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The NAND flash header calculation is incorrect #124
Description
the handle_cmd_initialize fucntion,
The correctability variable is incorrect, causing the header calculation to be incorrect when header==0.
The FMND1G08U3J IC,
■
RELIABILITY
10 0,000 Program / Erase cycles
(with 4 bit/512 Byte ECC)
Correct header is 0xC0902405
BUT,
header = pmecc_get_default_header(correctability);
header = 0xC6908405
/* try reading ONFI data */
if (nand_onfi_device_detect(&nand) && nand_onfi_check_compatibility(&nand)) {
nand_onfi_disable_internal_ecc(&nand);
nand_onfi_get_model(&model_from_onfi);
model = &model_from_onfi;
correctability = nand_onfi_get_ecc_correctability();
if (correctability != 0xff) {
/* ONFI correctability is number of ECC bits per 512 bytes of data */
correctability *= nand_onfi_get_page_size() / 512;
}
}
/* Initialize PMECC */
if (header == 0) {
header = pmecc_get_default_header(correctability);
trace_warning_wp("Using default PMECC configuration\r\n");
}
After I made some corrections, I was able to get the correct values, but the code still felt a little off.
Before:
if (correctability != 0xff) {
After:
if (correctability == 0xff) {
Activity
keyehe commentedon Dec 1, 2025
correctability != 0xff is right. SORRY!