Cc: Thomas Weber <thomas.weber.li...@googlemail.com>
> ---
> new in v2
>
> since v2:
> * use void omap_nand_switch_ecc(bool, uint32_t)
> * print warning if unknown HW ecc strengs choosen
> * fix alignment in help test
>
> since v3:
> * reset ecc.mode to NAND_ECC_NONE to prevent a BUG() on wrong eccstrength
> input to changed omap_nand_switch_ecc();
> With this change a user has the chance to switch back to another ECC mode
> via nandecc command.
> Many thanks to Thomas Weber for reporting this.
>
> arch/arm/cpu/armv7/omap3/board.c | 31 ++++++++++----
> arch/arm/include/asm/arch-am33xx/sys_proto.h | 2 +-
> arch/arm/include/asm/arch-omap3/sys_proto.h | 2 +-
> drivers/mtd/nand/omap_gpmc.c | 57
> ++++++++++++++------------
> 4 files changed, 56 insertions(+), 36 deletions(-)
>
> diff --git a/arch/arm/cpu/armv7/omap3/board.c
> b/arch/arm/cpu/armv7/omap3/board.c
> index c6d9a42..b72fadc 100644
> --- a/arch/arm/cpu/armv7/omap3/board.c
> +++ b/arch/arm/cpu/armv7/omap3/board.c
> @@ -328,14 +328,25 @@ void abort(void)
>
> *****************************************************************************/
> static int do_switch_ecc(cmd_tbl_t * cmdtp, int flag, int argc, char * const
> argv[])
> {
> - if (argc != 2)
> + if (argc < 2 || argc > 3)
> goto usage;
> - if (strncmp(argv[1], "hw", 2) == 0)
> - omap_nand_switch_ecc(1);
> - else if (strncmp(argv[1], "sw", 2) == 0)
> - omap_nand_switch_ecc(0);
> - else
> +
> + if (strncmp(argv[1], "hw", 2) == 0) {
> + if (argc == 2) {
> + omap_nand_switch_ecc(1, 1);
> + } else {
> + if (strncmp(argv[2], "hamming", 7) == 0)
> + omap_nand_switch_ecc(1, 1);
> + else if (strncmp(argv[2], "bch8", 4) == 0)
> + omap_nand_switch_ecc(1, 8);
> + else
> + goto usage;
> + }
> + } else if (strncmp(argv[1], "sw", 2) == 0) {
> + omap_nand_switch_ecc(0, 0);
> + } else {
> goto usage;
> + }
>
> return 0;
>
> @@ -345,9 +356,13 @@ usage:
> }
>
> U_BOOT_CMD(
> - nandecc, 2, 1, do_switch_ecc,
> + nandecc, 3, 1, do_switch_ecc,
> "switch OMAP3 NAND ECC calculation algorithm",
> - "[hw/sw] - Switch between NAND hardware (hw) or software (sw) ecc
> algorithm"
> + "hw [hamming|bch8] - Switch between NAND hardware 1-bit hamming and"
> + " 8-bit BCH\n"
> + " ecc calculation (second parameter may"
> + " be omitted).\n"
> + "nandecc sw - Switch to NAND software ecc algorithm."
> );
>
> #endif /* CONFIG_NAND_OMAP_GPMC & !CONFIG_SPL_BUILD */
> diff --git a/arch/arm/include/asm/arch-am33xx/sys_proto.h
> b/arch/arm/include/asm/arch-am33xx/sys_proto.h
> index 0910a94..c913b5f 100644
> --- a/arch/arm/include/asm/arch-am33xx/sys_proto.h
> +++ b/arch/arm/include/asm/arch-am33xx/sys_proto.h
> @@ -39,5 +39,5 @@ struct gpmc_cs;
> void gpmc_init(void);
> void enable_gpmc_cs_config(const u32 *gpmc_config, struct gpmc_cs *cs, u32
> base,
> u32 size);
> -void omap_nand_switch_ecc(int);
> +void omap_nand_switch_ecc(uint32_t, uint32_t);
> #endif
> diff --git a/arch/arm/include/asm/arch-omap3/sys_proto.h
> b/arch/arm/include/asm/arch-omap3/sys_proto.h
> index d60f2ad..dae1312 100644
> --- a/arch/arm/include/asm/arch-omap3/sys_proto.h
> +++ b/arch/arm/include/asm/arch-omap3/sys_proto.h
> @@ -78,7 +78,7 @@ void sr32(void *, u32, u32, u32);
> u32 wait_on_value(u32, u32, void *, u32);
> void sdelay(unsigned long);
> void make_cs1_contiguous(void);
> -void omap_nand_switch_ecc(int);
> +void omap_nand_switch_ecc(uint32_t, uint32_t);
> void power_init_r(void);
> void dieid_num_r(void);
> void do_omap3_emu_romcode_call(u32 service_id, u32 parameters);
> diff --git a/drivers/mtd/nand/omap_gpmc.c b/drivers/mtd/nand/omap_gpmc.c
> index c7d4999..3468c78 100644
> --- a/drivers/mtd/nand/omap_gpmc.c
> +++ b/drivers/mtd/nand/omap_gpmc.c
> @@ -604,13 +604,14 @@ static int omap_read_page_bch(struct mtd_info *mtd,
> struct nand_chip *chip,
>
> #ifndef CONFIG_SPL_BUILD
> /*
> - * omap_nand_switch_ecc - switch the ECC operation b/w h/w ecc and s/w ecc.
> - * The default is to come up on s/w ecc
> - *
> - * @hardware - 1 -switch to h/w ecc, 0 - s/w ecc
> + * omap_nand_switch_ecc - switch the ECC operation between different engines
> + * (h/w and s/w) and different algorithms (hamming and BCHx)
> *
> + * @hardware - true if one of the HW engines should be used
> + * @eccstrength - the number of bits that could be corrected
> + * (1 - hamming, 4 - BCH4, 8 - BCH8, 16 - BCH16)
> */
> -void omap_nand_switch_ecc(int32_t hardware)
> +void omap_nand_switch_ecc(uint32_t hardware, uint32_t eccstrength)
> {
> struct nand_chip *nand;
> struct mtd_info *mtd;
> @@ -628,6 +629,7 @@ void omap_nand_switch_ecc(int32_t hardware)
> nand->options |= NAND_OWN_BUFFERS;
>
> /* Reset ecc interface */
> + nand->ecc.mode = NAND_ECC_NONE;
> nand->ecc.read_page = NULL;
> nand->ecc.write_page = NULL;
> nand->ecc.read_oob = NULL;
> @@ -637,28 +639,31 @@ void omap_nand_switch_ecc(int32_t hardware)
> nand->ecc.calculate = NULL;
>
> /* Setup the ecc configurations again */
> - if (hardware == 1) {
> - nand->ecc.mode = NAND_ECC_HW;
> - nand->ecc.layout = &hw_nand_oob;
> - nand->ecc.size = 512;
> - nand->ecc.bytes = 3;
> - nand->ecc.hwctl = omap_enable_hwecc;
> - nand->ecc.correct = omap_correct_data;
> - nand->ecc.calculate = omap_calculate_ecc;
> - omap_hwecc_init(nand);
> - printf("HW ECC selected\n");
> + if (hardware) {
> + if (eccstrength == 1) {
> + nand->ecc.mode = NAND_ECC_HW;
> + nand->ecc.layout = &hw_nand_oob;
> + nand->ecc.size = 512;
> + nand->ecc.bytes = 3;
> + nand->ecc.hwctl = omap_enable_hwecc;
> + nand->ecc.correct = omap_correct_data;
> + nand->ecc.calculate = omap_calculate_ecc;
> + omap_hwecc_init(nand);
> + printf("1-bit hamming HW ECC selected\n");
> + }
> #ifdef CONFIG_AM33XX
> - } else if (hardware == 2) {
> - nand->ecc.mode = NAND_ECC_HW;
> - nand->ecc.layout = &hw_bch8_nand_oob;
> - nand->ecc.size = 512;
> - nand->ecc.bytes = 14;
> - nand->ecc.read_page = omap_read_page_bch;
> - nand->ecc.hwctl = omap_enable_ecc_bch;
> - nand->ecc.correct = omap_correct_data_bch;
> - nand->ecc.calculate = omap_calculate_ecc_bch;
> - omap_hwecc_init_bch(nand, NAND_ECC_READ);
> - printf("HW BCH8 selected\n");
> + else if (eccstrength == 8) {
> + nand->ecc.mode = NAND_ECC_HW;
> + nand->ecc.layout = &hw_bch8_nand_oob;
> + nand->ecc.size = 512;
> + nand->ecc.bytes = 14;
> + nand->ecc.read_page = omap_read_page_bch;
> + nand->ecc.hwctl = omap_enable_ecc_bch;
> + nand->ecc.correct = omap_correct_data_bch;
> + nand->ecc.calculate = omap_calculate_ecc_bch;
> + omap_hwecc_init_bch(nand, NAND_ECC_READ);
> + printf("8-bit BCH HW ECC selected\n");
> + }
> #endif
> } else {
> nand->ecc.mode = NAND_ECC_SOFT;
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