Baremetal 设计说明

Baremetal 源码说明

Baremetal 层次关系

Baremetal 层次关系如下所示：

用户开发项目，在 MTD 层上开发, SPINAND 层上开发可能会破坏 spl、os 分区的数据。

Baremetal 关键流程

• SPI NAND 初始化流程

  mtd_probe //bsp/artinchip/drv_bare/mtd/mtd_probe.c
  |-> spinand_probe(AIC_BOOTLOADER_SPINAND_QSPI_ID); //bsp/artinchip/drv_bare/spinand/spinand_mtd.c
      |-> get_qspi_by_index(spi_bus);   // 获取 bus 对象
      |-> qspi_configure(qspi, NULL);  //bsp/artinchip/drv_bare/spinand/spinand_port.c
          |-> hal_qspi_master_init(&qspi->handle, &cfg);
          |-> hal_qspi_master_dma_config(&qspi->handle, &dmacfg);
          |-> hal_qspi_master_set_bus_freq(&qspi->handle, qspi->bus_hz);
      |-> spinand_flash_init(flash);  //bsp/peripheral/spinand/spinand.c
          |-> spinand_info_read(flash);
          |-> nand_bbt_init(flash);
      |-> part = mtd_parts_parse(NOR_MTD_PARTS); //解析分区信息
      |-> mtd->ops.erase = sfud_mtd_erase;
      |-> mtd->ops.erase = mtd_spinand_erase;
      |-> mtd->ops.block_isbad = mtd_spinand_block_isbad;
      |-> mtd->ops.block_markbad = mtd_spinand_block_markbad;
      |-> mtd->ops.read = mtd_spinand_read;
      |-> mtd->ops.write = mtd_spinand_write;
      |-> mtd->ops.read_oob = mtd_spinand_read_oob;
      |-> mtd->ops.write_oob = mtd_spinand_write_oob;
      |-> mtd->ops.cont_read = mtd_spinand_continuous_read;
      |-> mtd_add_device(mtd);  //添加 mtd 分区

• SPI NAND 读数据流程

  mtd_read //bsp/artinchip/drv_bare/mtd/mtdcore.c
  |-> mtd_spinand_read(struct mtd_dev *mtd, u32 offset, u8 *data, u32 len); //bsp/artinchip/drv_bare/spinand/spinand_mtd.c
      |-> spinand_read(flash, data, start, dolen); //bsp/peripheral/spinand/spinand.c
          |-> spinand_block_isbad(flash, blk);
          |-> spinand_read_page(flash, page, p, flash->info->page_size, NULL, 0);
              |-> spinand_load_page_op(flash, page);
              |-> spinand_read_from_cache_op(flash, column, buf, nbytes);

Baremetal 应用接口设计